Support body and water sports device

Abstract

The invention relates to a support body (200) for connecting to a watercraft (1), comprising an upper side (201) and a lower side (210) opposite the upper side (201), wherein the support body (200) has, in the region of the upper side (201), a support surface (202) on which a user can rest with parts of their body, wherein the support body (200) is designed to be moved along a water surface by the watercraft (1) in a direction of travel (F). The invention also relates to a water sports device comprising a watercraft (1) and such a support body (200). More energy-efficient movement along a water surface and increased travel speeds are made possible in that the support body (200) has an air guide arrangement which is designed to guide air into the region of the lower side (210) of the support body when it is moved along the water surface.

Description

[0001] Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0002] CAYAGO TEC GmbH

[0003] Benzstrasse 10

[0004] 32108 Bad Salzuflen

[0005] Support structure and water sports equipment

[0006] The invention relates to a support body for connection with a watercraft, having a top and a bottom opposite the top, wherein the support body has a support surface in the area of ​​the top on which a user can rest with parts of his body, wherein the support body is designed to be moved by the watercraft in a direction of travel along a water surface.

[0007] The invention also relates to a water sports device, comprising a watercraft and such a supporting body.

[0008] Within the scope of the invention, flotation and diving aids can be used as watercraft. They can be used to pull a user across a water surface. It is conceivable that the watercraft is capable of switching between surface travel and submersion. In particular, the watercraft can be designed to effect the switch between surface travel and submersion solely by shifting weight.

[0009] Page 1 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0010] Within the scope of the invention, a watercraft can, for example, be configured such that it has a support on its upper surface on which a user can rest part of their body. In particular, the watercraft can be designed so that a user rests part of their upper body in the stern area during ferry operations.

[0011] Preferably, watercraft according to the invention may be provided with handholds to which a user can hold on. The handholds may be arranged on the hull, preferably in the front part of the watercraft, particularly in the bow area of ​​the submersible, for example on the starboard and port sides. In particular, a handhold may also be equipped with controls by means of which functions of the submersible can be controlled. Alternatively or additionally, it is conceivable that controls are provided in a surrounding area of ​​the handholds, for example on the hull of the watercraft. Preferably, in this case, controls may be provided in sufficient proximity to the handholds so that a user can operate them without letting go of the handhold.

[0012] For example, the speed of an electric motor used to propel the watercraft, such as a propeller, can be varied using one or more control elements. Preferably, watercraft according to the invention can be designed such that they are driven at a speed of less than 5000 rpm, particularly preferably at a speed of less than 3000 rpm, via a drive shaft, in order to achieve suitable propulsion power for both surface and underwater travel.

[0013] Furthermore, a watercraft according to the invention may have a display which is arranged in the user's field of vision and which is designed to display functions and / or operating states of the submersible. Control elements may be provided in the area of ​​the display by means of which functions of the submersible can be controlled. In particular

[0014] Page 2 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0015] It is conceivable that controls could be integrated into the display, for example, by making the display at least partially touch- or pressure-sensitive. Alternatively or additionally, it is conceivable that controls could be provided in a surrounding area of ​​the display. Preferably, in this case, the controls could be arranged so that they are within the user's field of vision along with the display.

[0016] From DE 10 2019 127 224 A1, a water sports device is known comprising a watercraft to whose hull a supporting body is rigidly attached. The hull of the watercraft has a support on which a user can rest their upper body. The supporting body has a bearing surface on one of its upper sides. The supporting body can be towed along the water surface by means of the watercraft.

[0017] When moving through water, especially along the water's surface, friction occurs between the water and the surfaces of the watercraft in contact with it. This results in frictional losses both within the watercraft and its hull. These frictional losses reduce the energy efficiency of movement and thus lead to increased energy consumption by the watercraft. Furthermore, friction negatively impacts the achievable speed of the watercraft.

[0018] The object of the invention is to provide a support body of the type mentioned above that enables more energy-efficient movement along a water surface as well as increased driving speeds.

[0019] It is also an object of the invention to provide a water sports device of the type mentioned above, which enables more energy-efficient movement along a water surface as well as increased driving speeds.

[0020] Page 3 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0021] The problem relating to the supporting body is solved by the supporting body having an air guidance arrangement designed to guide air into the area of ​​its underside when it is moved along the water surface.

[0022] The underside of the support structure is designed to rest on a water surface during operation and to be moved along it. For example, the support structure can be moved along the water surface by a watercraft to which it is connected.

[0023] In this context, a rigid connection between the support structure and the watercraft can be provided. A detachable connection between the watercraft and the support structure is particularly preferred. In this case, it is especially advantageous if an interchangeable coupling is effective between the hull of the watercraft and the support structure. Accordingly, at least one interchangeable coupling element can be provided on the support structure. The watercraft can then have a corresponding interchangeable coupling counterpart that can be connected to the interchangeable coupling element. By means of such an interchangeable coupling, the support structure can be interchangeably connected to the hull. The user can easily attach or detach the support structure via this coupling connection in order to switch between the different operating modes.For example, it may be provided that two spaced-apart profile sections protrude from the support structure as interchangeable coupling elements. The longitudinal axes of the profile sections may run in the direction of a central longitudinal axis of the watercraft and / or the support structure. Furthermore, it may be provided that plug-in sockets are provided on or in the hull of the watercraft as interchangeable coupling counterparts, into which the profile sections can be inserted. Suitable clamping devices can prevent the profile sections from unintentionally detaching from the plug-in sockets.

[0024] By providing an air guidance system designed to direct air into the area of ​​the underside of the support structure, friction losses on the underside can be significantly reduced. The underside area can, for example, include the underside itself as well as an area...

[0025] Page 4 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0026] which is located below the underside, i.e., within the water surface during operation. Therefore, air bubbles, for example, which are present in the area of ​​the underside due to air being introduced there, can act as a lubricant between the support structure and the water. Furthermore, the compressibility of air introduced between the underside and the water surface allows shocks, such as those caused by waves on the water surface, to be dampened, thus enabling more comfortable operation.

[0027] According to a preferred embodiment of the invention, the air guidance arrangement may include at least one air duct. The air duct may have an air inlet, an air outlet, and a duct section that connects the air inlet and the air outlet. Accordingly, air can enter the air duct through the air inlet and be guided through the air duct to the air outlet. The air can then exit the air duct through the air outlet. If the air outlet is located on the underside, it can be easily ensured that the air is directed at least predominantly to the underside of the support body.

