Floating body with hull segments made of thermoplastic material and computer program product and use

Abstract

Floating body (10) with bow (1) and stern (3), in particular a watercraft hull, made of thermoplastic material, having a plurality of individual hull segments (11, 13) which, in an interconnected arrangement, define the hull shape of the floating body (10), and having a plurality of stiffening structures (10.2) in a cavity (V) formed by the respective hull segment, which at least partially also form an internal structure stiffening the hull shape; characterized in that the respective hull segment (11, 13) together with the corresponding stiffening structure (10.2) is made of thermoplastic material in one piece, in particular is formed integrally and closed in itself, in particular is produced by rotational molding, wherein one of the hull segments forms a / the bow hull segment (11) or a / the stern hull segment (13) of the floating body (10) and can be connected to at least one further hull segment (11, 12, 13) in at least one hull segment connection plane (E) intersecting the longitudinal axis (X10) or the intended direction of travel, preferably can be connected in a materially bonded circumferential manner, for further developing the floating body (10), in particular in the longitudinal direction or in the direction of travel.

Description

TECHNICAL AREA

[0001] The present invention relates to a floating body with a bow and stern, in particular a watercraft hull, made of thermoplastic material, comprising a plurality of individual hull segments which, in an interconnected arrangement, define the hull shape of the floating body, and comprising a plurality of stiffening structures in a cavity formed by the respective hull segment, which, in particular in the case of interconnected hull segments, also form at least partially an internal structure stiffening the hull shape. Furthermore, the present invention relates to implementation measures for realizing or using a method for manufacturing segments of such a floating body by rotational molding, in particular in the context of preparatory steps for assembling several rotationally molded segments together. The present invention also relates to corresponding control engineering implementations.The present invention also relates to aspects of constructing the entire float by connecting several hull segments to one another. Furthermore, the present invention relates to the use of at least one connecting element embedded in the area of ​​at least one connection / contact surface of adjacent hull segments for permanently connecting the adjacent hull segments to form the shape or contour of the float or to further develop the structurally load-bearing hull shape of the float. In particular, the invention relates to devices and uses according to the preamble of the respective independent claim. BACKGROUND OF THE INVENTION

[0002] The production of boat hulls and similar floating bodies, especially those intended for navigation purposes, with bow and stern, i.e., with a predefined direction of travel or longitudinal axis, from thermoplastics or from correspondingly formable / deformable plastics by rotational molding, offers significant production-related advantages and also cost advantages with regard to the end products. Depending on the intended use, there are also advantages in terms of robustness, durability, and maintenance-free operation of the hull. However, it also brings disadvantages, in particular size limitations, comparatively high weight, comparatively strict shape specifications, and comparatively limited combination / variation possibilities.Floating bodies with a bow and stern should, on the one hand, have a hydrodynamically advantageous underwater hull (wet lateral plane) depending on their intended use, and on the other hand, their design should also allow for the most functional layout possible, especially the deck layout. As the dimensions increase, stiffness becomes increasingly important, which, in the context of the manufacturing method considered here, may become relevant even for floating bodies with absolute dimensions exceeding 5 meters, particularly for wind-powered floating bodies and / or for navigation in waters with relatively strong wave / tidal movements and / or potentially very strong winds – in other words, when the floating body will be subjected to complex dynamic loads during use.

[0003] Advantageous are floating bodies with bow and stern, especially boat hulls, rotationally molded from thermoplastic material, constructed from a double shell enclosing a cavity, which, however, does not have to consist of individual shells that would have to be joined together in the manner of a marriage known from automotive construction (keyword hull-deck connection), as is also classically common in yacht construction, especially in the context of composite laminates such as fiberglass / carbon fiber composite hulls (lower hull section on the one hand, upper hull section or deck on the other), but which, thanks to rotational molding, can be created as an integral double-shell form, which is formed, for example, from at least two mold parts / shells mounted together for the rotational molding process.The thermoplastic material can conform to both negative mold parts during the casting process, then harden, and subsequently be removed by separating the at least two mold parts. A hull-deck connection (or similar transition) known from conventional manufacturing methods is therefore already ensured by rotational molding itself.

[0004] In such a rotational molding process, one negative mold part typically provides the negative mold for the lower part of the hull (lateral plan and freeboard, at least partially), and the other negative mold part typically provides the negative mold for the upper part of the hull (especially the deck). Stability is therefore ensured by the self-contained double hull, preferably in the form of an integral, one-piece double hull without the need for seams, positive / positive connections, or the like. Up to a certain size, this concept may be very advantageous, e.g., for small motorboats, dinghies, recreational sailboats, and kayaks.However, the possibilities regarding aerodynamic shape optimizations, regarding the introduction / exit of comparatively high forces from the rigging or keel, regarding deck layout, or the options for improving stiffness may be somewhat limited, especially since the advantage of the self-contained floating body should not be negated by subsequent drilling, breaking open or similar assembly / installation measures.

[0005] As a result, rotational molding cannot yet be advantageously implemented for ships subjected to comparatively high stress or above certain size dimensions, especially not for hulls with a bow and stern that require a comparatively large and / or deep ballast (particularly a keel or bulb) and / or a comparatively high-performance rig (i.e., at least a tall mast or one designed for a comparatively large sail area). Therefore, the application of rotational molding, especially in hull construction, unfortunately remains limited.

[0006] It is understandable that rotational molding as a manufacturing process has been used for (tank) container construction for many years or decades (especially by casting hollow bodies). However, in this context, less stringent requirements are placed on the structural stiffness of the resulting container or tank, particularly since the latter are used under predefined (primarily static) storage conditions and are not usually intended for floating use in water under hydrodynamic conditions. This contrasts with ship hulls, which, despite a structurally predefined central longitudinal axis or direction of travel, can be subjected to unpredictable hydro- / dynamic load conditions, especially in unknown wave systems. Consequently, correspondingly higher / different requirements must be placed on the structurally achievable strength / stiffness.Tanks and similar containers are not necessarily constructed with a double shell; a single shell may suffice. Furthermore, entirely different types of stress must be considered, such as internal gas pressure. The expert is therefore faced with the task of further developing known rotational molding processes with regard to size scalability and, at the same time, examining whether and in what direction these processes can be further developed with respect to achievable strength / stiffness, particularly in the case of self-contained double-shell molds.

[0007] To better understand the prior art, it should be noted that rotational molding typically requires a design in which either a more or less self-contained tank / container mold is created, or, specifically in the field of boat hull construction, a contoured double shell. In this case, one shell surface is functionally designed for the underside (and possibly parts of the lateral section) of the hull, and the other shell surface is functionally designed for the topside (and possibly parts of the lateral section) of the hull or for the deck. In cross-section (especially in the cross-sectional plane orthogonal to the longitudinal direction), this results in two section lines or a single circumferential section line (depending on whether the double shell is integrally molded in one piece or made from two separate rotationally molded precast parts).

[0008] Finally, it should also be noted that methods exist for duplicating the respective shell surface, particularly for arranging multiple shells within one another using different thermoplastic materials in subsequent, repeated rotational molding processes. For example, an outer shell with particularly high UV resistance and an inner shell with structural strength advantages. This method, however, relies on the design approach of conceiving the float as a structure with a double-shell cross-section, with only two cross-sectional sections or a single circumferential cross-sectional section for each thermoplastic material. With regard to safety, moisture resistance, durability, and other practically relevant aspects of use, it may seem more advantageous to design and manufacture the double shell as an integral, single piece.

[0009] In this respect, the previously known design and rotational molding process variants essentially concern constructive measures for providing structures for the (functional) contouring of the corresponding side of the hull shape, in particular the wetted lateral plan on the one hand (especially with regard to hydrodynamic operating conditions) and the deck layout on the other hand (especially with regard to a specific type of use by users or to other functions that can be realized by means of the floating body).

[0010] For example, publication US 5,397,525 A describes the production of kayak hulls by rotational molding using assembled molded parts. Publication US 7,833,459 B2 also describes a rotational molding manufacturing process for kayaks, but instead of creating a double hull with enclosed volume, the kayak is formed by two rotationally molded shells that are then assembled together.The following publications each describe specific measures, with a more focused approach, to implement specific advantages based on the general concept of rotational molding: KR 102014 / 137186 ​​A describes measures for optimizing heat transfer phenomena in the rotational molding of comparatively large-volume hulls; CN 114986768 A describes measures for stabilizing the bonding of inner surfaces of an inner shell arranged within an outer shell of a rotationally molded hull; US 2025 / 073962 A1 describes measures for combining foam and composite materials in rotationally molded hulls.

[0011] Based on this, there is interest in an improved design of floating bodies or (ship) hulls in the context of rotational molding processes and in the design features of floating bodies with bow and stern, especially ship hulls, particularly with regard to downstream process steps following rotational molding itself. Based on the current state of the art, there is also a need for measures that enable scaling to larger sizes / volumes as well as improved structural stiffness. Finally, there is also interest, particularly with regard to process-related manufacturing aspects, in solutions that allow for the greatest possible variety, both in terms of the shape of the floating body itself and in terms of structural features, e.g., concerning specific load conditions, especially for sailboats. SUMMARY OF THE INVENTION

[0012] The task is to provide a float with a bow and stern made of thermoplastic material, as well as implementation measures for realizing or at least utilizing a process for its manufacture based on rotational molding. This will ensure, on the one hand, an advantageous configuration or quality of the outer shape or contour, and on the other hand, particularly good structural properties, especially when scaling up in size. Furthermore, the task is to design such a float in such a way that the creation of a structurally strong / stiff float can be implemented in a particularly flexible and versatile manner in terms of processes and manufacturing technology.Last but not least, it is a task to design such a floating body in such a way that, on the one hand, the created floating body as such, and on the other hand, installations / superstructures / additions can be realized in a particularly advantageous way, especially with regard to structural properties, and also with regard to scaling to larger dimensions.

[0013] This problem is solved by a float according to claim 1, by implementation measures for realizing or at least using a rotational molding process for this purpose, and by uses according to the dependent use claim. Advantageous embodiments of the invention are explained in the respective dependent claims. The features of the exemplary embodiments described below can be combined with one another unless explicitly stated otherwise.

