Watercraft

Abstract

The invention relates to a watercraft comprising a hull (0) comprising a stern (1), a bow (2), and a hull bottom (3) having a stem (4) extending along a longitudinal axis (6) of the hull bottom between the bow and the stern. A propeller (5) is housed, at the stern, in a housing (8). The stem (4) is followed, towards the stern, by the housing and, between the stem and the housing, there is a water intake duct (7) leading towards the housing. The hull bottom comprises recesses respectively forming a first and a second rail (10a, 11a), a first and a second passage (12a, 13a), a first and a second symmetrical rail (10b, 11b), a first and a second symmetric passage (12b, 13b). The hull bottom comprises a screen covering the housing between a water intake opening (16a) admitting water from the water intake duct, and a water outlet opening (16b).

Description

[0001] "Boat"

[0002] TECHNICAL FIELD

[0003] The present invention relates to the field of boats. It finds particularly advantageous application in the field of hull design and in particular hull design with a view to optimizing the hydrodynamic performance of the hull.

[0004] STATE OF THE ART

[0005] There are several technical solutions using hulls, and in particular hulls with specific shapes designed to control the hydrodynamic physical phenomena (friction forces and pressure forces) acting on the hull and having the consequences of creating resistance to forward movement as well as discomfort for users. More specifically, the problems of maintaining the course and stability during tight turns can be cited.

[0006] In this context, we can present the technical solution of document US7544109 which concerns a boat provided with a recess at the stern of the boat allowing a turbine to be received so as to limit the friction and pressure forces acting on the turbine opposing the advancement of the boat.

[0007] However, this type of solution has drawbacks, notably the fact that it does not allow sufficient control of hydrodynamic physical phenomena.

[0008] An object of the present invention is therefore to provide a boat making it possible to overcome at least part of the disadvantages cited. The other objects, characteristics and advantages of the present invention will appear on examining the following description and the accompanying drawings. It is understood that other advantages may be incorporated.

[0009] SUMMARY

[0010] To achieve this objective, according to one embodiment, a boat is provided comprising a hull comprising:

[0011] - a stern,

[0012] - a bow and

[0013] - a hull having a stem extending along a longitudinal axis of the hull between the bow and the stern, the boat further comprising a propeller housed, at the stern, in a housing centered on the longitudinal axis of the hull, the stem being followed towards the stern by a hollow zone in the hull forming the housing and, between the bow and the housing, a water intake conduit towards the housing, the boat being characterized in that the hull comprises recesses, extending in the direction of the longitudinal axis, forming respectively, a first rail, a second rail, a first corridor and a second corridor, the second corridor being positioned between the first corridor and the longitudinal axis, and the second rail and the first rail being respectively positioned between the first corridor and the second corridor and in contact with the first corridor opposite the second rail relative to the first corridor,the hull further comprising recesses, extending in the direction of the longitudinal axis, respectively forming a first symmetrical rail, a second symmetrical rail, a first symmetrical corridor and a second symmetrical corridor, the first symmetrical rail, the second symmetrical rail, the first symmetrical corridor and the second symmetrical corridor being respectively symmetrical with respect to a median plane of the hull, passing through the longitudinal axis, of the first rail, the second rail, the first corridor and the second corridor and the boat being further characterized in that the hull comprises a screen covering the housing between a water intake mouth into the housing from the water intake conduit and a water outlet mouth out of the housing.,