[0028] An arrangement of the air outlet in the underside area can, in particular, include an arrangement on the underside. For example, the air outlet can be designed to open into the underside. For example, the air outlet can be an opening in the underside that is connected to the duct section via an air guide. However, it is also conceivable that the air outlet is arranged at a distance from the underside, whereby a sufficiently small distance should be provided to ensure that enough air is directed into the underside area. For example, the distance can be less than the clear opening width of the air outlet or a multiple of the clear opening width, such as three times, twice, one and a half times, or half the clear opening width.

[0029] It may preferably be further provided that the air inlet is located on a side of the support body that differs from the underside.

[0030] Page 5 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0031] The supporting structure can, for example, have a front face oriented in the direction of travel. If the air inlet is located in the area of ​​the front face, it can be oriented such that a surface normal of its inlet surface has at least one component, preferably a predominant component, in the direction of travel. In this way, for example, the airflow from the vehicle's movement can be used to draw air through the air inlet into the channel section. It is also conceivable that an air inlet, particularly one located on the front face, is suitable for being connected, directly or indirectly, to an outlet of the vessel. In this way, air exiting an outlet of the vessel can be guided through the air inlet into the channel section and ultimately to the underside of the supporting structure.

[0032] It is also conceivable that the air inlet is provided in the area of ​​the upper surface of the support structure and / or in the area of ​​a longitudinal side adjoining the front face. The longitudinal side can, for example, be a side extending both from the front face to a rear surface oriented opposite to the direction of travel and from the upper surface to the underside of the support structure. Here, too, in order to utilize the airflow, the air inlet can be oriented, for example, such that a surface normal of its inlet surface has at least one component, preferably a predominant component, in the direction of travel.

[0033] An arrangement of the air outlet on a side differing from the underside can, in particular, include an arrangement on the respective side. For example, the air outlet can be designed to open into the respective side. Specifically, the air outlet can be an opening in the respective side that is connected to the duct section via an air-conducting connection. However, it is also conceivable that the air outlet is arranged at a distance from the respective side. A compact design of the supporting body can be achieved if a sufficiently small distance is provided. For example, the distance can be less than the clear opening width or a multiple of the clear opening width, such as three times, twice, one and a half times, or half the clear opening width.

[0034] Page 6 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0035] According to an advantageous embodiment of the invention, it is proposed that the channel section be formed at least partially within a base body of the support structure, between the upper and lower surfaces. This results in a compact design of the support structure. In particular, external air ducts such as tubes, hoses, or the like can be dispensed with in relation to the base body. Furthermore, this approach allows for simple manufacturing of the support structure. In particular, one-piece manufacturing using a primary forming process, for example, a casting process, can be considered.

[0036] If the air outlet is designed to increase in width opposite to the direction of travel, extending perpendicular to the direction of travel and perpendicular to a surface normal of a portion of the underside adjacent to the air outlet, the air exiting the outlet can be advantageously distributed across the underside, particularly in a direction transverse to the direction of travel. By means of such a widening air outlet, a component oriented transversely to the direction of travel can be imposed on the direction of movement of at least some of the exiting air bubbles relative to the supporting body. This allows for improved wetting of the underside with air bubbles. To avoid flow obstructions for the exiting air, it is preferable to provide for a continuous increase in width.

[0037] According to an advantageous embodiment of the invention, it is proposed that a cross-sectional area of ​​the duct section increases, preferably continuously, along at least regions of a central longitudinal line of the duct section towards the air inlet. A central longitudinal line is understood to be, in particular, a line that has the same distance at all points in its normal direction to all surrounding walls of the duct section. In particular, a region of the duct section adjoining the air inlet can thus be designed to narrow in the direction of airflow, i.e., to act as a confuser. In this way, pressure energy of the air, particularly due to dynamic pressure, acting at the air inlet can be converted into kinetic energy within the

[0038] Page 7 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0039] This will be implemented in the duct section, enabling more efficient airflow through the air duct.

[0040] A preferred embodiment of the invention is such that the air guidance arrangement comprises at least one air guidance element that is open on the underside. An air guidance element that is open on the underside can be manufactured in a particularly simple manner. Due to the buoyancy of air bubbles in water, these can be reliably guided along the air guidance element despite the opening on the underside. An additional advantage is that the opening on the underside allows contact with the surrounding water, thus enabling the lubricating effect of the air to take place.

[0041] Such an open-bottom air guide element can be manufactured using simple means, particularly if it is designed to be formed by shaping at least a section of the underside of the support body. For example, it can include a recess on the underside of the support body, or be formed by a recess. To simplify the supply of air to the air guide element, the recess can be designed to open into an end face of the support body facing in the direction of travel, forming an air inlet for the air guide element. It is conceivable that air is supplied to the air guide element via this air inlet, utilizing the airflow generated by the vehicle's movement.

[0042] However, it is also conceivable that the air inlet could be connected, directly or indirectly, to an outlet of the watercraft. In this way, air exiting from an outlet of the watercraft could be guided through the air inlet into the air guide element, which is open at the bottom.

[0043] If the depth of the recess decreases relative to the underside of the support structure in the opposite direction of travel, a flow-optimized transition between the recess and the remaining part of the underside can be achieved. In particular, it can be provided that the depth of the recess decreases.

[0044] Page 8 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0045] The volume decreases continuously. This ensures that no obstacles, such as steps or similar, prevent the transport of the air bubbles.

[0046] According to a preferred embodiment of the invention, it is proposed that the air guidance arrangement comprises at least two air channels arranged on either side of a central longitudinal plane of the support body. The central longitudinal plane can extend in the direction of travel and transversely, in particular perpendicular to the top and / or the bottom and / or the water surface. Preferably, the central longitudinal plane is arranged centrally between the longitudinal sides of the support body. Particularly preferably, the central longitudinal plane forms a plane of symmetry of the support body. In this sense, the at least two air channels can also preferably be arranged symmetrically with respect to the central longitudinal plane. The arrangement of at least two air channels on either side of the central longitudinal plane results in a uniform supply of air to the area of ​​the underside of the support body.

[0047] Particularly preferably, the air guidance arrangement may comprise four air channels, two of which are arranged on each side of the central longitudinal plane of the support body. For example, two air channels may be provided in a forward region (in the direction of travel) and in a rear region (relative to the forward region) with respect to the forward region. In this way, a uniform supply of air to the underside can be ensured, for example, over the entire length of the support body.

[0048] Alternatively or additionally, the air distribution system can include at least one air distribution element open on the underside, located in the region of the central longitudinal plane of the support body. This ensures an adequate supply of air in the region of the central longitudinal plane. For example, the air distribution element can be arranged and / or designed symmetrically to the central longitudinal plane.