[0014] A floating body with bow and stern, in particular a watercraft hull, made of thermoplastic material, is provided, comprising a plurality of individual hull segments which, in an interconnected or mounted arrangement, define the hull shape of the floating body, and comprising a plurality of stiffening structures in a cavity formed / enclosed / delimited by the respective hull segment, which, in particular, when interconnected or mounted together,The hull segments mounted one another also form at least partially an internal structure that stiffens the hull shape; according to the invention, it is proposed that the respective hull segment together with the corresponding stiffening structure is integrally made of thermoplastic material in one piece, in particular is formed integrally as a closed whole (preferably a single-walled hull segment shell in the form of a double shell with outer and inner hull shell), in particular is produced by rotational molding, wherein one of the hull segments forms a bow hull segment or a stern hull segment of the floating body and is connectable / connected to at least one further hull segment in at least one hull segment connection plane that intersects the (central) longitudinal axis or the intended direction of travel, preferably is connectable / connected circumferentially by a material bond, for the further development of the floating body, in particular in the (central) longitudinal direction or in the direction of travel.This, on the one hand, promotes the use of advantageous manufacturing processes, in particular rotational molding processes, and on the other hand, a concept for the comparatively simple optimization of the structural properties of the float body as well as for comparatively simple size scaling can be provided.

[0015] The term "hull" refers in particular to a ship's body without mast(s), superstructure, attachments, and / or interior fittings. A "hull segment" refers to a part of the structure forming the hull. It is understood that the concept according to the invention makes it possible to provide at least a part of an interior fitting structure, at least insofar as it can / should be assigned a structurally stiffening function, for example, interior fitting structure components to which further attachments or interior fittings such as doors, kitchen equipment, and sanitary facilities can be mounted.

[0016] Thermoplastics can include, in particular, plastics such as polyolefins, e.g., PP (polypropylene), especially PE-HD (HDPE, high density polyethylene), or PE (polyethylene).

[0017] Insofar as the present disclosure refers to bow hull segment or stern hull segment, these are synonymous with a hull segment that is foremost or rearmost in the direction of travel, i.e., a hull segment with a tapered shape towards a bow tip or a stern, or at least in the case of the stern hull segment having a stern end face.

[0018] Where the present disclosure refers to a further hull segment, this is to be understood synonymously as a hull segment located behind the foremost hull segment and in front of the rearmost hull segment when viewed in the direction of travel; such a hull segment does not necessarily have a tapered contour of the outer shell (i.e., it is not necessarily streamlined); for example, in the case of floating bodies that are mainly or essentially exclusively powered by motors, it may be of interest to implement a length scaling based on comparatively short bow and stern hull segments in combination with a plurality of further hull segments arranged longitudinally between them.

[0019] The term "internal structure" refers in particular to a structure enclosed by the respective hull segment or its shell, which does not form the outer contour, outer shell, or outer surface of the hull segment, but is provided internally, in particular on an inner surface or in a storage or living space or usable volume formed by the hull segment, or is designed in the manner of a (stiffening, reinforcing) structure projecting into the interior space formed by the hull segment as intended.

[0020] Where the present disclosure refers to (negative) mold parts required for rotational casting, this is to be understood synonymously as a negative mold or shell provided for the respective hull segment, i.e., a reference to the system provided for rotational casting and corresponding negative molds designed for this purpose. These negative mold parts are also referred to here as rotational casting mold parts.

[0021] Where the present disclosure refers to parts produced by rotational molding, also referred to herein as finished parts, this means the corresponding rotationally molded hull segment, i.e. the segment of the floating body produced according to the method described herein, intended to form the entire floating body together with at least one further part or hull segment produced by rotational molding.

[0022] Where the present disclosure refers to a cavity enclosed by the corresponding hull segment, this is to be understood synonymously as a living, utility, or storage space. In contrast, the term "cavity volume" here refers to the volume enclosed by the double shell of the respective rotationally molded hull segment, which preferably remains hermetically sealed from the environment (at least with regard to the sections of the floating body's shape that are intended to be wetted / wettable by water).

[0023] Where the present disclosure refers to a connection, this is to be understood synonymously as a connection between at least two hull segments, including, in particular, a connection comprising several types of connection, e.g., material connection, form connection, and / or force connection. Where the present disclosure refers to a fastening, this is to be understood synonymously as a connection to fastenings made to at least one hull segment by means of fasteners, e.g., for interior fittings, rigging components, or keel components, including, for example, rivet / bolt connections, clamp connections, and the like.

[0024] Personalized terms, unless explicitly formulated in the neuter form, may refer to all genders within the scope of this disclosure. Any foreign-language expressions or abbreviations used here are standard industry terms and are familiar to those skilled in the art. Any synonymous German terms may be indicated here in parentheses for the sake of completeness, or vice versa, for example, regarding the term high-density polyethylene (HDPE).

[0025] In other words, according to the prior art, the possibilities for manufacturing floating bodies, especially boats, from thermoplastics, particularly HDPE, in sizes exceeding five meters are insufficient based on existing production facilities and processes. It is technically impossible, at a reasonable cost, to provide structurally sufficiently rigid and, ideally, also comparatively large floating bodies, especially ship hulls, made of thermoplastic material. Furthermore, the resulting hollow hull is typically produced as a single shell, particularly since a shaping core cannot usually be easily removed after the hollow hull has been manufactured. In contrast, the present invention is also based on the concept of producing the floating body, e.g.,to divide a boat hull, including deck structure, longitudinally into several segments, each of which can be produced by rotational molding and subsequently connected to each other in a static / dynamic load-bearing and advantageously also watertight manner, in particular at least by welding adjacent segments of surface sections brought together for attachment, optionally also by welding any joints that may form from the outside and optionally also from the inside, wherein optionally further types of connection may be implemented, wherein tension-acting clamping devices may also be implemented after rotational molding for the purpose of even higher strength of the produced floating body.This allows for the creation of a floating structure, particularly a boat hull (optionally including interior fittings), based on double-shell hull segments made of thermoplastic material, especially HDPE, while also incorporating a high capacity to bear static loads. The hollow volumes enclosed by the segments can optionally be filled with foam for improved rigidity and thermal and acoustic insulation. In this way, thanks to the optimized production process described here, sustainable, safe, and cost-effective floating structures, boats, and ship hulls, including deck layouts, can be provided, which can also be optimized to meet the requirements of unsinkability.

[0026] According to one embodiment, adjacent fuselage segments in the area of ​​the fuselage segment shell and / or in the area of ​​the stiffening internal structure and / or in the area of ​​connection / contact surfaces, in particular end-face connection / contact surfaces, can be connected or mounted to one another by at least one of the following connections: thermoplastic connection (in particular welded connection), positive / force-fit connections, tension connections with tensile force applied over several fuselage segments. This also facilitates the implementation of the concept of connecting several fuselage segments together with the concept of providing not only stiffening but also advantageously usable (internal) structures. Advantageously, a material-bonded thermoplastic connection is provided, preferably circumferentially, and the thermoplastic connection is advantageously supplemented by at least one of the other connection types.This can further increase robustness and safety.

[0027] According to one embodiment, stiffening structures of adjacent fuselage segments are / are at least partially integrally and integrally connected to one another in the at least one fuselage segment connection plane, e.g., by thermoplastic joining processes, especially by welding. This provides a particularly good compromise with regard to tightness, load-bearing capacity, the region of force application, and also with regard to accessibility for the joining process. Advantageously, for this purpose of material-bonded planar joining, a linear or mat-like heat input element is provided on at least one of two adjacent fuselage segments or embedded in the fuselage segment, in particular created during the rotational molding process.

[0028] The term "adjacent hull segments" refers to hull segments that are intended to be adjacent to one another, i.e., hull segments that are designed in such a way that they can be connected to each other in pairs in a joining process, in order to form or further develop the hull or the contour of the floating body.

[0029] According to one embodiment, adjacent fuselage segments can be connected to one another at connection / contact surface sections or areas in at least one fuselage segment connection plane that intersects the longitudinal axis or the intended direction of travel, preferably by means of a continuous, material-bonded connection, wherein the connection / contact surface sections or areas are at least partially formed by the stiffening structure. This can further improve the variability with regard to the size and also with regard to the (radial) position of the available / usable connection / contact surface sections or areas, and can therefore contribute to an improvement in the structural properties, particularly thanks to good (large-area) force distribution and force transmission in the area of ​​the fuselage segment connection plane(s), relatively independent of a specific fuselage shape or similar boundary conditions.

[0030] According to one embodiment, connecting / contact surface sections of adjacent hull segments are at least partially arranged end-to-end and axially butt against each other (as intended, i.e., in the assembled arrangement of the hull segments), in particular connecting / contact surface sections as an integral component of a thermoplastic double shell of the respective hull segment. This also facilitates the constructive implementation of a comparatively stable, structurally significant annular transverse bulkhead section, preferably for the complete absorption / transmission of forces.

[0031] According to one embodiment, one of the hull segments forms the bow hull segment and one of the hull segments forms the stern hull segment, each manufactured by rotational molding and consisting of a hull segment shell with an outer hull shell and an inner shell, wherein the bow hull segment and / or the stern hull segment are manufactured / manufacturable by means of (at least) a first rotational molding part defining the outer hull shell and by means of (at least) a second rotational molding part defining the inner shell, wherein the (at least one) first and second rotational molding part can be assembled together for rotational molding and can be disassembled from each other for removal of the rotationally molded hull segment, in particular detachable with the first rotational molding part in the longitudinal direction at the bow side relative to the hull segment and detachable with the second rotational molding part in the longitudinal direction at the stern side relative to the hull segment.This also facilitates a comparatively simple design of the outer hull contour on the one hand and the inner hull contour on the other, in combination with the possibility of providing a comparatively large and radially maximally external connection / contact surface in a connection plane preferably orthogonal to the central longitudinal axis or the intended direction of travel.

[0032] According to one embodiment, at least two of the hull segments, including at least one bow and one stern hull segment, are segments that can be installed longitudinally on the float, particularly with cutting planes at least approximately orthogonal to the longitudinal axis or the intended direction of travel of the float. This also facilitates the design of very stiff / robust bow and stern hull segments such that they can be connected to each other as well as optionally to at least one further hull segment structurally located longitudinally between them, in each case with a comparatively large achievable contact / connection area, especially for hull segments connected in pairs.