[0014] Thus, the presence of recesses at the level of the hull makes it possible to create zones between the surface of the water and the hull in which a mixture of water with air has the role of creating a cushioning during the advancement of the boat resulting in an increase in comfort for users who will feel less shocks, this in particular when entering the water of the boat. The mixture in question is due to the presence of a layer of air trapped between the surface of the water and the hull as well as that of waves on which the boat advances. Added to the increase in user comfort, these recesses, due to the accumulation of the resulting air-water mixture, make it possible to limit the formation of water projections upstream and downstream of the boat and on each side of the boat (this whatever the state of the surface of the body of water).Indeed, the water, which would initially have been projected, is then trapped in the recesses, this resulting in a reduction of the friction forces acting on the surfaces of the hull and thus better course maintenance and better stability during tight turns (this is particularly the case in rough seas or with a sea presenting boat wakes), an increase in the sliding phenomenon and propulsion (therefore leading to better propulsion efficiency and therefore increasing the speed by 20% to 30% for the same power generated), a reduction in the sinking during the descent of waves, a reduction in the time taken for planing to appear for the same power generated and a reduction of 20% to 30% in energy consumption.It is important to note that due to the configuration of the rails (concave arc-shaped) according to the invention, a reasonable increase in the weight of the boat results in little or no increase in fuel consumption. The present invention also makes it possible to simplify the geometry as well as the handling of the boat, in particular by eliminating the need to position sponsons (on jet skis in particular), fins (on surfboards in particular), foils (on surfboards in particular, which required a significant water height and could constitute a danger for swimmers and marine life) and anchors or to make adjustments (when driving). Indeed, the configuration of the hull according to the invention allows scooters in particular to make tight turns and to cause less drag (compared to what sponsons allow), thus making the use of sponsons on scooters superfluous.In addition, the corridors act as stiffeners for the hull, thus simplifying the areas occupied by heavy elements such as the engine, fuel tank or batteries. The screen protects the propeller from friction and pressure forces coming from below the propeller, which optimizes the operation of the propeller and therefore creates better propulsion. All of these characteristics therefore make it possible to control, in a more significant and simplified way, the hydrodynamic physical phenomena so that they have less impact on the propulsion of the boat as well as the comfort of users.

[0015] According to another aspect, the invention relates to a boat in which the first corridor and the second corridor are respectively, with the first symmetrical corridor and the second symmetrical corridor, carried, respectively, by a first V and by a second V.

[0016] This configuration makes it possible to give the hull an overall V-shape, thus providing stability to the boat due to the position of the boat's center of gravity relative to the hull metacenter. Furthermore, a V-shaped hull (compared, for example, to a rectangular or rounded rectangular hull) will make it possible to achieve higher speeds for the same power generated, in particular due to the reduction in the external surface area of ​​the hull, thus reducing the friction forces of the water acting on the hull. According to another aspect, the invention relates to a boat in which the first rail and the second rail form arcs of a circle and the first corridor and the second corridor form flat surfaces.

[0017] Due to the arcuate shape of the first and second rails separated by the first and second corridors forming flat surfaces, a better accumulation of the air-water mixture is achieved in the hull, thus leading to a strengthening of the resulting technical effects. BRIEF DESCRIPTION OF THE FIGURES

[0018] The aims, objects, as well as the characteristics and advantages of the invention will emerge more clearly from the detailed description of an embodiment thereof which is illustrated by the following accompanying drawings in which:

[0019] Figure 1 shows the electric surfboard from a stern-facing view.

[0020] Figure 2 shows a cross-section of the electric surfboard hull highlighting the shapes and inclinations of the corridors and rails.

[0021] Figure 3 shows the electric or thermal jet ski from a view facing the bow.

[0022] Figure 4 shows a bottom view of the electric or thermal jet ski.

[0023] Figure 5 shows a side view of the electric surfboard.

[0024] Figure 6 shows a bottom view of the electric surfboard.

[0025] Figure 7 shows the electric or thermal jet ski from a view facing the stern.

[0026] The drawings are given by way of example and are not limiting of the invention. They constitute schematic representations of principle intended to facilitate the understanding of the invention and are not necessarily to the scale of practical applications.

[0027] DETAILED DESCRIPTION

[0028] Before commencing a detailed review of embodiments of the invention, optional features which may optionally be used in combination or alternatively are set out below.