[0049] The problem concerning the water sports equipment is solved by the features of the claim. Accordingly, the water sports equipment comprises a watercraft and a support structure according to any one of claims 1 to 10. The watercraft has

[0050] Page 9 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0051] A hull with a platform on which a user can rest at least partially with their upper body. The platform is attached to the watercraft, in particular rigidly. It is conceivable, however, that the platform is detachably connected to the watercraft. In that case, a user can optionally use the watercraft without the platform. A rigid connection is understood to mean, in particular, a connection that at least predominantly prevents relative movement between the watercraft and the platform.

[0052] According to an advantageous embodiment of the invention, it is proposed that the watercraft has one or more outlet openings designed to establish an air-conducting connection between the interior of the hull of the watercraft and the environment, either directly or indirectly.

[0053] For example, the submersible can have a flooding chamber in its hull, which is connected to the surrounding environment via openings. It may be provided that at least one inlet opening is located in the bow area and at least one outlet opening is located in the stern area of ​​the submersible. For example, the inlet opening and / or outlet opening may penetrate the hull. When the submersible is placed in the water, the flooding chamber fills at least partially with the surrounding water via the inlet opening. When the submersible is lifted out of the water, the flooding chamber can empty itself via the outlet openings. Preferably, it may also be provided that an additional outlet opening is located on the starboard and / or port side. When the submersible is moved along the water's surface, the flooding chamber is preferably only partially filled with water.Accordingly, air can be guided through the flooding chamber from the inlet opening to the outlet opening. Preferably, the air is transported at least with the assistance of the airflow from the vehicle.

[0054] If the supporting structure is designed and arranged to direct air exiting from the interior of the fuselage through one of the outlet openings into the area of

[0055] Page 10 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0056] The air guide system directs air to the underside, where it acts as a lubricant between the support structure and the water. Furthermore, introducing air between the underside and the water surface dampens shocks, such as those caused by waves, resulting in smoother operation.

[0057] This can be achieved with a particularly simple design of the support structure if it is intended that the support structure be positioned relative to the watercraft such that its underside is located above the air outlet opening, so that the air between the water surface and the underside can be retained, at least temporarily. In this case, it may suffice if the air guide arrangement is formed at least partially by the underside, and in particular, entirely by the underside. In the simplest case, the underside can be designed to be at least predominantly flat.

[0058] A preferred embodiment of the invention proposes that the air inlet of the air guide element of the support body is arranged in the region of one of the outlet opening(s) of the watercraft to allow airflow from the outlet opening to the underside of the support body. For example, the air guide element, as previously described, can be formed by shaping at least a section of the underside of the support body, in particular by forming a recess opposite the underside of the support body. The air inlet can then be formed, for example, by the recess opening into the end face of the support body.

[0059] Alternatively or additionally, it may be provided that the air inlet of the air duct of the supporting body is located in the area of ​​one of the outlet opening(s) of the watercraft in order to allow an airflow from the outlet opening via the air inlet into the duct section of the air duct.

[0060] A water sports device characterized by particularly advantageous driving dynamics can be provided if it is intended that the

[0061] Page 11 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0062] The watercraft has at least one sliding surface on its hull which is designed and arranged to enable the watercraft to slide on the water surface, and the underside of the supporting body forms a continuation of the sliding surface, in particular is aligned at least partially parallel to it, and is especially preferably at least partially in a common plane with it.

[0063] The invention is explained in more detail below with reference to an embodiment illustrated in the figures. The figures show:

[0064] Figure 1 shows a schematic perspective view of a water sports device with a watercraft and a support body.

[0065] Figure 2 shows a further schematic view of the water sports equipment from Figure 1.

[0066] Figure 3 shows the water sports equipment from Figure 1 in a schematic top view.

[0067] Figure 4 shows a partially cutaway schematic perspective view of the stern area of ​​the watercraft and the supporting hull.

[0068] Figure 5 shows a section of a sectional view in a plane marked V in Figure 3,

[0069] Figure 6 shows the supporting structure in a schematic perspective view,

[0070] Figure 7 shows the supporting body in a top view, and

[0071] Figure 8 shows a sectional view of the supporting body in a plane labelled VIII in Figure 7.

[0072] Figures 1 to 5 show a water sports device comprising a watercraft 1 and a support structure 200. The watercraft 1 can be used as a floating and

[0073] Page 12 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0074] The watercraft 1 has a hull 10. For example, as shown in Figure 1, the hull 10 may have an upper shell 20. The upper shell 20 may be made of one piece or of multiple parts.

[0075] In the bow area 22 of the watercraft 1, a bow tip 21 is formed. The bow tip 21 forms the front end of the watercraft 1. For example, the bow tip 21 may be formed by the upper shell 20. However, it is also conceivable that the bow tip 21 is formed by the lower hull 30. The lower hull 30 may, for example, be formed by a lower shell that is connected to the upper shell 20. The lower shell may be formed in one piece or in multiple pieces.

[0076] A handle 24 is attached to the upper shell 20 on both the starboard side 11 and the port side 12. At least one control element 25 can be attached to one or both of the handles 24. The control element(s) 25 are used to control functions of the watercraft 1. As the illustrations show, the handles 24 are preferably located in the bow area 22 of the submersible.

[0077] A display 23 is arranged centrally, preferably in the area between the two handles 24, in the area of ​​the upper shell 20. Information about the operating states of the watercraft 1 can be displayed on the display 23 and read by a user.

[0078] The handles 24 extend towards the stern 27 of the watercraft, with 1 armrest 26. The armrests 26 extend on the port 12 and starboard 11 sides.

[0079] Figure 1 further shows that a charging port 28 can be provided in the area of ​​the upper shell 20. The charging port 28 is covered by a protective cap. This cap can be removed, thus exposing the electrical contacts of the charging port 28. The watercraft 1 can be connected to a power supply via the charging port 28 in order to charge at least one accumulator 60, which is housed in the hull 10 of the watercraft 1.

[0080] Page 13 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0081] Figure 1 shows that the upper shell 20 can be convexly curved, in particular biconvexly, following the bow tip 21. This results in a streamlined shape that is optimized for underwater operation.

[0082] The lower hull 30 can be designed such that it has a rounded area 31 following the bow tip 21, which can be convex, in particular biconvex. Such a design is optimized for hydrodynamics both for surface and underwater travel.

[0083] As shown in Figure 2, a bulge 32 may be present in the rounded area 31, which defines a space arranged in the hull 10. A component of the watercraft 1 may be accommodated in this space. For example, an electric motor and / or a control unit, which is installed in the bow area 22 of the hull 10, may be accommodated in the area of ​​the bulge 32 in the hull 10. This facilitates a compact design.