[0033] According to one embodiment, the respective fuselage segment limits the formed cavity (or the usable interior space of the fuselage shape) at least laterally / radially by means of a double shell. This promotes high stability on the one hand, and on the other hand provides an insulating effect and also a kind of buffer zone for deformations, e.g., in the event of minor accidents or contact with other bodies.

[0034] According to one embodiment, the bow hull segment and / or the stern hull segment delimits or encloses the formed cavity both laterally / radially and in the intended direction of travel, forwards or afts, by means of a double shell. This provides, on the one hand, high rigidity and watertightness. On the other hand, the bow hull segment and / or the stern hull segment can each be provided with highly effective stiffening structures on the inside of one or more inner shells, for example, cascading radial structures extending outwards towards the longitudinal center of the hull. These structures allow for varying degrees of space for any desired internal fittings, depending on the requirements, and may also provide mounting structures for them.Particularly advantageous is the ability to connect adjacent, especially end-face, connecting / contact surfaces of intended neighboring fuselage segments in a comparatively robust and structurally rigid manner, especially completely circumferentially and advantageously also hermetically sealed.

[0035] According to one embodiment, at least two of the hull segments connected as intended, including at least one of the bow and stern hull segments, have at least one stiffening (internal) structure in a cross-sectional plane at least approximately orthogonal to the longitudinal axis or intended direction of travel of the floating body, which at least partially forms a bulkhead that subdivides and stiffens a / the cavity formed / enclosed by the connected hull segments in the plane at least approximately orthogonal to the longitudinal axis.Such a configuration offers advantages, particularly in the context of stiffness requirements for wind-powered floating structures, with regard to load-bearing capacity in all three spatial dimensions. This is especially true in the form of transverse bulkheads familiar from classic yacht construction, which extend at least partially through the interior or the cavity enclosed by the hull segment at successive length positions every few meters along the central longitudinal axis. Furthermore, the implementation of mast and rigging structures and / or keel attachments can be facilitated or even made possible in the first place.

[0036] According to one embodiment, at least one of the hull segments provides a stiffening (internal) structure comprising at least one two- or three-dimensional structure from the following group: step transverse to the longitudinal axis, edge, projection, step, bulge, optionally recurring from the center inside to the radial outside and / or circumferentially, in particular around the (central) longitudinal axis. These types of structures can be selected according to their relative position on the float or the corresponding hull segment with regard to the respective loads acting in this area, and their size, density, distribution, orientation, and similar parameters can also be specified.Advantageously, the structures are reflected on the cutting / connection planes of adjacent hull segments, preferably congruently at least directly in the area of ​​connecting / contact surface sections or areas of adjacent hull segments.

[0037] According to one embodiment, at least the bow hull segment and / or at least the stern hull segment has at least one connecting element, in particular a heat input element, advantageously provided over the entire circumference of the hull segment connection plane, and advantageously comprising at least one linear or mat-like heat input element (preferably at least one heating wire), configured for material bonding of the thermoplastic material, wherein at least the bow hull segment and / or at least the stern hull segment is configured to be / become materially bonded to at least one further hull segment by heat input, in particular to at least one further hull segment between the bow and stern hull segments.This also significantly simplifies the joining process for the hull segments that follows rotational molding. Furthermore, a comparatively large joining surface can be utilized (especially radially at its outermost point), thus ensuring good force distribution for the intended loads during use of the float.

[0038] The at least one connecting element, in particular a heat-injection element, enables and facilitates, not least from a process perspective, the joining of at least two hull segments, and optionally also the fastening of any further components, particularly with regard to access to the respective connection / fastening area. By means of the at least one heat-injection element, a material bond can advantageously be established / ensured in a simple manner, especially also completely on circumferential connection / contact surfaces. Optionally, form-fit / force-fit connecting elements such as screw and / or rivet connections can also be provided in the respective hull segment connection planes, especially radially inside a material-bonded connection area. This can also ensure optimization with regard to both tightness and strength / stiffness.

[0039] It is understood that interlocking form-fitting contours can also be provided at the connection / contact surfaces of adjacent hull segments, particularly in the areas occupied by the at least one heat input medium. Examples include: plug-and-socket, tongue-and-groove, male-female, pin- or bolt-like connections, tube-in-tube connections, or cylindrical sections in combination with blind-hole sections. The corresponding rotationally molded negative molds can define the appropriate geometry. Advantageously, these interlocking form-fitting contours can also be designed to project / extend or be recessed in the axial direction, especially since the design concept described here allows the rotationally molded negative molds to be demolded longitudinally (towards the bow or stern).In this way, the connection between adjacent fuselage segments can be made even more robust and durable, particularly thanks to material bonding even in areas that would be difficult to access without the embedded heat transfer agents described here. For example, interlocking male-female interlocking contours are provided at three, four, or more circumferential positions on the end faces of adjacent fuselage segments. This facilitates the positioning of the fuselage segments relative to each other during the manufacturing process for the entire fuselage. For example, only the respective female interlocking contour is provided with a heat transfer agent, which advantageously prevents the male interlocking contour from being reshaped during softening or curing.Tempering of the thermoplastic material is favored, thus promoting a comparatively homogeneous and large material-bonded connection surface.

[0040] The connecting / contact surfaces advantageously have a comparatively large end face for butt joints. This also promotes a stabilizing effect similar to a transverse bulkhead. The connecting / contact surfaces can advantageously also have axially overlapping or interlocking surface sections, at least in some sections, particularly in a tube-like manner. This can add a further dimension of stability / stabilization, especially since the connection can also be ensured in other planes / spatial directions, which is also advantageous with regard to potentially very high dynamic loads, especially those of sailing vessels operating in heavy seas. The axially overlapping design can also facilitate the positioning of the hull segments relative to each other (during construction). It is advantageous, at least circumferentially specific, e.g.In individual circumferential segments, a combination of end faces and axially overlapping sections is provided, particularly for the purpose of maximizing stability.

[0041] Advantageously, the at least one connecting element, in particular the heat input element, comprises at least one linear or mat-like heat input element, preferably at least one heating wire. The at least one linear or mat-like heat input element can, for example, be provided at each connection / contact surface of adjacent hull segments and can, for example, be implemented in a location-specific manner with regard to density, course, and / or material thickness such that the heat input ensures a temporal sequence or an even or uneven distribution of heat input as intended. This facilitates, not least, an application-specific implementation of the method of connecting adjacent hull segments.Based on the present disclosure, the person skilled in the art can specify how the corresponding connecting means, in particular the heat input means or heat input element, is to be designed and implemented, or how the heat input is to be realized, in order to create a connection between at least two hull segments as intended. Thus, three or more hull segments can also be connected to one another, either longitudinally at least three hull segments (bow and stern hull segments and at least one further hull segment), or longitudinally at least two hull segments (bow and stern hull segments) in combination with at least one further hull segment.The person skilled in the art can specify whether the interconnected hull segments follow each other exclusively in the longitudinal direction, each forming a section of the outer contour of the hull shape / shell, or whether several (further) hull segments are also to be connected in the transverse plane in at least one spatial direction.

[0042] The at least one further hull segment between the bow and stern hull segments does not necessarily have a tapering of the outer hull contour, e.g. a middle hull segment of a floating body that is mainly or essentially exclusively motor-driven.

[0043] According to one embodiment, at least two of the fuselage segments are connected to each other in a further fuselage segment connection plane oriented parallel to the (central) longitudinal axis or direction of travel, or can be connected accordingly, particularly central fuselage segments without a tapering of the fuselage shell's shape. In other words, the concept of end-face connection of adjacent fuselage segments described here can optionally be extended, particularly for further fuselage segments, by at least one further connection plane with a different spatial orientation. This can also contribute positively to improved three-dimensional structural properties.

[0044] According to one embodiment, at least two of the hull segments, which are or are to be connected, each form part of a mast fitting and / or a keel fitting, in particular by providing one of two areas of the respective fitting on opposite ends. This also facilitates the integration of a rig, i.e., at least one mast (for example, a freestanding and / or rotating mast) and, if applicable, other associated components such as rigging or the like, in a comparatively simple, robust, and structurally optimized manner. For example, the fitting extends into the area of ​​a keel or at least into the area of ​​a bottom structure or keel fitting structure of the hull, so that the rigging forces can be introduced relatively low into the hull.

[0045] According to one embodiment, the hollow volume formed by at least one of the hull segments and enclosed by the double shell is at least partially filled with foam or fitted with prefabricated foam components. This can further improve stability and structural stiffness, particularly in selected volume areas, for example, where the highest stresses or deformations are expected.

[0046] The aforementioned problem is also solved by implementation measures for realizing a method according to the present disclosure, namely by a computer program product comprising instructions which, when the computer program product is executed on a computer, cause the computer to perform steps for controlling a method for manufacturing a floating body, in particular a watercraft hull, having a bow and stern, from thermoplastic material, comprising the steps of: creating a plurality of individual hull segments of the floating body defining the hull shape of the floating body; creating at least one stiffening structure in at least two of the hull segments in a cavity formed by the hull segment such that stiffening structures of adjacent interconnected hull segments also form at least a portion of an internal structure stiffening the hull shape;wherein the creation of the respective hull segment is carried out by rotational molding and comprises the creation of a bow hull segment or a stern hull segment, wherein the rotational molding also forms at least one stiffening structure integrally and in one piece from thermoplastic material such that adjacent hull segments can be connected to each other at connection / contact surface areas in at least one hull segment connection plane intersecting the longitudinal axis or the intended direction of travel, preferably by means of a material-bonded circumferential connection, wherein the connection / contact surface areas are at least partially formed by the stiffening structure;especially for the production of the floating body described here. This results in the aforementioned advantages, particularly with regard to high process variability and high design variability, high structural stiffness with respect to load-bearing rotationally cast structural sections, also for the transfer of forces / moments that are caused, for example, by rigging and / or keel (or rudder, rudder shaft) or the like, appendages that project significantly above or below the hull vertically with comparatively large loads / stresses.