[0029] According to an example, the recesses 14a, 14b, 14c, 14d, 14e, 14f, 14g, 14h of the boat are contiguous two by two.

[0030] This configuration eliminates protruding areas of the hull to allow the corridors to direct the air-water mixture directly to the rails without encountering any obstacles.

[0031] According to one example, the first V 15a and the second V 15b define angles less than or equal to 140° and preferably greater than or equal to 80°.

[0032] Thus, these angle values ​​make it possible to obtain the best compromise (for the same hull width) between a stable hull configuration and a shallow hull, thus avoiding damage to the hull in shallow water.

[0033] In one example, the first V 15a defines an angle greater than an angle defined by the second V 15b.

[0034] This configuration serves to maintain the overall V shape of the hull.

[0035] According to one example, the water intake conduit 7 has a rectilinear shape and the stem 4 forms with the water intake conduit 7 an angle less than or equal to 20° and preferably greater than or equal to 5°.

[0036] The rectilinear shape of the water intake conduit 7 makes it possible to constitute a progressive water flow zone having an inclination substantially parallel to the directions of the flow of the water likely to reach the water intake conduit 7. This configuration makes it possible to reduce the obstacles in the passage of the water and therefore the friction, which results in a limitation of the expenditure of energy to move forward.

[0037] According to one example, the screen 9 has a projecting position relative to the bow 4. This configuration is necessary to ensure that the water present at the water intake mouth 16a can reach the propeller 5 in significant quantity while having an inclination of the water intake mouth 16a respecting the flow lines of the water initially present at the bow 4.

[0038] According to one example, the projecting positioning of the screen 9 relative to the bow 4 is of a value less than or equal to 10 cm and preferably greater than or equal to 3 cm.

[0039] According to an example, screen 9 is flat.

[0040] Thus, this inclination has the function of limiting the pressure and friction forces acting on the areas located between the screen 9 and the bow 4.

[0041] According to one example, the screen 9 has, at the level of the water intake mouth 16a, a concavity oriented towards the bow 4.

[0042] This concavity makes it possible to limit the pressure force of the water acting on the surface of the screen 9 having the concavity. Indeed, thanks to the concavity, the pressure applied will be distributed over the concave surface in such a way that the same pressure is applied over a longer time than if the screen 9 did not have this concave surface, this resulting in a pressure felt per unit of time that is less.

[0043] According to one example, the screen 9 is joined to the hull 3, by a third rail 18a and by a third symmetrical rail 18b, extending in the direction of the longitudinal axis 6, from the water outlet mouth 16b to the bow 4.

[0044] Thus, due to the presence of these third rails, the air accumulating between the second rail 11 a and the second symmetrical rail 11 b cannot reach the water intake duct 7. This configuration therefore makes it possible to prevent air from circulating in the water intake duct 7 and from disrupting the optimal operation of the propeller.

[0045] According to one example, the boat comprises a motor and the propeller 5 is connected to the motor by a shaft 17, the motor being positioned, in contact with a part of the hull 0 not exposed to the water, at the junction between the bow 4 and the water intake conduit 7.

[0046] According to one example, the bow 2 has a hollow zone 19 at the level of the hull 3. This configuration makes it possible to form a water blocking zone to limit the upwelling of water which could have reached the top of the bow 2 with significant pressure.

[0047] The upwelling in question has the effect of slowing down the boat for the same power generated.

[0048] According to one example, the first lane 12a and the second lane 13a have a width, defined at the water inlet mouth 16a in a direction orthogonal to the direction along the longitudinal axis 6, having a value greater than twice a width, defined at the water inlet mouth 16a in a direction orthogonal to the direction along the longitudinal axis 6, of the first rail 10a and the second rail 11a and preferably, having a value less than ten times the width of the first rail 10a and the second rail 11a and preferably the width of the second lane 13a is greater than that of the first lane 12a.