[0084] Figure 2 further illustrates that the lower hull 30, preferably immediately adjoining the rounded area 31, has sliding surfaces 37. Preferably, the sliding surfaces 37 extend on the port and starboard sides.

[0085] The sliding surfaces 37 can preferably extend to the stern 27 of the watercraft 1, where they then form end sections 37.3.

[0086] The sliding surfaces 37 can be designed as three-dimensionally shaped surfaces in space. The sliding surfaces 37 can also be designed as planar surfaces or at least have one such planar surface.

[0087] Figure 2 further shows that the sliding surfaces 37 extend on both sides of a flow channel recess 38. The flow channel recess 38 projects from the bottom of the hull 30. The flow channel recess 38 may have two spaced-apart side walls 38.1, which are connected indirectly or

[0088] Page 14 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0089] directly, for example via preferably concave rounded transitions 38.3, to the sliding surfaces 37 on the port and starboard sides.

[0090] The two side walls 38.1 can be connected to each other via a connecting section 38.2, wherein the connecting section 38.2 is preferably convexly curved.

[0091] Preferably, the convexly curved area 31 transitions into the planing surfaces 37, with the bow tip 21 positioned above the planing surfaces 37. When the watercraft 1 is moving above water, the water is directed under the planing surfaces 37 to achieve optimized water flow to these areas. This also prevents or eliminates disruptive spray.

[0092] The flow channel recess 38 forms or encloses a section of the hull 10, within which a flow channel 39.2 is incorporated. The flow channel 39.2 forms a flow inlet, approximately in the midsection of the watercraft 1. In the stern area 27, the flow channel 39.2 forms a flow outlet 39.

[0093] The flow channel 39.2 can be formed and / or bounded at least partially by a single or multi-part hollow body, and it can be provided that the hollow body is held at least partially in the flow channel receptacle 38.

[0094] Figure 2 illustrates that the flow outlet 39 is bounded by a, preferably circumferential, boundary edge 39.1.

[0095] A guide element 33 is arranged in the area of ​​the flow inlet. The guide element 33 can preferably be formed as a single piece with the lower shell, which forms the hull 30. However, it is also conceivable that the guide element 33 is formed as a separate component which is connected to the hull 30. The guide element 33 can be designed such that it forms an underside edge 33.1 of a wall 33.3.

[0096] Page 15 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0097] The edge 33.1 and thus also the wall 33.3 extend in the direction from the bow to the stern 27.

[0098] Preferably, the wall 33.3 of the guide element 33 divides the area of ​​the inlet opening into the flow channel 39.2 into two sub-areas. This creates two, preferably separate, feed areas 34.1 and 34.2. The first feed area 34.1 runs on the port side and the second feed area 34.2 on the starboard side.

[0099] However, it is not necessary for the wall 33.3 to completely separate the two supply areas 34.1 and 34.2 from each other. Rather, it is also possible that overflow areas are formed between the two supply areas 34.1 and 34.2.

[0100] Furthermore, the guide element 33 may be connected to the connecting section 38.2 of the flow channel intake 38, preferably adjacent to the edge 33.1.

[0101] As the drawings show, the guide element 33 can be coupled to the inflow-side edge of the flow channel receptacle 38 at a connection point 33.4. Adjacent to the connection point 33.4, the guide element forms a fastening section by means of which the guide element 33 is attached to the inner side of the connecting section 38.2 facing the flow channel 39.2, for example, by being integrally molded.

[0102] Preferably, the wall 33.3 forms a fastening section that extends into the flow channel 39.2, so that the wall 33.3 is also connected to the connecting section 38.2 on the inside of the connecting section 38.2 in the direction of the rear 27 by means of a correspondingly designed fastening section.

[0103] Preferably, the flow channel receptacle 38 is designed as a single unit with the guide element 33.

[0104] Page 16 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0105] The guide element 33 extends towards the stern 27, past the edge of the connecting section 38.2 facing the inlet opening, and into the flow channel 39.2 in the area of ​​the connection point 33.4. In the flow direction, the guide element 33 separates two feed areas 34.1 and 34.2 from each other in the flow channel 39.2 behind this connection point 33.4.

[0106] Preferably, a motor, preferably an electric motor, is arranged inside the hull 10, which drives a propeller by means of a drive shaft. Preferably, the drive shaft is guided within a sheathing tube so that the rotating drive shaft does not, or only minimally, influence the water flow in the supply area 34.1, 34.2.

[0107] The propeller can be non-rotatably connected to the drive shaft and arranged in the flow channel 39.2. A centering unit, preferably in the form of a centering star, can be held in the flow channel 39.2 upstream of the propeller 36 in the direction of flow.

[0108] The centner unit can have a hub to which centner wings are attached. The centner wings can preferably be connected to the inner wall of the flow channel at their ends facing away from the center, preferably as a single unit. The drive shaft can be guided and preferably held centered in the flow channel by a receptacle in the hub of the centner unit.

[0109] Preferably, at least three hundredweight wings are used, which are arranged offset from each other in the circumferential direction of the drive shaft, preferably at the same pitch.

[0110] It is particularly preferred that the wall 33.3 of the guide element 33 is at least partially connected to the centering unit, preferably integrally connected. For example, the wall 33 may be connected to the hub and / or to at least one of the centering wings. Preferably, the wall 33.3 is integrally connected to the centering unit. This reduces the number of parts and improves manufacturing accuracy.

[0111] Page 17 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0112] improved. In addition, this results in improved flow behavior in the flow channel 39.2, as it allows for a more compact design.

[0113] Preferably, the guide element 33 has a through-passage in the flow channel 39.2 downstream of the inlet opening. The sheathing tube, which houses the drive shaft, can be guided into the flow channel 39.2 through this through-passage. Preferably, the sheathing tube is sealed against the through-passage.

[0114] The guide element 33 can preferably be designed such that it extends with a transition 33.2 into the bow-side rounding area 31, as illustrated in Figure 2.

[0115] Furthermore, it is possible that wall 33.3 tapers off towards the front, i.e. towards the bow, with a decreasing height.

[0116] The wall 33.3 forms water guidance surfaces on both sides, extending from the bow area 22 towards the stern 27 and directing the flowing water towards the associated supply area 34.1 or 34.2.

[0117] In the direction of flow behind the propeller, a flow stator 40 can preferably be arranged in the flow channel 39.2. Preferably, the flow stator 40 is arranged in the region of the rear end of the flow channel 39.2. The flow stator 40 has several stator vanes 41, which preferably extend radially to a thrust axis that coincides with an axis of rotation of the drive shaft.