[0047] It is understood that the implementation of AI models within the scope of the present invention, particularly in the context of individual steps of the manufacturing process described herein, especially in the context of connecting means and during the joining of at least two hull segments monitored parameters (e.g. voltage, current, temperature), may include a computer infrastructure or data processing architecture, particularly in the core of at least one computing unit, which facilitates and / or makes more powerful or faster (up to real-time processing) and / or makes more energy-efficient, or at least partially enables the execution of ML algorithms directly in / on the hardware.In this context, decision-making processes of neural AI networks can be implemented relatively quickly and energy-efficiently, particularly in end devices (edge ​​devices), such as wirelessly communicating sensors, which may be implemented in the context of the process steps described here, especially in the context of at least one step for connecting hull segments. For example, a process for creating a material-bonded connection may be optimized in this way. AI models may also be implemented or used in the constructive design of the hull shape and / or the type and design of the structures described here and / or the arrangement and orientation of the connections described here.For example, the computer-based and chip-based tools described here include at least one of the following components: photonic AI chips, particularly those with silicon photonic structures (a combination of electronic and optical data processing), optical waveguides at least partially replacing or supplementing electronic semiconductors, as well as multiplexing components, photon modulators, photodetectors, ring resonators, at least one dense wavelength division multiplexing (DWDM) component for the simultaneous processing of multiple data channels, at least one optical circuit integrated into at least one neural network (NN) or deep neural network (DNN), at least one photonic processor, and / or similar components. For example, at least one NN and / or DNN is executed directly at the hardware level. As a result, particularly large datasets can be analyzed very quickly.For example, at least one photonic component is present in form printed directly onto a wafer, in particular at least one of the following photonic components: optical amplifiers, photonic circuits (PICs), polarization converters, splitters, optical waveguides, splitters, phase modulators.

[0048] According to one embodiment, adjacent fuselage segments are connected to one another in the area of ​​the fuselage segment shell and / or in the area of ​​the stiffening internal structure and / or in the area of ​​connection / contact surfaces by at least one of the following connections, in particular by means of fasteners: thermoplastic connection, form-fit / force-fit connections, tension connections with tensile force applied over several fuselage segments. The present invention also favors, both in terms of design and process, a combination of several of these connection types, in particular material bonding in combination with at least one further connection type or at least one further type of fastener.

[0049] According to one embodiment, stiffening structures of adjacent hull segments are at least partially integrally and integrally connected to one another, particularly in the at least one hull segment connection plane, e.g., by thermoplastic joining processes, especially by welding. This can optimize both stiffness and tightness, particularly in the region of a radially outermost circumferential line or surface, and especially in a plane of action corresponding to a transverse bulkhead at least approximately orthogonal to the longitudinal axis.

[0050] According to one embodiment, adjacent fuselage segments are connected to one another at connection / contact surface areas in at least one fuselage segment connection plane that intersects the longitudinal axis or the intended direction of travel, preferably by a continuous, material-bonded connection, wherein the connection / contact surface areas are at least partially formed by the stiffening structure. This also promotes high structural stiffness thanks to the advantageous force flow and transmission between the fuselage shell on the one hand and the stiffening (internal) structures on the other.

[0051] For example, at least two of the hull segments, which are intended to be mounted or connected to one another, each have at least one stiffening structure formed, which is integrally and integrally connected to the adjacent stiffening structure, e.g. by thermoplastic joining processes, in particular by welding, optionally also by positive-locking or force-locking connections. Connecting means provided for this purpose can, for example, include heat-inducing elements.

[0052] According to one embodiment, one of the hull segments forms the bow hull segment and one of the hull segments forms the stern hull segment, each manufactured by rotational molding and consisting of a hull segment shell with an outer hull shell and an inner shell, wherein the bow hull segment and / or the stern hull segment are manufactured by means of a first rotationally molded part defining the outer hull shell and a second rotationally molded part defining the inner shell, wherein the first and second rotationally molded parts are assembled together for rotational molding and are disassembled from each other for removal of the rotationally molded hull segment, in particular with the first rotationally molded part being detachable longitudinally (i.e., axially) at the bow end relative to the hull segment and with the second rotationally molded part being detachable longitudinally at the stern end relative to the hull segment. This enables orOn the one hand, this facilitates structural optimization of the outer shell, especially the bow hull segment; on the other hand, adjacent hull segments can be equipped with interlocking form-fitting contours in a comparatively simple manner, especially on sections of the double hull that are intended to butt against each other.

[0053] According to one embodiment, in rotational molding, a first and second (rotational molding) negative mold part form a first and second end face of the corresponding hull segment, each corresponding to at least one first and second cross-sectional plane that intersects the longitudinal axis or intended direction of travel of the float at an angle of at least 45°, or preferably is oriented at least approximately orthogonally to the longitudinal axis or intended direction of travel of the float. This also facilitates (size) scaling of a hull shape without significant disadvantages regarding structural stiffness, particularly since the respective (rotational molding) negative mold part can also provide interlocking contours on the adjacent surface areas, enabling the hull segments to be joined together even more stably to form the entire float or hull.It should be understood that the respective negative mold part may have negative contours and / or positive contours corresponding to the desired interlocking contours; for example, a first or second negative mold part intended for a bow hull segment has negative contours (e.g., cylindrical blind holes corresponding to pin- or bolt-like axially projecting interlocking contours on the produced hull segment), and a first or second negative mold part intended for a stern hull segment has geometrically corresponding positive contours (e.g., pin- or bolt-like or tube-like sections corresponding to axial cylindrical blind holes on the produced hull segment).

[0054] According to one embodiment, at least two of the hull segments, including at least one bow and one stern hull segment, are installed longitudinally along the float, particularly with cutting planes at least approximately orthogonal to the longitudinal axis or intended direction of travel of the float. This also facilitates length scaling, especially by means of at least one further hull segment installed axially between the bow and stern hull segments.

[0055] According to one embodiment, at least two of the hull segments connected as intended, including at least one of the bow and stern hull segments, have at least one stiffening structure in a cross-sectional plane at least approximately orthogonal to the longitudinal axis (or orthogonal to the intended direction of travel) of the floating body. This stiffening structure at least partially forms a (transverse) bulkhead, which subdivides and stiffens a cavity formed or enclosed by the connected hull segments in the plane at least approximately orthogonal to the longitudinal axis. This also facilitates the implementation of an effective stabilizing measure at several longitudinal points along the longitudinal axis of the floating body, advantageously a fully effective connection in the form of an annular transverse bulkhead, e.g., every three, four, five, or six meters in the longitudinal direction.It is understood that an advantageous design consists of selecting the radial extent of the respective section of the bulkhead (e.g., on the port and starboard sides, and / or at the top and bottom of the hull) in accordance with the desired thickness of the double hull. In other words, the double hull or float (or the volume enclosed by the double hull) can be dimensioned with sufficient radial thickness such that the resulting radial cross-sectional area is large enough to provide a comparatively large connecting surface, thereby achieving a stabilizing effect comparable to that of a bulkhead known from conventional shipbuilding (e.g., those made of composite materials such as fiber-reinforced composites).In this way, stability concepts from classic yacht building can be adopted and implemented using rotationally molded hull segments that are advantageously joined together. For example, the connection plane of adjacent hull segments is provided in the area of ​​a mast position and / or in the area of ​​chainplates (or so-called chainplates) for attaching the rigging and / or in the area of ​​a keel anchorage. This also facilitates the structural optimization not only of the hull segments in their interaction with each other, but also of the hull segments with regard to forces and moments introduced by the rigging and / or keel attachments.

[0056] According to one embodiment, at least one of the hull segments provides a stiffening structure comprising at least one two- or three-dimensional structure from the following group: step transverse to the longitudinal axis, edge, projection, step, bulge, optionally recurring from the center inside to the radial outside and / or circumferentially, in particular around the longitudinal axis. This provides an even better compromise between material usage, structural advantages, effort minimization, cost / weight advantages, and durability. Such two- or three-dimensional structures are advantageously implemented geometrically such that the at least two negative mold parts usable for creating a respective hull segment can be separated from each other axially towards the bow and stern.For the disassembly of the negative molded parts after rotational molding, a person skilled in the art can use common measures and methods to facilitate the removal of the respective rotationally molded hull segment. Depending on the design constraints for the respective hull shape and the desired use of the float, a person skilled in the art can specify which type of two- or three-dimensional structure can be most effectively implemented in which longitudinal or radial positional area of ​​the float.

[0057] It should be understood that the structures described here may also feature axially projecting extensions or similar features integrally connected to the actual (double-hull) structure. Interior fittings or similar equipment can be mounted to these material tabs, for example, using rivets or screws. These material tabs can transition into a single-walled design, acting as a fastening / connection section that can be individually fitted with additional connectors and / or fasteners such as holes or similar features without disrupting the hollow volume enclosed by the double hull. This also contributes significantly to the high safety of the buoyancy (keyword: potential unsinkability).

[0058] According to one embodiment, at least the bow hull segment and / or at least the stern hull segment has at least one connecting element, in particular a heat input element, advantageously extending over the entire circumference of the hull segment connection plane or at corresponding connection / contact surface sections for the hull segment connection, which is advantageously provided over the entire circumference of the hull segment connection plane and advantageously comprises at least one linear or mat-like heat input element, designed for material bonding of the thermoplastic material, wherein a material bond is achieved or brought about by heat input via the at least one connecting element, in particular via a current / voltage control or regulation.This, not least, facilitates a very selective specification of the type of connection and also of the local connection areas, so that the constructive design can also be simplified in that predefinable force flow paths can be implemented.

[0059] According to one embodiment, at least two of the hull segments are connected to each other in a further hull segment connection plane oriented parallel to the longitudinal axis or direction of travel, in particular central hull segments without a tapering of the hull shape. In other words, the concept described here, which involves providing at least one integral bow and one integral stern hull segment using thermoplastic materials, preferably axially butted together, can be extended to include further hull segments that can also be connected to each other in other connection planes, e.g., in the case of comparatively large floating bodies or ship hulls with a structurally predetermined, comparatively high number of hull segments. This variability facilitates, not least, application-specific implementation based on the degrees of freedom outlined here.

[0060] According to one embodiment, at least two of the hull segments, which are intended to be connected or are to be connected, each form part of a mast fitting and / or a keel fitting by providing one of two areas of the respective fitting on opposite ends. This increases the functional depth or enables a more profound functional integration of the range of functions into the integral, one-piece hull segments that are mounted together or can also be joined together by a material bond.In other words, with regard to the construction of floating bodies designed as hulls for sailing ships with masts and / or for boats with comparatively large ballast or deep draft, the axial segmentation concept described here (i.e., providing at least an integral bow hull segment and an integral stern hull segment) offers the advantage that, through at least one advantageously orthogonal connection plane to the longitudinal axis, in conjunction with the end-face abutment of adjacent hull segments, receptacles can be formed through which comparatively large loads can be absorbed and dissipated, particularly in the area of ​​ring-shaped transverse bulkheads, integrally provided by axially mounted hull segments.