[0049] Thus, these different configuration possibilities make it possible to obtain configurations for which the corridors whose role is to direct the air-water mixture towards the rails have significant widths or smaller widths and this in comparison with the radii of the arc of the rails. In the case of configurations where the widths of the corridors are small, this results in large radii of the arc of the rails. This type of configuration has the consequence of allowing a significant accumulation of the air-water mixture (in the rails) and therefore of obtaining significant damping of the shocks suffered by the boat. In the opposite case, where the widths of the corridors are large compared to those of the rails, the opposite phenomena occur.

[0050] Furthermore, the relative choice of the width of the corridors compared to that of the rails has an influence on the stability of the hull. Indeed, a small width of corridors results, for the same hull width, in rails having a larger radius, which accentuates the stability due to the V shape of the hull, by creating larger hollows in the hull.

[0051] The fact that the width of the second corridor 13a is greater than that of the first corridor 12a makes it possible to create areas of accumulation of the air-water mixture close to the hull exposed to the air, which makes it possible to channel a maximum of this mixture before it creates friction forces on the hull.

[0052] According to one example, the second corridor 13a has a depth of less than 8 cm and preferably greater than 0 cm and in which the first corridor 12a has a depth of less than 8 cm and preferably greater than 0 cm.

[0053] Thus, these different configurations make it possible to obtain a V-shaped hull having different overall angles and different hull volumes (for the same overall angle) to thus define the desired hull stability. These different configurations also make it possible to obtain different volumes of accumulated air-water mixture and therefore to vary the desired damping. The overall angle is formed by the straight line joining the first rail 10a and the screen 9 with the straight line joining the first symmetrical rail 10b and the screen 9.

[0054] The developed boat, due to the characteristics that limit friction, allows for a propulsion system that limits the power generated.

[0055] It is specified that in the context of the present invention, the expression "carried by a V" relating to two planes means that the two planes are intersecting and that their intersection forms an angle different from 180° and 0°.

[0056] The term "boat" means a sailing, rowing or motor boat such as an "electric surfboard", jet ski, rowboat, pleasure boat, fireboat or fishing boat.

[0057] In the context of the present invention, the term "bow" designates the projecting part forming at least in part the prow of a boat. The bow extends along the lowest part of the hull towards the stern. The bow may have a V shape carried by an angle which may in particular be less than 140°. The term "low" must be taken into account by considering the usual direction of use of a watercraft, the bottom being opposed to the top.

[0058] According to one embodiment, as illustrated in Figure 4, the boat comprises a hull 0 comprising a stern 1, a bow 2, and a hull 3. The hull 3 has a stem 4 which extends along a longitudinal axis 6 of the hull 3 while being positioned between the bow 2 and the stern 1. The boat further comprises a propeller 5 inserted, at the stern 1, in a housing 8 positioned at the center of the longitudinal axis 6 of the hull 3. The stem 4 is followed towards the stern 1 by a zone hollowed out in the hull 3 forming the housing 8 and, between the stem 4 and the housing 8, a water intake conduit 7 towards the housing 8.

[0059] The hull 3 comprises recesses 14a, 14b, 14c, 14d, extending in the direction of the longitudinal axis 6, forming respectively, a first rail 10a, a second rail 11a, a first corridor 12a and a second corridor 13a. The second corridor 13a is connected to the first corridor 12a and to the longitudinal axis 6. The second rail 11a is connected to the first corridor 12a and to the second corridor 13a. The first rail 10a is connected to the first corridor 12a opposite the second rail 11a with respect to the first corridor 12a.

[0060] The hull 3 further comprises recesses 14e, 14f, 14g, 14h, extending in the direction of the longitudinal axis 6, respectively forming a first symmetrical rail 10b, a second symmetrical rail 11b, a first symmetrical corridor 12b and a second symmetrical corridor 13b. The first symmetrical rail 10b, the second symmetrical rail 11b, the first symmetrical corridor 12b and the second symmetrical corridor 13b being respectively symmetrical with respect to a plane, passing through the longitudinal axis 6, separating the hull 3 into two equal parts, from the first rail 10a, from the second rail 11a, from the first corridor 12a and from the second corridor 13a.