[0118] As illustrated in Figure 2, the stator wings 41 can be connected to each other in the middle of the flow channel 39.2 by means of a stator tip 42.

[0119] The propeller generates a rotating water jet in the flow channel 39.2. The flow stator 40 serves to reduce the rotation in the water jet or, ideally, to direct it without swirl. This results in improved thrust.

[0120] Page 18 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0121] As can be seen from Figure 5, at least one, preferably two, accumulators 60 can be accommodated within the hull 10. If two accumulators 60 are used, they can each be positioned on either side of a central longitudinal plane of the watercraft 1. Preferably, the two accumulators 60 are arranged symmetrically with respect to the central longitudinal plane.

[0122] The accumulator(s) 60 can have a tube section in the form of a hollow profile 60.1, within which a plurality of accumulator cells are arranged. The tube section is sealed watertight at its longitudinal ends by means of covers 65, 66. Preferably, electronics for monitoring and / or controlling the accumulator cells are housed within the sealed area of ​​the tube section.

[0123] As Figure 5 further shows, a flooding chamber 70 may be formed in the hull 10. The flooding chamber 70 is connected to the surroundings via water inlets. There may be at least one water inlet 71 in the bow area and at least one water outlet 72 in the stern area of ​​the submersible. The water inlet 71 and / or the water outlet 72 may penetrate the hull shell, for example, formed by the lower and / or upper shell of the submersible.

[0124] When the submersible is placed in the water, the flooding chamber 70 fills with ambient water through the water inlets. During operation in the water, and especially during submersion, a water flow is created in the flooding chamber 70 from the water inlet 71 to the water outlet 72, thus providing continuous cooling of the electrical components, particularly the batteries 60 and / or the motor in the flooding chamber 70. Furthermore, the flooding chamber 70 can accommodate water as a variable mass component by being filled, partially filled, or emptied. When the flooding chamber 70 is filled or partially filled, it facilitates the transition from surface to submerged operation. When the submersible is removed from the water...

[0125] Page 19 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0126] When the submersible is lifted, the flooding chamber empties through the water passage openings. Preferably, it can also be additionally provided that a water passage opening is located on the starboard side 11 and / or on the port side 12, through which the water can be drained from the flooding chamber 70 when the submersible is lifted out of the water.

[0127] It may be provided that a control unit is arranged in hull 10, by means of which all or at least some of the functions of the submersible can be electrically controlled. The control unit may be assigned to the engine and connected to it electrically and / or mechanically.

[0128] According to one design variant, the control unit can be arranged in the flooding chamber 70 in addition to or as an alternative to the accumulator(s) 60. As mentioned previously, for cooling purposes, it is also conceivable that the electric motor is arranged in the flooding chamber 70 in addition to or as an alternative to the accumulator(s) 60 and in addition to or as an alternative to the control unit 63.

[0129] As can be seen in Figure 2, the sliding surfaces 37 can be located on both sides of the flow channel opening 38 on the hull 30 and can be arranged facing downwards. The sliding surfaces 37 can be formed at least partially by flat surfaces, by three-dimensionally shaped surfaces, or by a combination of a three-dimensionally shaped surface and at least one flat surface. In the present embodiment, the sliding surfaces 37 are formed partially, preferably mostly, by flat surfaces.

[0130] As shown in Figure 2, the end sections 37.3 of the planing surfaces 37 are followed by central sections 37.2 towards the bow. The central sections 37.2 also run laterally alongside the flow channel inlet 38 on the port and starboard sides, respectively. Facing away from the end sections 37.3, the central sections 37.2 each transition into a planing surface front section 37.1. The planing surface front section 37.1 passes the inlet opening of the flow channel inlet 38 and preferably extends into the

[0131] Page 20 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0132] Bow area 22. The sliding surface front sections 37.1 preferably serve to transition the sliding surfaces 37 continuously into the rounding area 31 in the bow area 22, either directly or indirectly.

[0133] Figure 2 illustrates that the width of the guide element 33, extending perpendicularly to the central transverse plane of the watercraft 1, increases in the direction from the stern to the bow, preferably continuously. It is also possible that the guide element 33, at its bow end facing away from the stern 27, transitions into a curved section 31 of the hull 30, which is curved towards the underside of the watercraft 1. This curved section 31 is located in the bow area 22 and preferably extends from the guide element 33 to the bow tip 21.

[0134] As shown, for example, in Figure 2, at least one foot 90 can be arranged in the area of ​​the underside of the flow channel receptacle 38. The watercraft 1 can be placed on this foot on land without damaging the flow channel receptacle 38. Preferably, the foot 90 is integrally connected to the flow channel receptacle 38.

[0135] Additionally or alternatively, one or more support feet 100 can also be provided at the bow, for example molded onto the underside of the hull 10. Here too, the support feet 100 serve to park the watercraft 1 on land without causing damage.

[0136] As shown in Figures 1, 2, and 3, side wings 110 can be provided on both sides in the stern area of ​​the watercraft 1. The side wings 110 can be adjustable between a set operating position (not shown) and an extended operating position, which is shown in the figures. For this purpose, the hull 10 of the watercraft 1 can have wing mounts 111, which are connected to the surroundings via preferably slot-shaped openings. The side wings 110 can be adjusted through these openings. In the extended operating position, the side wings 110 increase the width of the submersible.

[0137] Page 21 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0138] In the retracted operating position, the side wings 110 protrude only slightly beyond the contour of the fuselage 10.

[0139] It is also conceivable that the side wings 110 are completely moved into the fuselage 10, so that they do not protrude laterally beyond the fuselage 10.

[0140] Preferably, the side wings 110 are each laterally associated with a sliding surface 37 by means of a wing underside 112. In this way, the side wings 110 widen the sliding surfaces 37 laterally when extended. This provides an increased total sliding surface area, which supports the planing behavior of the submersible. As illustrated in Figure 2, the wing underside 112 can connect to the sliding surface 37 via a step for this purpose. It is also conceivable that the wing underside 112 connects to the sliding surface 37 seamlessly, i.e., is flush with it.

[0141] As the illustrations show, the side wings 110 can be plate-shaped, and may, for example, have at least a flat underside and / or a flat upper surface 112 or 113, respectively. However, it is also conceivable that the upper surface 113 is curved, at least in some areas. Similarly, the underside need not be flat, but may have a curvature, at least in some areas. In the present embodiment, the underside 112 is flat and thus adapted to the flat contour of the adjacent area of ​​the sliding surface 37.