[0061] According to one embodiment, the hollow volume formed by at least one of the hull segments and enclosed by the double hull is at least partially filled with foam or fitted with prefabricated foam components. This can, for example, further increase the safety level, e.g., with regard to the amount of water that might penetrate in the event of a leak. In other words, dead space or dead volume can be at least partially filled with foam or similar buoyancy-enhancing filling material, particularly in the area of ​​a floor assembly. This also improves stability and, for example, the accessibility or usability of floor surfaces as storage areas, especially since pressure peaks can be advantageously absorbed at least partially across the entire surface by the filling material.Therefore, the design can also be optimized by reducing the wall thickness of the integral thermoplastic material, in combination with the use of filling medium, foam or similar molded parts, which in themselves can also have a stiffening effect, at least against compressive forces.

[0062] The aforementioned problem is also solved by a floating body with a bow and stern, in particular by a watercraft hull made of thermoplastic material, manufactured by a method according to the present disclosure. This allows the aforementioned advantages to be realized, especially with regard to high stiffness, good process variability, and scaling possibilities. The floating body with bow and stern is advantageously characterized by integral one-piece double-hull segments, which are at least partially bonded to one another in at least one connection plane intersecting the longitudinal axis, e.g., orthogonally. Advantageously, the bonded connection is also created at least partially on an end face section of the double hull, i.e., on two end face sections of an integral one-piece double hull brought together.

[0063] The aforementioned problem is also solved by a computer program product comprising instructions which, when executed on a computer, cause the computer to perform steps for controlling / regulating a method for manufacturing a floating body having a bow and stern according to the present disclosure on the computer or in a functionally designed control / regulation unit, in particular comprising a computer program product configured for controlling / regulating the manner of rotational molding for creating a bow hull segment or a stern hull segment of the floating body, wherein at least one stiffening structure of the corresponding hull segment is formed integrally in one piece from thermoplastic material such that adjacent hull segments can be connected to one another at connection / contact surface areas formed at least partially by the stiffening structure.wherein the computer program product is preferably also configured to control / regulate the manner of heat input by means of at least one connecting means, in particular a heat input means, especially via current / voltage control or regulation, for the material-bonded joining of adjacent hull segments comprising at least one bow hull segment and / or one stern hull segment, following rotational molding. Based on the aforementioned advantages, this also enables the targeted implementation of a design concept in a process comprising rotational molding and downstream steps.

[0064] The aforementioned problem is also solved by using a plurality of rotationally molded parts in the rotational molding of hull segments from thermoplastic material to form a floating body, in particular a watercraft hull, wherein at least one bow hull segment and optionally also a stern hull segment and / or further hull segments arranged / to be arranged between bow and stern are rotationally molded, wherein the bow hull segment is produced by means of a first rotationally molded part defining the outer hull shell in the bow area and a second rotationally molded part defining the inner shell of the bow hull segment, wherein the first and second rotationally molded parts can be assembled together for rotational molding and can be disassembled from each other for the removal of the rotationally molded bow hull segment.in particular, the first rotationally molded part is detachable longitudinally at the bow side relative to the hull segment, and the second rotationally molded part is detachable longitudinally at the stern side relative to the hull segment, wherein the second rotationally molded part also defines at least a portion of an internal structure stiffening the hull shape; in particular, in the manufacture of a floating body according to the present disclosure; in particular, in a rotational molding process comprising steps according to the present disclosure. This allows the aforementioned advantages to be realized, in particular with regard to good synergies in the context of molded parts, stiffness, size requirements, scalability, variability with regard to stiffening structures, and with regard to connections linking the hull segments together.

[0065] The aforementioned problem is also solved by using at least one connecting element, in particular a heat input element, embedded in the area of ​​at least one connection / contact surface of a rotationally molded hull segment for the material-bonded joining of rotationally molded hull segments made of thermoplastic material by heat input in the area of ​​connection / contact surfaces of hull segments that are intended to be adjacent to one another, comprising at least one bow hull segment and / or one stern hull segment, preferably with the at least one connecting element embedded over the entire circumference of the respective hull segment, wherein the at least one connecting element advantageously comprises at least one linear or mat-like heat input element, preferably at least one heating wire; in particular in the manufacture of a floating body according to the present disclosure;particularly following a rotational molding process, comprising steps according to the present disclosure. This allows the aforementioned advantages to be realized, especially with regard to further process optimizations for the production or completion of a floating body such as a ship's hull from rotationally molded hull segments.

[0066] It is understood that, based on the present disclosure, a person skilled in the art can conduct investigations and further developments to optimize the design of rotationally molded parts, their application, material selection, and the arrangement and orientation of connection / contact surfaces. This includes, in particular, experimental investigations, for example, regarding the structural effects of different types, arrangements, and orientations of (internal) structures and / or different types of connections between adjacent hull segments. In doing so, the person skilled in the art can also utilize common methods for computer-aided generation of action options and / or for computer-aided identification of optimization potential. Specifically, within the scope of the present invention, a person skilled in the art is considered to be an engineer with several years of professional experience in the field of rotational molding and the production of boat hulls.

[0067] Summary: Rotationally molded floats made of thermoplastic material offer numerous advantages, particularly with regard to high robustness, watertightness, durability, environmental compatibility of any underwater hull protection measures, recyclability, and cost-benefit considerations. However, for comparatively large floats, which, like boat hulls, may be subject to comparatively high dynamic loads, existing rotational molding concepts reach their limits, especially with regard to sufficiently high structural stiffness. The present invention relates to a float with a bow and stern, in particular a watercraft hull, manufactured from thermoplastic material, preferably by rotational molding, comprising a plurality of individual hull segments which, in an interconnected arrangement, define the hull shape of the float, and comprising a plurality of stiffening structures in a cavity formed by the respective hull segment.which, in particular in the case of interconnected hull segments, also form at least partially an internal structure stiffening the hull shape; according to the invention, it is provided that the respective hull segment together with the corresponding stiffening structure is integrally and in one piece made of thermoplastic material, in particular is formed integrally in itself, in particular is produced by rotational molding, wherein one of the hull segments forms a bow hull segment or a stern hull segment of the floating body and is connectable to at least one further hull segment in at least one hull segment connection plane intersecting the longitudinal axis or the intended direction of travel, preferably is connectable circumferentially by a material bond,for the further development of the float, particularly in the longitudinal direction or in the direction of travel. This allows the already known advantages of rotationally molded floats, in combination with high structural stiffness and load-bearing capacity, to be realized, especially for ship hulls, and even for sailboat hulls equipped with rigging and / or deep ballast. The present invention further relates to implementation measures for realizing a rotational molding process and measures for joining rotationally molded hull segments. BRIEF DESCRIPTION OF THE FIGURES

[0068] The invention is described in more detail in the following drawings, whereby reference numerals not explicitly described in a particular drawing are made to the other drawings. They show, in schematic representation: Fig. 1A, Fig. 1B, Fig. 1C each in perspective view a bow hull segment and a stern hull segment of a floating body made from two hull segments according to an embodiment, wherein the two hull segments are / will be connected to each other in a connecting plane extending at least approximately to the longitudinal direction; Fig. 2A, Fig. 2B each in perspective view a bow hull segment and a stern hull segment of a floating body made from two hull segments according to a further embodiment; Fig. 3A in perspective view a floating body made of at least three hull segments according to a further embodiment; Fig. 3B in perspective view Rotational casting molded parts for at least one further hull segment for a floating body made up of at least three hull segments according to exemplary embodiments; Fig. Four steps of a method for creating hull segments of a floating body according to exemplary embodiments; Fig. 5 in perspective view a hull segment equipped with connecting means comprising heat input means according to embodiments, in particular concerning a procedural step in preparation for connecting the hull segment with another hull segment; DETAILED DESCRIPTION OF THE FIGURES

[0069] The invention will first be explained with general reference to all reference numerals and figures. Specific features or individual aspects, or aspects of the present invention that are clearly visible / representable in the respective figure, will be addressed individually in connection with that figure.

[0070] A floating body 10 with bow 1 and stern 3, in particular a watercraft hull, made of thermoplastic material, is provided, comprising a plurality of individual hull segments 11, 13 which, in an interconnected arrangement, define the hull shape of the floating body 10, and comprising a plurality of stiffening structures 10.2 in a cavity V formed by the respective hull segment (corresponding to the usable interior volume enclosed by the double hull, interior space, usable area, living space), which at least partially also form an internal structure stiffening the hull shape; wherein the respective hull segment 11, 13 together with the corresponding stiffening structure 10.2 integrally-in-one-piece made of thermoplastic material, in particular is formed integrally in itself, in particular is produced by rotational molding, wherein one of the hull segments forms a / the bow hull segment 11 or a / the stern hull segment 13 of the float body 10 and is connectable in at least one hull segment connection plane E intersecting the longitudinal axis X10 or the intended direction of travel with at least one further hull segments 11, 12, 13, preferably is connectable circumferentially by material bonding, for further development of the float body 10 in particular in the longitudinal direction or in the direction of travel.

[0071] The respective hull segment, and thus also the float body 10, has a double-walled hull segment shell 10.1 or a double shell made of thermoplastic material, namely an outer hull shell 10a (in the sense of an outer shell of the float body) and an inner shell 10i (in the sense of an inner shell of the float body). The stiffening / bracing structure 10.2, including the stiffening internal structure, can be formed, for example, by steps transverse to the longitudinal axis, edges, projections, steps, bulges, longitudinally extending ribs, optionally recurring from the center inside to the radial outside and / or circumferentially, in particular around the longitudinal axis. The structures can also diverge from the center inside to the outside, starting from a central bow point or a central stern point.

[0072] Advantageously, the body segments can be connected to each other at least in pairs, namely by at least one connection 18, particularly in the area of ​​connection / contact surface sections 14, especially at the end faces. Different or multiple connecting means 18.1 can be provided for this purpose, advantageously including at least heat input elements for bonding the thermoplastic material (cladding material). For example, linear or mat-like heat input elements 18.2, in particular heating wires, are provided or embedded in at least one connection / contact surface section 14. Such heat input elements can also be pre-inserted into the corresponding rotationally molded part so that, after the rotational molding is complete, they are already in the desired position on the respective connection / contact surface section 14.