[0061] The hull 3 comprises a screen 9 enclosing the housing 8, on one side, between a water inlet mouth 16a into the housing 8 from the water inlet conduit 7 and a water outlet mouth 16b outside the housing 8.

[0062] Indeed, the positioning of the propeller 5 in the housing 8 allows the boat to be used as a rescue boat capable of navigating in shallow waters, unlike current boats used by firefighters during floods.

[0063] The size of the screen 9 can be set to create a gap between the propeller 5 and the screen of 1 mm.

[0064] The length of the water intake pipe 7 may be between 20% and 35% of the total length of the boat.

[0065] The propeller 5 can be a specific propeller (but different from a turbine propeller which operates with a compression cone) which can operate by being housed in a hollow space of cylindrical shape. Its flow must be straightened by a flow straightener.

[0066] The inlet of the water intake duct 7 may be provided with a grid in order to prevent various objects from passing into the water intake duct 7 to reach the propeller 5.

[0067] Preferably, the recesses 14a, 14b, 14c, 14d, 14e, 14f, 14g, 14h are separated from each other by a border having a width of at least 2 mm (for example 7 mm).

[0068] Advantageously, the first rail 10a and the second rail 11a define a rounded contour corresponding to arcs of a circle. This rounded contour can be configured so that the hollow area defined by this contour is in contact with the water. Preferably, the first rail 10a and the second rail 11a each define a rounded (or curved) contour forming a concavity in the shape of an arc of a circle. The term "element forming a concavity" means an element having a curved or rounded shape towards the inside. The first rail 10a and the second rail 11a can describe quarter circles with a variation of 20% to 60% of the length of the arc. Preferably, the first corridor 12a and the second corridor 13a describe flattened surfaces. The concave shape in the shape of an arc of a circle of the first rail 10a and the second rail 11a makes it possible to form an accumulation zone for the air-water mixture in the hull.This accumulation zone results in significant absorption of the shocks suffered by the boat, resulting in greater comfort for users. Also, the air-water mixture makes it easier for the hull to slide on the water, because the air microbubbles prevent a significant portion of the friction of the water on the hull when it moves forward. In addition, since the air contained in the air-water mixture remains in the rails due to their shape, the configuration of the rails according to the invention allows for a better supply of water (i.e. without air) to the propulsion system.

[0069] The concave arc-shaped shapes of the rails 10a and 11a have respectively at the end not connected to a corridor (for the rail 10a) and at the end connected to the corridor 12a (for the rail 11a) a projecting zone whose role is to effectively retain the air-water mixture.

[0070] For electric surfing, as illustrated in Figure 2, the second corridor 13a and the second symmetrical corridor 13b may have two flat surfaces (extending in the direction of the longitudinal axis 6) connected to each other by a rounded surface along the axis transverse to the longitudinal axis 6 (also extending in the direction of the longitudinal axis 6).

[0071] In an advantageous embodiment, the first corridor 12a and the second corridor 13a describe respectively with the first symmetrical corridor 12b and the second symmetrical corridor 13b, respectively, a first V 15a and a second V 15b.

[0072] Together with the flat shape of the corridors 12a and 13a associated with the concave arcuate shape of the rails 10a and 11b, the overall V shape of the hull allows the air-water mixture (accumulated in the rails 10a and 11b) to rise more easily towards the rails to prevent it from going towards the propeller.

[0073] Preferably, the first V 15a and the second V 15b are characterized by angles less than or equal to 140° and preferably greater than or equal to 80°.

[0074] Advantageously, the first V 15a is characterized by an angle greater than an angle characterizing the second V 15b.