[0142] As illustrated in Figure 2, the side wings 110 have a leading edge 116. When extended, the side wings 110 widen continuously towards the rear in the area of ​​this leading edge 116 until they reach a maximum extension width. It is possible that, in the area of ​​maximum extension width 120, the side wings 110 form a convex contour when viewed from above, as can be seen in Figure 3.

[0143] Page 22 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0144] Furthermore, it is preferable that the side wings 110 in the rear wing area 117 decrease in size again in the direction of airflow towards the rear, following the maximum flare width. This is also shown in Figure 3. It is also possible that the center of gravity of the underside wing 112 of the side wings 110 is shifted towards the rear of the vehicle, as shown in Figure 3.

[0145] The side wings 110 are preferably pivotably mounted in the fuselage 10 about a pivot axis 115. Other mounting options for the side wings 110 are also conceivable, for example, a sliding guide or a pivoting guide with a shifting pivot axis of the side wings 110. Preferably, the pivot axis 115 is located at the front of the side wings 110 in the direction of airflow. This facilitates the pivoting of the side wings 110 during flight.

[0146] On their starboard and port sides, the side wings 110 are bounded by a wing edge 114, which preferably transitions the upper wing surface 113 into the lower wing surface 112 as a convex rounding. This prevents a sharp-edged transition that would pose a risk of injury.

[0147] Preferably, each side wing 110 can be connected to an actuator. Preferably, the actuators are coupled to the side wings 110 at the end facing the rear. The two actuators can be coupled to an actuating device. The actuating device can be manually operated, by means of which the two actuators and thus the two side wings 110 can be adjusted. Preferably, however, the actuating device is an electromechanical unit, which is preferably arranged centrally in the fuselage 10. However, it is also conceivable that each actuator, and thus each side wing 110, has its own electromechanical unit.

[0148] For underwater travel, the side wings 110 can be adjusted to the set position. When the submersible transitions from underwater to surface travel, the user can extend both side wings 110 to the operating position shown in Figure 2. Figure 2 illustrates that the two side wings 110 are located in the area of ​​the rear half of the submersible facing the stern 27.

[0149] Page 23 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0150] submersible vehicle, arranged so that they can generate optimal buoyancy during travel when in the deployed position.

[0151] To adjust the side wings 110 between the set and the extended position, it may be provided, for example, that a control element, such as a switch, is provided on one of the handles 24, by means of which the side wings 110 can be moved between their operating positions.

[0152] As can be seen in Figure 3, the side wings 110, in the extended operating position, preferably project beyond the contour of the fuselage 10 by a maximum lateral overhang 120. Preferably, the maximum lateral overhang 120 is at least 70 mm, but preferably at most 120 mm.

[0153] Preferably, at least one buoyancy fin is arranged projecting from the hull (not shown) to generate lift in the stern area of ​​the vessel 1 during ferry operation. In particular, two buoyancy fins can be provided in the stern area, one projecting to the starboard side and the other to the port side. Preferably, the buoyancy fins are arranged on the hull 30 and, more preferably, on the flow channel receptacle 38 in the area of ​​the bulge 39.3. To reduce the number of parts and the assembly effort, the buoyancy fins can be formed integrally with the flow channel receptacle 38. It is preferable that the buoyancy fins be arranged in the area of ​​the aft half of the vessel's length, preferably in the area of ​​the aft third of the vessel's length, in order to be effective.The arrangement of the lift wings can be such that they face the sliding surfaces 37.

[0154] As can be seen in Figures 1 to 5, a support body 200 can be connected to the watercraft 1. Preferably, the support body 200 is rigidly connected to the watercraft 1. In particular, the support body 200 can be detachably, i.e., interchangeably, connected to the watercraft 1. As shown in Figure 6

[0155] Page 24 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0156] As indicated by dashed lines in Figure 7, it may be provided that two spaced-apart profile sections 203 project from the support body 200. The longitudinal axes of the profile sections 203 may run in the direction of a central longitudinal axis of the watercraft 1 and / or the support body 200. Furthermore, it may be provided that plug-in sockets (not shown) are provided on or in the hull 10 of the watercraft 1, into which the profile sections 203 can be inserted. Suitable clamping means may be used to prevent the profile sections 203 from unintentionally detaching from the plug-in sockets.

[0157] As can be seen, for example, in Figures 3 and 4, the support body 200 has a top surface 201 and a bottom surface 210 opposite the top surface 201. The bottom surface 210 can form a continuation of the sliding surface 37 of the watercraft 1. As shown here, the bottom surface 210 can be essentially parallel to the sliding surfaces 37 of the watercraft and preferably lie in the same plane as them. This is particularly evident in Figure 5.

[0158] The support body 200 can have a top surface 201 and an opposing bottom surface 210. As can be seen particularly in Figure 6, the top surface 201 and the bottom surface 210 can be connected by an end face 220 at a forward end region of the support body 200 with respect to the direction of travel F. Opposite the end face 220, the top surface 201 and the bottom surface 210 can be connected by a rear surface 230 in the rear region of the support body 200. The rear surface 230 and the top surface 220 can in turn be connected to each other by longitudinal sides 240 provided on both sides of a central longitudinal plane 207 of the support body 200, which can also establish a connection between the top surface 201 and the bottom surface 210.

[0159] The upper surface 201 has a support surface 202 on which a user can rest parts of their body.

[0160] As further illustrated in Figure 6, the upper surface 201 can have a projection 204. The projection 204 can be such that at least parts of the upper surface

[0161] Page 25 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0162] The upper surface 201 is designed as inclined areas 205, which converge on the raised section 204. In this embodiment, the inclined areas 205 create an upward slope of the upper surface 201 in the direction of travel F. The raised section 204 can be located in a front area of ​​the upper surface 201, particularly adjacent to the end face 220, as shown here. According to the embodiment shown in the figures, two inclined areas 205 can be provided, arranged opposite each other with respect to the central longitudinal plane 207 of the support body 200. In addition to an incline along the direction of travel F, the inclined areas 205 can also have a mutual inclination perpendicular to the direction of travel F, thus creating a concave surface area. Preferably, such a concave surface area is part of the support surface 202. This ensures comfortable support and good lateral guidance of the user's body.

[0163] As can be seen, among other places, in Figure 4, the support body 200 has an air guide arrangement. The air guide arrangement is designed to guide air into the area of ​​the underside 210 when the support body 200 is moved along the water surface. As can be seen particularly with regard to Figure 4, the air guide arrangement can have at least one air channel 260. In this case, four air channels 260 are provided. Furthermore, the air guide arrangement can have an air guide element 250 that is open on its underside.

[0164] The air ducts 260 will first be described in more detail. As can be seen in Figure 4, each air duct 260 can have an air outlet 261. The air outlets 261 can open into the underside 210, in particular by means of openings in the underside 210. Each air outlet 261 can be connected to an air inlet 280 by means of a duct section 270.