[0073] For the rotational molding process and optionally also for the joining process, a rotational molding system 30, including a rotational mold and system structure 30.1, including robotics, transfer actuators, and material feed, can be provided. Advantageously, the system 30 is configured to transfer the respective fuselage segment or the molded parts intended for it around several spatial axes, in particular to rotate them. Advantageously, rotationally molded parts for use in pairs are provided for each fuselage segment, which can be assembled together, for example, by means of standard couplings or the like, and which also geometrically define at least one connection / contact surface section 14 of the respective fuselage segment.

[0074] The rotational molding process described here, including the step of joining the hull segments together, comprises, for example, the following steps: - Work preparation (step S0), in particular assembly of rotationally molded parts, setup of the system; - Creating (step S1; S1.1, S1.2, S1.3) a plurality of fuselage segments, optionally individually, optionally superimposed simultaneously of several fuselage segments; - Disassembly (S1a) of rotationally cast molded parts (advantageously in the axial direction) in particular for the purpose of removing the rotationally cast body segment, whereby demolding can also be supported by thermal measures or by means of compressed air or similar technical media; - Connecting (step S2) adjacent hull segments in at least one hull segment connection plane E intersecting the longitudinal axis or the intended direction of travel at connection / contact surface areas or sections 15, in particular material-bonded connection to create an integral floating body from a plurality of hull segments;

[0075] The joining step may include positioning and aligning (S2a) adjacent hull segments relative to each other, optionally by applying a pressing force; the joining step may include the input of heat (S2b) by means of a connecting element, in particular heat input means for creating a material bond between adjacent hull segments, in particular via an current / voltage control or regulation; the joining step may also include the creation (S2c) of a form-fit and / or force-fit connection, in particular subsequently to the material bonding or in advance of it; - Steps concerning the inner hull, in particular the creation (step S3) of interior fittings and / or internal structures, for further design of the floating body, in particular following step S2; - Step (S4) also concerning the outer hull, in particular the rigging or mast and / or keel or ballast on the outside; - Commissioning (step S5) of the float;

[0076] The following section explains special features of the invention with reference to individual figures or embodiments.

[0077] In the Fig. Figure 1 illustrates a floating body constructed from two hull segments, including rotationally molded parts for creating the respective hull segment, wherein the geometry / contour shown is greatly simplified for better understanding and general disclosure of the concept according to the invention. Fig. Figure 2B clarifies that the outer contour of the hull or floating body can be varied, particularly in the deck and underwater areas. Fig. Figure 1A shows at least one end-face connection / contact surface section 14 on the bow hull segment, corresponding to the end face of the double hull 10.1, wherein the end face also has internal stiffening (internal) structures. The corresponding end face of the stern hull segment is advantageously designed to be congruent. Of course, the hull shape in the deck area and at the keel line or on the underside can be designed according to the application-specific purpose of the floating body, i.e., geometrically adapted, in particular flattened. Fig. 1A also indicates the hollow volume 15 enclosed by the double shell or enclosed within the double shell (advantageously hermetically sealed), which may be compartmentalized (divided into individual compartments or sealed off), e.g. intended for filling material or as a tank or similar receiving cavity.

[0078] In Fig. Figure 1B schematically depicts the respective first rotationally molded part 31.1, 33.1 of the bow and stern hull segments, i.e., the outer rotationally molded part defining the outer shell. The inner surface of the respective first rotationally molded part 31.1, 33.1 defines the outer contour of the corresponding hull segment. Corresponding rotationally molded parts can be assembled together for the rotational molding process. The rotationally molded parts can also have a certain material thickness, for example, to enable a specific type of heat transfer. A person skilled in the art can also refer to general technical knowledge regarding the general design of the rotationally molded parts, insofar as the rotational molding technique itself is concerned. In this respect, the present illustration is limited to a schematic representation.

[0079] In Fig. 1C shows, as an example, either the bow or stern hull segment, a corresponding internal second rotationally cast part 33.2 (analogous or equivalent to part 31.2, not explicitly shown here). Contours or similar structures are formed on the surface of the second rotationally cast part 33.2, which define the internal stiffening structure of the corresponding hull segment, i.e., which serve as negative contours for the... Fig. The structures designated 1A are designed as follows: The first and second rotationally molded parts can be assembled in pairs to form the shape / contour of the corresponding hull segment. For the input / feeding of thermoplastic material, for example, an input / feed point 33a can be provided, optionally on the first and / or second molded part, or at several points. Fig. Figure 1C also shows components of a rotational molding machine 30, including the machine structure 30.1, such as beams and supports, as well as robotics, transfer actuators, and similar manufacturing aids. Rotational molding can also be performed around multiple spatial axes, as indicated by the dotted-line arrows.

[0080] In Fig. Figure 1D shows the floating body 10 constructed from the two segments 11 and 13, wherein the segments 11 and 13 are connected to each other in the connection plane E by at least one connection 18, advantageously at least by material bonding using connecting elements (not shown), optionally also by force-fit / form-fit. In this embodiment, the connection plane E extends at least approximately orthogonally to the (central) longitudinal axis X10 of the floating body (or orthogonally to the intended direction of travel) through the central area 5 of the floating body (midship area), i.e., amidships. The exact longitudinal position of the connection plane E can be individually specified. The axial and radial spatial directions x and r are shown in Fig. 1D indicated in relation to the floating body.

[0081] It is understandable that, especially in the Fig. Figure 1 illustrates that the hull shape, formed from (at least) two thimble-shaped hull segments, does not necessarily have to be in this specific geometry, particularly with regard to any axes / planes of symmetry. However, with regard to some design developments, for example in the field of long-distance sailing on hulls with a length of 5m to 12m, this hull shape, especially in the bow area, may already be advantageous in its similarity or approximation, particularly concerning wave behavior and / or maximizing strength, at least as far as the bow section is concerned, for example with regard to so-called scow bow shapes, i.e., a comparatively voluminous design in the bow area. It is also already evident in numerous ship hull designs that a negative sheer and a comparatively smooth transition between the deck and the lateral plane (both in the bow area and on the port and starboard sides) can be advantageously implemented.Based on the present disclosure, a person skilled in the art can decide whether and to what extent edges (e.g., so-called chines, here translated as chine), indentations / protrusions, asymmetries, or the like should be advantageously implemented, either on the outer hull or on the inner hull. The person skilled in the art can also provide additional steps in the inner and outer structure (either on the inner hull from radially inner to radially outer, or vice versa on the outer hull). Furthermore, the person skilled in the art can provide variations such that the at least two hull segments do not necessarily have to be fully connected, for example, by including at least one cockpit opening (e.g., in a larger dinghy or in so-called daysailers). The person skilled in the art can also individually provide additional connecting means at the contact surfaces / areas or connection / contact surface sections described here, e.g.,Positive-locking fasteners (e.g., tongue-and-groove connections). Optionally, such additional fasteners are provided by the integral hull contours themselves and / or by supplementary fasteners in the form of additionally mountable parts or elements.

[0082] In the Fig. Figure 2 shows a variant for the floating body 10 in which at least one mounting 16, 17 is implemented (in particular mast mounting 16 and / or keel mounting 17), namely on the respective end face, i.e. in the area of ​​the respective connecting surface 14 of adjacent hull segments. Fig. 2A indicates a / the mounting 16, 17 on the bow hull segment; a corresponding geometry or mounting (not shown or not visible from the perspective) is provided on the corresponding stern hull segment. Mounting 16 is advantageously used for the arrangement of a mast 7 (cf. Fig. 2B) used, optionally also in the bottom area for the arrangement and / or holding or supporting of at least one ballast component such as a keel 9 (see Fig. 2B). Like the mast, a keel can also be supported in the corresponding receptacle 17 in such a way that high forces and bending moments can be transferred over a relatively wide area via the (at least one) receptacle 17 into the structure. In Fig. Figure 2B shows the floating body 10 formed from the two segments, with the mast 7 (or superstructures and / or rigging components) and keel 9 (or attachments or appendages in the area of ​​the wetted lateral plane, e.g., also a rudder) attached to it. At least the mast 7 is arranged in the recess 16, thus bearing against both hull segments, advantageously in the area of ​​one / the ring bulkhead defined by the interconnected hull segments, formed by the interconnected, abutting connecting surface sections 14 of the two segments. The respective plane E10 (dotted line in Fig. 2B) illustrates a deck plane and / or wetted lateral plane, each according to a design variation.

[0083] The concept of segmenting the hull into several longitudinal segments, as described above, therefore also offers advantages with regard to the integration of components such as the mast and keel, namely in structurally advantageous sections of the hull, particularly in the area of ​​ring-like transverse bulkheads formed at the connection planes of adjoining hull segments. This also facilitates the scaling of rotational molding production technology to larger hull volumes and / or an expansion of its application range, for example, to larger sailing vessels.This applies in particular not only to two hull segments, but to a larger number of hull segments viewed in the longitudinal direction, whereby it can be individually specified at the respective connection level E how a stabilizing transverse bulkhead connection is to be implemented, optionally in combination with at least one receptacle.

[0084] In Fig. Figure 3A shows a variant of a floating body 10 formed from at least three hull segments; the at least one further hull segment 12 (not the bow hull segment or stern hull segment) is implemented between the bow and stern hull segments, and optionally, longitudinal scaling can be achieved by at least one further hull segment 12. Particularly for primarily motor-driven vessels, it may be advantageous to implement the hull design in a scalable manner by means of further hull segments 12 that are more or less non-tapered, i.e., designed with at least approximately parallel outer walls. In the case of the Fig. In the variant shown in 3A, fastening elements 19 (e.g., screw connections, especially for interior fittings, rigging, keel mounting, and similar equipment) are integrally and integrally connected to the (internal) structure, particularly for interior fittings, rigging, keel mounting, and similar equipment. For example, the previously described (internal) structures extend radially inwards in a web-like, integrally solid manner, so that bores or similar fastening elements, e.g., for the design of rivet or screw connections, can be provided on them.