[0075] The angles of the first V 15a and the second V 15b vary according to the position on the longitudinal axis 6. The angle of the first V 15a is smaller by 20 to 30° towards the bow 2 so that the stability of the hull is greater at the bow 2 than the stern 1.

[0076] According to a preferred embodiment, the water inlet conduit 7 describes an elongated shape extending along the longitudinal axis 6.

[0077] Advantageously, the stem 4 is oriented relative to the water intake conduit 7 so that the stem 4 and the water intake conduit 7 form an angle less than or equal to 20° and preferably greater than or equal to 5°.

[0078] Preferably, the screen 9 projects from the bow 4.

[0079] Preferably, the screen 9 protrudes beyond the bow 4 by a value less than or equal to 10 cm and preferably greater than or equal to 3 cm.

[0080] According to one possibility, the screen 9 is flat. Advantageously, the second part 9b has, at the level of the water intake mouth 16a, a concavity oriented towards the bow 4.

[0081] According to a preferred embodiment, the screen 9 is secured to the hull 3, by a third rail 18a and by a third symmetrical rail 18b, extending in the direction of the longitudinal axis 6, from the water outlet mouth 16b to the bow 4.

[0082] Preferably, the propeller 5 is secured to a motor by a shaft 17. The motor is located, in a space formed by a part of the hull 0 not exposed to water, at the junction between the bow 4 and the water intake duct 7.

[0083] Once in the water intake duct 7, the water flow is oriented substantially in the same direction as the shaft 17, this in order to allow the optimal operation of the propeller 5 due to the orientation of its blades.

[0084] The motor may be an electric motor and may be powered by an electric battery equipped with a variator to vary the motor's power and direction of rotation. The boat's propulsion system may be a waterjet system.

[0085] The electric motor has the advantage of limiting startup problems. The propulsion system allows the boat to travel in very shallow water and to perform automatic and safe forward and reverse movements.

[0086] The electric motor can rotate in both directions to simplify maneuvering.

[0087] The engine can operate at a power of 10 KW or more (e.g. 120 KW) so that the boat reaches a speed of 20 km / h or more (e.g. 70 km / h) with an autonomy of approximately 2 hours, both in forward and reverse gear.

[0088] The shaft can be made up of a system passing through the hull in a sealed manner and allowing its rotation.

[0089] The boat may include at the outlet of the propulsion tube, that is to say at the stern, a system for steering the boat, such as a rudder or a steerable tube positioned behind the propeller 5 so as to direct the flow of water (in this case, straightening the flow is not necessary).

[0090] Advantageously, the bow 2 has a hollow zone 19 at the level of the hull 3.

[0091] The hollow zone 19 may have a depth of 3 to 8 cm, the depth being defined in a direction along the longitudinal axis 6.

[0092] For the electric or thermal jet ski, as illustrated in figures 3 and 4, the boat may include a towing ring 20.

[0093] Advantageously, the first corridor 12a and the second corridor 13a have a width, defined at the water inlet mouth 16a in a direction orthogonal to the direction along the longitudinal axis 6, having a value greater than twice a width, defined at the water inlet mouth 16a in a direction orthogonal to the direction along the longitudinal axis 6, of the first rail 10a and the second rail 11a. Preferably, the width of the first corridor 12a and the second corridor 13a is less than ten times the width of the first rail 10a and the second rail 11a. In a preferred embodiment, the second corridor 13a is wider than the first corridor 12a.

[0094] For the electric or thermal jet ski illustrated in figure 4 and for the electric surfboard, illustrated in figure 6, the width of the second symmetrical rail 11 b and the second rail 11 a decreases as one approaches the bow 2. The second symmetrical rail 11 b and the second rail 11 a extend along the longitudinal axis 6 to a point located at a distance of between 20 cm and 35 cm from the bow 2.