[0165] According to the present embodiment, four air channels 260 can be provided, each arranged in pairs opposite the central longitudinal plane 207 of the support body 200. As can be seen in the figures, two air channels 260 can be located in a channel that is forward with respect to the direction of travel F.

[0166] Page 26 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0167] The area is provided for. Additionally, two further air ducts 260 may be provided further back with respect to the direction of travel F.

[0168] As can be seen in Figure 6, the front air ducts 260 can each have an air inlet 280, which is provided in the area of ​​the front face 220. As shown here, the air inlets 280 can open into the front face 220, in particular by being designed as an opening in the front face 220.

[0169] Figure 5 shows a sectional view in the plane V marked in Figure 3. It can be seen that the air inlet 280 of the support body 200 is located in the area of ​​one of the outlet openings 72 of the watercraft 1. In this case, the air inlet 280 is positioned such that it covers the outlet opening 72. Air can flow from the outlet opening 72 into the air inlet 280. The air can then be guided through the air inlet 280 into the channel section 270 and, via the channel section 270, to the air outlet 261.

[0170] Figure 5 also shows that the clear height 262 of the duct section 270 increases along a region adjoining the air inlet 280 towards the air inlet 280. In this case, the area of ​​increase is located between a transition section 271 of the duct section 270 and the air inlet 280.

[0171] In the top view according to Figure 7, the otherwise concealed parts of each front and rear air duct 260 are schematically shown as outlines in dashed lines. As can be seen in Figure 7, the clear opening 264 of the front air ducts 260 can also increase towards the air inlet 280.

[0172] Overall, it can therefore be provided that the cross-sectional area of ​​the duct section 270 increases along at least parts of a central longitudinal line of the duct section 270 towards the air inlet 280. According to the illustrated embodiment, a continuous increase can be provided. The area of ​​increase can function as a nozzle and accelerate the airflow.

[0173] Page 27 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0174] As can be seen in Figure 6, the rear air ducts 260 can each have an air inlet 280. According to the present embodiment, the air inlets 280 can be provided in the area of ​​the upper surface 201. As shown here, the air inlets 280 can open into the upper surface 201, in particular by forming an opening in the upper surface 201.

[0175] Figure 8 shows a sectional view along line VIII marked in Figure 7. It can be seen that a surface normal of the air inlet 280 of the rear air duct 260 has a directional component in the direction of travel F. Therefore, the airflow can be used to draw air into the air inlet 280. The air can then be directed through the air inlet 280 into the duct section 270 and, via the duct section 270, to the air outlet 261.

[0176] As can be seen from Figures 5 and 8, the channel sections 270 of both the front and rear air channels 260 can be formed, at least partially, within a base body 209 of the support body 200 between the upper surface 201 and the lower surface 210. In particular, according to the present embodiment, they can be formed completely within the base body 209.

[0177] As can be seen particularly in Figures 4 and 7, it can be provided for both the front and rear air ducts 260 that the width 263 of the air outlet 261 increases in the opposite direction of travel F. Preferably, the widening can be continuous. The width 263 can be measured perpendicular to the direction of travel F and perpendicular to a surface normal of a part of the underside 210 adjacent to the air outlet 261.

[0178] Figures 5 and 8 show that for both the front and rear air ducts 260, a distance 265 between an upper duct boundary 266 of the air duct 260 and the air outlet 261 decreases in the direction of travel F. Preferably, the decrease in the distance 265 can be continuous. In this way, a

[0179] Page 28 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0180] A more streamlined transition between channel section 270 and the underside 210 will be created.

[0181] Preferably, the air outlets 261 of the front air ducts 260 can be provided in the region of a front half of the length of the support body 200 when viewed along the direction of travel F. The air outlets 261 of the rear air ducts 260 can preferably be provided in the region of a rear half in this respect.

[0182] The air guidance arrangement of the support body 200 can further comprise an air guidance element 250 that is open on its underside, as can be seen, for example, in Figure 4. The air guidance element 250 can be formed by the shape of the underside 210. As in the present case, for example, it is conceivable that the air guidance element 250 is provided as a recess in the underside 210. In other words, the air guidance element 250 can be considered a channel that is open on one side or on its underside.

[0183] The recess can have an upper cover section 255, which is spaced at least partially apart from the lower surface 210. The cover section 255 can be essentially flat, as shown in the figures. It is also conceivable that the cover section 255 has a curve, in particular a concave curve. The cover section 255 can be bounded laterally, i.e., towards the longitudinal sides 240 of the support body 200, by side sections 256. Preferably, edge sections 257, which form the transitions between the cover section 255, the side sections 256, and the lower surface 210 of the support body 200, can be rounded or chamfered.

[0184] According to the illustrated embodiment, the recess can open into the end face 220 of the support body 200. In this way, an air inlet 254 of the air guide element 250 can be formed on the end face 220. Opposite the air inlet 254, the recess can transition in a transition area 258, for example, into the underside 210 of the support body 200.

[0185] Page 29 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0186] The air guide element 250 preferably extends over a length along the direction of travel F that is greater than half the length of the support body 200. Furthermore, the air guide element 250 can have a width 253 perpendicular to the direction of travel and parallel to a surface extension of the underside 210, the width of which is measured between the side sections 256. Preferably, the width 253 corresponds to at least one-third of the width of the support body 200.

[0187] Preferably, the depth 252 of the recess can decrease relative to the underside 210 of the support body 200 in the opposite direction of travel F, as can already be seen from Figure 4. In the sectional view of Figure 8, the otherwise concealed course of the air guide element 250 is shown as an outline in dashed lines. This makes the course, in particular of the depth 252, even clearer. As can be seen from the illustrated embodiment, the decrease in depth 252 can preferably be continuous.

[0188] As can be further seen from the figures, the air guide element 250 can be arranged in the area of ​​the central longitudinal plane 207 of the support body 200. In this case, the air guide element 250 is designed symmetrically with respect to the central longitudinal plane 207.

[0189] Figure 4 shows that the air inlet 254 of the air guide element 250 of the support body 200 can be arranged in the area of ​​one of the outlet openings 72 of the watercraft 1. In this embodiment, the air inlet 254 is arranged in the area of ​​an outlet opening 72 provided centrally in the stern area 27 of the watercraft 1. According to the present embodiment, the outlet opening 72 can partially enclose the outlet opening 72, and in particular, can completely enclose it except for the opening on the underside of the air guide element 250. The outlet opening 72 can, for example, be provided above the flow outlet 39. Air flowing out of the outlet opening 72 can be directed by means of the air guide element 250 to the underside 210 of the support body 200.