[0085] In Fig. Figure 3B shows a first and a second rotationally molded part 32.1, 32.2 for producing the corresponding additional hull segment. It is worth noting that both rotationally molded parts 32.1, 32.2 can each have a flange (not shown) on one end face for (sealing) assembly to one another, forming the outer and inner contours of the additional hull segment to be covered with thermoplastic material. Optionally, at least one third rotationally molded part in the form of a cover can also be provided. The appropriate design of the rotationally molded parts for each application can be determined by a person skilled in the art after defining the desired stiffening structures, or can be determined using computer-aided design.

[0086] In Fig. 4 are steps of a process for manufacturing a floating body (in particular a watercraft hull) having a bow and stern from thermoplastic material, in particular the steps: Step S0 Work preparation including assembly of rotationally molded parts (setting up the system for rotational molding of at least one of the body segments); Step S1 Creating a plurality of individual hull segments defining the shape of the floating body, in particular bow hull segment and stern hull segment, each by rotational casting, including creating at least one stiffening structure in at least two of the hull segments in a cavity formed by the hull segment such that stiffening structures of adjacent interconnected hull segments also form at least partially an internal structure stiffening the hull shape;wherein, by means of rotational molding, at least one stiffening structure is also formed integrally and in one piece from thermoplastic material such that adjacent hull segments can be connected to each other in at least one hull segment connection plane intersecting the longitudinal axis or the intended direction of travel at connection / contact surface areas, preferably by means of a material-bonded circumferential connection, wherein the connection / contact surface areas are at least partially formed by the stiffening structure; Step S2 Connecting adjacent hull segments in at least one plane; Step S3 Measures concerning the inner shell, in particular interior finishing and / or assembly of internal structures and / or provision of foam insulation or the like; Step S4 measures also concerning the outer hull, in particular equipping the float with rigging and / or ballast on the outside; Step S5 Commissioning of the float, including the process of watering (lowering it into the water);

[0087] Step S1, for example, includes steps S1.1 (creating a bow hull segment), S1.2 (creating a stern hull segment), and optionally also step S1.3 (creating at least one further hull segment), as well as step S1a (disassembling rotationally molded parts). Step S2, for example, includes steps S2a (positioning and aligning adjacent hull segments), S2b (heat input via fasteners), and optionally also step S2c (creating a form-fit and / or force-fit connection).

[0088] The in Fig. The four indicated diamond-shaped fields between the individual steps illustrate process engineering variations that can be implemented by a person skilled in the art, particularly with regard to the way of arranging and positioning hull segments to be connected to each other and / or the way of connecting and / or the way of creating or completing internal structures, e.g., by means of internal components and / or additional stiffening structural elements that can be connected to the thermoplastic structure (e.g., form-fit / force-fit connections, tension connections with tensile force applied over several hull segments; not shown in detail here).

[0089] In Fig.Section 5, with reference to one of the body segments, explains the connection concept described here in detail, including the provision of a connection element comprising heat transfer elements 18.1 for material bonding of the thermoplastic material (cladding material) on connection surface sections 14 of at least one of at least two body segments to be joined. The heat transfer elements 18.1 are preferably wire-like and are optionally provided in numerous layers and / or lines. Preferably, line-like or mat-like heat transfer elements 18.2, in particular heating wires, are embedded on the respective body segment.

[0090] For the process of material bonding, a controlled / regulated energy supply can be provided via the indicated at least one line, in particular via a control / regulation unit 40. Advantageously, this control / regulation occurs at the latest from the point in time at which the second hull segment (not shown) has been brought into contact with the first hull segment at its end. Sensors 20 (optionally communicating wirelessly), in particular comprising at least one temperature sensor 21, can be evaluated during the control process, especially for control in the context of implemented current / voltage sensors 23 (or current / voltage measurement technology), particularly for specifying a predefined amount of heat energy to be supplied as a function of time.

[0091] It should be understood that the figures remain schematic and do not highlight all details, e.g., of connection / contact surface sections. The latter may include, for example, tongue-and-groove connections, or alternatively, other types of positive-locking / force-locking fasteners. Furthermore, the connection / contact surface sections need not necessarily be fully provided or formed, but may be interrupted, particularly in the upper area, e.g., between 10 o'clock and 2 o'clock, i.e., in the upper angular range by approximately 90° (each at, for example, 45° relative to the vertical), for example, to create a cockpit area. Based on the present disclosure, a person skilled in the art can make corresponding variations or application-specific adaptations and optimizations. Reference symbol list 1 bug 3 Rear 5 Midships area 7 superstructures and / or rigging components 9 Additions or attachments 10 floats 10.1 Double-walled fuselage segment shell (double shell) 10a Fuselage outer shell 10i inner sleeve 10.2 stiffening / bracing structure, including stiffening internal structure 11 Hull segment, namely bow hull segment 12 further hull segments 13 fuselage segments, namely the stern fuselage segment 14 Connection / contact surface section, especially end face 15 mm of cavity volume enclosed in / by double shell 16 Mast recording 17 Keel recording 18 Connection, in particular, of two hull segments to each other 18.1 Connecting agents, in particular heat input agents 18.2 linear or mat-like heat input element, in particular heating wire 19 Fasteners 20 sensors, optionally communicating wirelessly 21 Temperature sensor 23 Current / Voltage Sensors 30 Rotational molding machines including rotational molding tools 30.1 Plant structure including robotics, transfer actuators, material supply 31.1 First rotationally molded part for bow hull segment 31.2 Second rotational molding for bow hull segment 32.1 First rotationally molded part for further hull segment 32.2 Second rotational molded part for further hull segment 33.1 First rotationally molded part for tail fuselage segment 33.2 Second rotational molded part for tail fuselage segment 33a Inlet / inlet point on molded part for thermoplastic material 40 Control / regulation unit E Hull segment connection level E10 deck plane and / or wetted lateral plane, each according to design variation S0 Work preparation, in particular assembly of rotationally cast molded parts S1 Creating a plurality of individual hull segments each by rotational casting S1.1 Creating a bow hull segment S1.2 Creating a tail fuselage segment S1.3 Create at least one more fuselage segment S1a Disassembly of rotationally cast molded parts S2 Connecting adjacent hull segments in at least one plane S2a Positioning and aligning adjacent fuselage segments S2b Heat input through fasteners S2c Establishing a form-fit and / or force-fit connection S3 step concerning the inner shell, in particular interior fittings and / or interior structures S4 step also concerns the outer hull, especially rigging and / or ballast on the outside S5 Commissioning of the float V-shaped usable cavity enclosed by a double shell X10 (center) Longitudinal axis of the float x, r axial and radial spatial direction with respect to the floating body QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] US 5,397,525 A

[0010] US 7,833,459 B2

[0010] KR 102014 / 137186 ​​A

[0010] CN 114986768 A

[0010] US 2025 / 073962

[0010]