[0095] For the electric or thermal jet ski, illustrated in Figure 4 and for the electric surfboard, illustrated in Figure 6, at a distance from the bow 2 of between 25 cm and 60 cm, the first lane 12a and the first symmetrical lane 12b have a width which decreases as one approaches the bow 2 following the curvature of the hull 0 at the bow 2. The second lane 13a and the second symmetrical lane 13b have a constant width from the stern 1 to the bow 2. The first rail 10a and the first symmetrical rail 10b have a width which decreases as one approaches the bow 2 following the curvature of the hull 0 at the bow 2. The first rail 10a and the first symmetrical rail 10b start at a distance of between 60 cm and 120 cm from the bow. The first rail 10a and the first symmetrical rail 10b have a depth which increases from the bow 2 to the stern 1 and which is between 0 and 8 cm.

[0096] As for the electric surfboard illustrated in Figure 6, the total width of this boat can be between 60 cm and 75 cm. Its length can be between 150 cm and 300 cm. Its thickness at the front can be between 5 cm and 15 cm and at the rear between 15 cm and 30 cm.

[0097] For the electric or thermal jet ski, shown diagrammatically in Figure 4, the total width of this boat can be between 90 cm and 130 cm. The width between the second rail 11 a and the second symmetrical rail 11 b can be between 40 cm and 60 cm. The width of the screen 9 can be between 15 cm and 40 cm, in particular to ensure the modification of the orientation of the water flow.

[0098] In the case where the electric surf boat is a rescue boat for firefighters, the boat may include a removable tow bar. The boat may also include wheels, with a diameter of 40 to 60 cm, allowing movement at a wide range of speeds, so as to reduce the time taken to access and launch the boat, particularly in major emergency situations. These wheels may be retractable when entering the water. Thus, the hull 0 may have hollowed-out areas to conceal the wheels. The bars connecting the wheels may be equipped with a spring shock absorber system. The boat may also include road signal lights. This type of configuration may also consist of a fishing boat, equipped accordingly, in order to avoid towing problems in particular.

[0099] The lifeboat may be between 300 cm and 500 cm long and between 150 cm and 250 cm wide with a freeboard of 45 to 70 cm.

[0100] The boat may include a tow bar for towing, connected to the hull 0 by a removable pin. The hull material may be composite or polymer.

[0101] The invention is not limited to the embodiments previously described and extends to all embodiments covered by the invention.

[0102] List of references

[0103] 0. Shell

[0104] 1. stern

[0105] 2. bow

[0106] 3. hull

[0107] 4. bow

[0108] 5. propeller

[0109] 6. longitudinal axis

[0110] 7. water inlet pipe

[0111] 8. accommodation

[0112] 9. screen

[0113] 10a. first rail

[0114] 10b. first symmetrical rail l la. second rail ll b. second symmetrical rail