[0190] The embodiment shown in the figures thus demonstrates a water sports device comprising a watercraft 1 and a support body 200 (see in particular figures).

[0191] Page 30 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025

[0192] 1 and 2). The watercraft 1 has a hull 10 with a support on which a user can rest at least partially with their upper body. The support body 200 is coupled to the watercraft (1), in particular rigidly coupled. For this purpose, profile sections 203 (see Figures 6 and 7) can be provided on the support body 200, which can be received in plug-in sockets of the watercraft 1, as described above. The support body has an air guide arrangement designed to guide air into the area of ​​its underside 210 when it is moved along the water surface. The air guide arrangement can, for example, have at least one air channel 260 and / or at least one air guide element 250 open on the underside (see in particular Figure 4).In this way, friction losses on the underside 210 of the support body 200 can be significantly reduced, since the air directed to the underside 210 can act as a lubricant between the support body 200 and the water. Thus, for example, air bubbles present in the area of ​​the underside 210 due to the air directed to it can serve as a lubricant between the support body 200 and the water. Furthermore, by introducing air between the underside 210 and the water surface, shocks, such as those caused by waves on the water surface, can be dampened, resulting in smoother operation.

[0193] Page 31 of 36

Claims

Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025 Claims 1. Support body (200) for connection to a watercraft (1 ), with a top (201) and a bottom (210) opposite the top (201), wherein the support body (200) has a support surface (202) in the area of ​​the upper surface (201) on which a user can rest parts of his body, wherein the support body (200) is designed to be moved by the watercraft (1) in a direction of travel (F) along a water surface, characterized in that that the supporting body (200) has an air guidance arrangement designed to guide air into the area of ​​its underside (210) when it is moved along the water surface.

2. Support body (200) according to claim 1, characterized in that, that the air guidance arrangement has at least one air duct (260) which has an air inlet (280), an air outlet (261) and a duct section (270) connecting the air inlet (280) and the air outlet (261) in an air-conducting manner, that the air outlet (261) is provided in the area of ​​the underside (210), in particular opening into the underside (210), and that the air inlet (280) is preferably provided in the area of ​​a side (201 , 220, 230, 240) of the support body (200) different from the underside (210), in particular opening into this different side (201, 220, 230, 240).

3. Support body (200) according to claim 2, characterized in that, and that the air inlet (280) is provided in the area of ​​a front face (220) directed in the direction of travel (F) and / or in the area of ​​the upper surface (201) and / or in the area of ​​at least one longitudinal side (240) adjoining the front face (220), wherein a surface normal of the cross-sectional area of ​​the air inlet (280) preferably has at least one directional component in the direction of travel (F) in order to guide air over the air inlet (280) into the channel section (270) by utilizing a driving wind. Page 32 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025 4. Support body (200) according to claim 2 or 3, characterized in that, that the channel section (270) is formed at least partially within a base body (209) of the support body (200) between the top (201) and the bottom (210).

5. Support body (200) according to one of claims 2 to 4, characterized in that a width (263) of the air outlet (261) increases against the direction of travel (F), preferably continuously, wherein the width (263) extends perpendicular to the direction of travel (F) and perpendicular to a surface normal of a part of the underside (210) adjacent to the air outlet (261).

6. Supporting body (200) according to one of claims 2 to 5, characterized in that a cross-sectional area of ​​the channel section (270) increases along at least areas of a central longitudinal line of the channel section (270) towards the air inlet (280), preferably continuously.

7. Support body (200) according to one of claims 1 to 6, characterized in that the air guidance arrangement has at least one air guidance element (250) open on the underside.

8. Support body (200) according to claim 7, characterized in that, that the air guide element (250) is formed by the shaping of at least one section of the underside (210) of the support body (200), wherein the air guide element (250) preferably comprises a recess opposite the underside (210) of the support body (200), wherein the recess opens in particular into an end face (220) of the support body (200) directed in the direction of travel (F) and forms an air inlet (254) of the air guide element (250) there.

9. Supporting body (200) according to claim 8, characterized in that, Page 33 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025 that the depth (252) of the recess decreases relative to the underside (210) of the support body (200) in the opposite direction of travel (F), preferably continuously.

10. Support body (200) according to claim 1, characterized in that, that the air guidance arrangement comprises at least two air channels (260) according to one of claims 2 to 6, which are arranged on both sides of a central longitudinal plane (207) of the support body (200), preferably comprising four air channels (260), of which two are arranged on each side of a central longitudinal plane (207) of the support body (200), and / or that the air guidance arrangement comprises at least one air guidance element (250) according to one of claims 7 to 9, which is arranged in the region of the central longitudinal plane (207) of the support body (200), in particular being symmetrical to the central longitudinal plane (207).

11. Water sports equipment comprising a watercraft (1) and a support body (200) according to any one of claims 1 to 10, wherein the watercraft (1) has a hull (10) with a support on which a user can at least partially rest his upper body, and wherein the support body (200) is coupled to the watercraft (1), in particular rigidly coupled.

12. Water sports equipment according to claim 11, characterized in that, that the watercraft (1) has one or more outlet openings (72) designed to provide an air-conducting connection between an interior of the hull (10) of the watercraft (1) and the environment, directly or indirectly, and that the supporting body (200) is designed and arranged to guide air exiting from the interior of the fuselage (10) through one of the outlet opening(s) (72) into the area of ​​the air guidance arrangement.

13. Water sports equipment according to claim 12, characterized in that Page 34 of 36 Applicant: CAYAGO TEC GmbH Our reference: A 31673-PCT Date: 27.10.2025 that the air inlet (254) of the air guide element (250) of the support body (200) is arranged in the area of ​​the outlet opening(s) (72) of the watercraft (1) in order to allow an airflow from the outlet opening (72) to the underside (210) of the support body (200).

14. Water sports equipment according to claim 12 or 13, characterized in that that the air inlet (280) of the air duct (260) of the support body (200) is arranged in the area of ​​the outlet opening(s) (72) of the watercraft (1) in order to allow an airflow from the outlet opening (72) via the air inlet (280) into the duct section (270) of the air duct (260).

15. Water sports equipment according to one of claims 11 to 14, characterized in that the watercraft (1) has at least one sliding surface (37) on its hull (10) which is designed and arranged to enable the watercraft (1) to glide on the water surface, and that the underside (210) of the support body (200) forms a continuation of the sliding surface (37), in particular is at least partially aligned parallel to it, and is most preferably at least partially in a common plane with it. Page 35 of 36

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