Claims

[1] Floating body (10) with bow (1) and stern (3), in particular watercraft hull, made of thermoplastic material, comprising a plurality of individual hull segments (11, 13) which in an interconnected arrangement define the hull shape of the floating body (10), and comprising a plurality of stiffening structures (10.2) in a cavity (V) formed by the respective hull segment, which at least partially also form an internal structure stiffening the hull shape; characterized by, that the respective hull segment (11, 13) together with the corresponding stiffening structure (10.2) is integrally and in one piece made of thermoplastic material, in particular is formed integrally in itself, in particular is produced by rotational molding, wherein one of the hull segments forms a / the bow hull segment (11) or a / the stern hull segment (13) of the floating body (10) and is connectable in at least one hull segment connection plane (E) intersecting the longitudinal axis (X10) or the intended direction of travel with at least one further hull segment (11, 12, 13), preferably is connectable circumferentially by material bonding, for further development of the floating body (10) in particular in the longitudinal direction or in the direction of travel. [2] Floating body according to claim 1, wherein adjacent hull segments (11, 13) in the area of ​​one / the hull segment shell (10.1) and / or in the area of ​​the stiffening internal structure and / or in the area of ​​connection / contact surfaces (14) can be connected to each other by at least one of the following connections (18): thermoplastic connection, form-fit / force-fit connections, tension connections with tensile force applied over several hull segments. [3] Floating body according to one of the preceding claims, wherein stiffening structures (10.2) of adjacent hull segments (11, 12, 13) are / are at least partially integrally connected / joined together in the at least one hull segment connection plane (E), e.g. by thermoplastic joining processes, in particular by welding. [4] Floating body according to one of the preceding claims, wherein adjacent hull segments (11, 12, 13) can be connected to each other at connection / contact surface sections in at least one hull segment connection plane (E) intersecting the longitudinal axis (X10) or the intended direction of travel, preferably by means of a material bond around the circumference, wherein the connection / contact surface sections are at least partially formed by the stiffening structure. [5] Floating body according to one of the preceding claims, wherein connecting / contact surface sections of adjacent hull segments are at least partially arranged end-to-end and come into axial contact with each other, in particular connecting / contact surface sections as an integral part of a / the thermoplastic double shell of the respective hull segment. [6] Floating body according to one of the preceding claims, wherein one of the hull segments forms the bow hull segment and one of the hull segments forms the stern hull segment, each manufactured by rotational molding and consisting of a hull segment shell with hull outer shell and inner shell, wherein the bow hull segment and / or the stern hull segment are manufactured / manufacturable by means of a first rotational molding part defining the hull outer shell and a second rotational molding part defining the inner shell, wherein the first and second rotational molding parts are mountable to one another for rotational molding and are disassemblable from one another for removal of the rotationally molded hull segment, in particular detachable with the first rotational molding part in the longitudinal direction at the bow side relative to the hull segment and detachable with the second rotational molding part in the longitudinal direction at the stern side relative to the hull segment. [7] Floating body according to one of the preceding claims, wherein at least two of the hull segments, including at least one of the bow and stern hull segments, are segments that can be installed in the longitudinal direction of the floating body, in particular with cutting planes at least approximately orthogonal to the longitudinal axis or intended direction of travel of the floating body. [8] Floating body according to one of the preceding claims, wherein the respective hull segment limits the formed cavity at least laterally / radially by a double shell. [9] Floating body according to one of the preceding claims, wherein the bow hull segment and / or the stern hull segment limits or encloses the formed cavity both laterally / radially and forwards or backwards in the intended direction of travel by means of a double shell. [10] Floating body according to one of the preceding claims, wherein at least two of the hull segments connected to each other as intended, including at least one of the bow and stern hull segments, have at least one stiffening structure in a section plane at least approximately orthogonal to the longitudinal axis or intended direction of travel of the floating body, which at least partially forms a bulkhead which subdivides and stiffens a / the cavity formed / enclosed by connected hull segments in the plane at least approximately orthogonal to the longitudinal axis. [11] Floating body according to one of the preceding claims, wherein at least one of the hull segments provides a stiffening structure comprising at least one two- or three-dimensional structure from the following group: step transverse to the longitudinal axis, edge, projection, step, curvature, optionally recurring from the center inside to the radial outside and / or in the circumferential direction, in particular circumferentially around the longitudinal axis. [12] Floating body according to one of the preceding claims, wherein at least the bow hull segment and / or at least the stern hull segment has at least one connecting means, advantageously provided over the entire circumference of the hull segment connection plane, in the corresponding hull segment connection plane or at corresponding connection / contact surface sections for the hull segment connection, in particular a heat input means, advantageously comprising at least one linear or mat-like heat input element, configured for material bonding of the thermoplastic material and configured to be / be connected by heat input in a material bonding manner with at least one further hull segment, in particular with at least one further hull segment between bow and stern hull segment, optionally also in the area of ​​form-fitting contours. [13] Floating body according to one of the preceding claims, wherein at least two of the hull segments are connected / connectable to each other in a further hull segment connection plane aligned parallel to the longitudinal axis or direction of travel, in particular central hull segments without tapering of the shape of the hull shell. [14] Floating body according to one of the preceding claims, wherein at least two of the hull segments which are connected or are to be connected to each other as intended each form a part of a mast mount and / or a keel mount, in particular by providing one of two areas of the respective mount opposite each other at the end face. [15] Floating body according to one of the preceding claims, wherein the hollow volume formed by at least one of the hull segments and enclosed by the double shell is at least partially filled with foam or provided with prefabricated parts made of foam. [16] Computer program product comprising instructions which, when the computer program product is executed on a computer, cause the computer to perform steps for controlling a method for manufacturing a floating body having a bow and stern from thermoplastic material according to the following control steps on the computer or in a control unit, namely: controlling the creation of a plurality of individual hull segments of the floating body defining the hull shape of the floating body; controlling the creation of at least one stiffening structure in at least two of the hull segments in a cavity formed by the hull segment such that stiffening structures of adjacent interconnected hull segments also form at least a portion of an internal structure stiffening the hull shape;wherein the creation of the respective hull segment is carried out by rotational molding and comprises the creation of a bow hull segment or a stern hull segment, wherein, by means of rotational molding, at least one stiffening structure is also formed integrally and in one piece from thermoplastic material such that adjacent hull segments can be connected to one another at connection / contact surface areas in at least one hull segment connection plane intersecting the longitudinal axis or the intended direction of travel, preferably by means of a material-bonded connection around the entire circumference, wherein the connection / contact surface areas are at least partially formed by the stiffening structure. [17] Computer program product according to the preceding claim, wherein adjacent fuselage segments in the area of ​​the fuselage segment shell and / or in the area of ​​the stiffening internal structure and / or in the area of ​​connection / contact surfaces are connected to each other by at least one of the following connections: thermoplastic connection, form-fit / force-fit connections, tension connections with tensile force applied over several fuselage segments. [18] Computer program product according to one of claims 16 to 17, wherein stiffening structures of adjacent hull segments are at least partially integrally connected to each other in the at least one hull segment connection plane, e.g. by thermoplastic joining processes, in particular by welding. [19] Computer program product according to one of claims 16 to 18, wherein adjacent fuselage segments are connected to each other at connection / contact surface areas in at least one fuselage segment connection plane intersecting the longitudinal axis or the intended direction of travel, preferably by means of a material bond around the entire circumference, wherein the connection / contact surface areas are at least partially formed by the stiffening structure. [20] Computer program product according to one of claims 16 to 19, wherein one of the hull segments forms the bow hull segment and one of the hull segments forms the stern hull segment, each manufactured by rotational molding and consisting of a hull segment shell with hull outer shell and inner shell, wherein the bow hull segment and / or the stern hull segment are manufactured by means of a first rotational molding part defining the hull outer shell and a second rotational molding part defining the inner shell, wherein the first and second rotational molding parts are assembled together for rotational molding and are disassembled from each other for removal of the rotationally molded hull segment, in particular with the first rotational molding part being detachable in the longitudinal direction at the bow side relative to the hull segment and with the second rotational molding part being detachable in the longitudinal direction at the stern side relative to the hull segment. [21] Computer program product according to one of claims 16 to 20, wherein in rotational molding a first and second rotational molding part form a first and second end face of the corresponding hull segment, each corresponding to at least a first and second cutting plane which intersects the longitudinal axis or intended direction of travel of the float at an angle of at least 45°, preferably being aligned at least approximately orthogonal to the longitudinal axis or intended direction of travel of the float. [22] Computer program product according to one of claims 16 to 21, wherein at least two of the hull segments including at least one of the bow and stern hull segments are installed in the longitudinal direction of the floating body, in particular with cutting planes at least approximately orthogonal to the longitudinal axis or intended direction of travel of the floating body. [23] Computer program product according to one of claims 16 to 22, wherein at least two of the hull segments connected to each other as intended, including at least one of the bow and stern hull segments, have at least one stiffening structure in a section plane at least approximately orthogonal to the longitudinal axis or intended direction of travel of the floating body, which at least partially forms a bulkhead which subdivides and stiffens a / the cavity formed by connected hull segments in the plane at least approximately orthogonal to the longitudinal axis. [24] Computer program product according to one of claims 16 to 23, wherein at least one of the body segments provides a stiffening structure comprising at least one two- or three-dimensional structure from the following group: step transverse to the longitudinal axis, edge, projection, step, curvature, optionally recurring from the center inside to the radial outside and / or in the circumferential direction, in particular circumferentially around the longitudinal axis. [25] Computer program product according to one of claims 16 to 24, wherein at least the bow hull segment and / or at least the stern hull segment has at least one connecting means, in particular a heat input means, advantageously comprising at least one linear or mat-like heat input element, provided over the entire circumference of the hull segment connection plane or at corresponding connection / contact surface sections for the hull segment connection, advantageously comprising at least one material bonding element of the thermoplastic material, wherein a material bonding with at least one further hull segment is effected by heat input, in particular via a current / voltage control or regulation. [26] Computer program product according to one of claims 16 to 25, wherein at least two of the fuselage segments are connected to each other in a further fuselage segment connection plane aligned parallel to the longitudinal axis or direction of travel, in particular central fuselage segments without tapering of the shape of the fuselage shell. [27] Computer program product according to one of claims 16 to 26, wherein at least two of the hull segments which are connected or are to be connected to each other as intended each form a part of a mast mount and / or a keel mount by providing one of two areas of the respective mount opposite each other at the end face. [28] Computer program product according to one of claims 16 to 27, wherein the hollow volume formed by at least one of the hull segments and enclosed by the double shell is at least partially filled with foam or provided with prefabricated parts made of foam. [29] Floating body with bow and stern, in particular watercraft hull, consisting of thermoplastic material, manufactured by a computer program product according to an implementation according to any one of claims 16 to 28, in particular with the following computer-implemented controlled / regulated manufacturing steps: creating a plurality of individual hull segments of the floating body defining the hull shape of the floating body; creating at least one stiffening structure in at least two of the hull segments in a cavity formed by the hull segment such that stiffening structures of adjacent interconnected hull segments also form at least a portion of an internal structure stiffening the hull shape;wherein the creation of the respective hull segment is carried out by rotational molding and comprises the creation of a bow hull segment or a stern hull segment, wherein, by means of rotational molding, at least one stiffening structure is also formed integrally and in one piece from thermoplastic material such that adjacent hull segments can be connected to one another at connection / contact surface areas in at least one hull segment connection plane intersecting the longitudinal axis or the intended direction of travel, preferably by means of a material-bonded connection around the entire circumference, wherein the connection / contact surface areas are at least partially formed by the stiffening structure. [30] Computer program product comprising instructions which, when the computer program product is executed on a computer, cause the computer to execute steps for controlling a method for manufacturing a floating body having a bow and stern according to an implementation according to any one of claims 16 to 28 on the computer or in a control unit, in particular comprising a computer program product configured for controlling the manner of rotational molding for creating a bow hull segment or a stern hull segment of the floating body, wherein at least one stiffening structure of the corresponding hull segment is formed integrally in one piece from thermoplastic material such that adjacent hull segments can be joined to one another at connection / contact surface areas formed at least partially by the stiffening structure.wherein the computer program product is preferably also configured to control / regulate the manner of heat input by means of at least one connecting means, in particular a heat input means, in particular via a current / voltage control or regulation, for the material-bonded joining of adjacent hull segments comprising at least a bow hull segment and / or a stern hull segment, following rotational molding. [31] Use of a plurality of rotationally molded parts in the rotational molding of hull segments from thermoplastic material to form a floating body, in particular a watercraft hull, wherein at least one bow hull segment and optionally also a stern hull segment and / or further hull segments arranged / to be arranged between bow and stern are rotationally molded, wherein the bow hull segment is produced by means of a first rotationally molded part defining the outer hull shell in the bow area and a second rotationally molded part defining the inner shell of the bow hull segment, wherein the first and second rotationally molded parts can be assembled together for rotational molding and can be disassembled from each other for removal of the rotationally molded bow hull segment,in particular, the first rotationally molded part is detachable in the longitudinal direction at the bow side relative to the hull segment and the second rotationally molded part is detachable in the longitudinal direction at the stern side relative to the hull segment, wherein the second rotationally molded part also defines at least partially an internal structure stiffening the hull shape; in particular in the manufacture of a floating body according to one of claims 1 to 15; in particular according to an implementation according to one of claims 16 to 28 or 30. [32] Use of at least one connecting means, in particular a heat input means, embedded in the area of ​​at least one connection / contact surface of a rotationally molded hull segment for the material-bonded joining of rotationally molded hull segments made of thermoplastic material by heat input in the area of ​​connection / contact surfaces of hull segments intended to be adjacent to one another, comprising at least one bow hull segment and / or one stern hull segment, preferably with the at least one connecting means embedded over the entire circumference of the respective hull segment, wherein the at least one connecting means advantageously comprises at least one line- or mat-like heat input element, preferably at least one heating wire; in particular in the manufacture of a floating body according to one of claims 1 to 15; in particular according to an implementation according to one of claims 16 to 28 or 30.

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