[0115] 12a. first corridor

[0116] 12b. first symmetrical corridor

[0117] 13a. second corridor

[0118] 13b. second symmetrical corridor

[0119] 14a, 14b, 14c, 14d, 14e, 14f, 14g, 14h. recesses

[0120] 15a. first V

[0121] 15b. second V

[0122] 16a. water inlet mouth

[0123] 16b. water outlet mouth

[0124] 17. tree

[0125] 18a. third rail

[0126] 18b. symmetrical third rail

[0127] 19. hollow area

[0128] 20. towing ring

Claims

Claims 1 . A boat comprising a hull (0) comprising a stern (1), a bow (2), and a hull (3) having a stem (4) extending along a longitudinal axis (6) of the hull (3) between the bow (2) and the stern (1), the boat further comprising a propeller (5) housed, at the stern (1), in a housing (8) centered on the longitudinal axis (6) of the hull (3), the stem (4) being followed towards the stern (1) by a hollow zone in the hull (3) forming the housing (8) and, between the stem (4) and the housing (8), a water intake conduit (7) towards the housing (8), the hull (3) comprising recesses (14a, 14b, 14c, 14d), extending along the direction of the longitudinal axis (6), respectively forming a first rail (10a), a second rail (11a), a first corridor (12a) and a second corridor (13a), the second corridor (13a) being positioned between the first corridor (12a) and the longitudinal axis (6),and the second rail (11 a) and the first rail (10a) being respectively positioned between the first corridor (12a) and the second corridor (13a) and in contact with the first corridor (12a) opposite the second rail (11 a) relative to the first corridor (12a), the hull (3) further comprising recesses (14e, 14f, 14g, 14h), extending in the direction of the longitudinal axis (6), respectively forming a first symmetrical rail (10b), a second symmetrical rail (11 b), a first symmetrical corridor (12b) and a second symmetrical corridor (13b), the first symmetrical rail (10b), the second symmetrical rail (11 b), the first symmetrical corridor (12b) and the second symmetrical corridor (13b) being respectively symmetrical relative to a median plane of the hull (3), passing through the longitudinal axis (6), of the first rail (10a), of the second rail (11 a),of the first corridor (12a) and the second corridor (13a) and the hull (3) further comprising a screen (9) covering the housing (8) between a water inlet mouth (16a) into the housing (8) from the water inlet conduit (7) and a water outlet mouth (16b) out of the housing (8) characterized in that the first rail (10a) and the second rail (11a) each define a rounded contour forming a concavity in the shape of an arc of a circle and in which the first corridor (12a) and the second corridor (13a) form flat surfaces, in that the first corridor (12a) and the second corridor (13a) are respectively with the first symmetrical corridor (12b) and the second symmetrical corridor (13b), carried, respectively, by a first V (15a) and by a second V (15b), and in that the screen (9) is flat.

2. Boat according to the preceding claim in which the first V (15a) and the second V (15b) define angles less than or equal to 140° and preferably greater than or equal to 80°.

3. Boat according to either of the two preceding claims in which the first V (15a) defines an angle greater than an angle defined by the second V (15b).

4. Boat according to any one of the preceding claims in which the recesses (14a, 14b, 14c, 14d, 14e, 14f, 14g, 14h) are contiguous two by two.

5. Boat according to any one of the preceding claims in which the water intake conduit (7) has a rectilinear shape and in which the bow (4) forms with the water intake conduit (7) an angle less than or equal to 20° and preferably greater than or equal to 5°.

6. Boat according to any one of the preceding claims in which the screen (9) has a projecting position relative to the bow (4).

7. Boat according to the preceding claim in which the projecting positioning of the screen (9) relative to the bow (4) is of a value less than or equal to 10 cm and preferably greater than or equal to 3 cm.

8. Boat according to any one of the preceding claims in which the screen (9) has, at the level of the water intake mouth (16a), a concavity oriented towards the bow (4).

9. Boat according to any one of the preceding claims in which the screen (9) is joined to the hull (3), by a third rail (18a) and by a third symmetrical rail (18b), extending in the direction of the longitudinal axis (6), from the water outlet mouth (16b) to the bow (4).

10. Boat according to any one of the preceding claims comprising a motor and in which the propeller (5) is connected to the motor by a shaft (17), the motor being positioned, in contact with a part of the hull (0) not exposed to the water, at a junction between the bow (4) and the water intake conduit (7).

11. Boat according to any one of the preceding claims in which the bow (2) has a hollow zone (19) at the level of the hull (3).

12. A vessel according to any one of the preceding claims wherein the first lane (12a) and the second lane (13a) have a width, defined at the water intake mouth (16a) in a direction orthogonal to the direction along the longitudinal axis (6), having a value greater than twice a width, defined at the water intake mouth (16a) in a direction orthogonal to the direction along the longitudinal axis (6), of the first rail (10a) and the second rail (11a) and preferably, having a value less than ten times the width of the first rail (10a) and the second rail (11a) and preferably the width of the second lane (13a) is greater than that of the first lane (12a).

13. A vessel according to any one of the preceding claims in which the second corridor (13a) has a depth of less than 8 cm and preferably greater than 0 cm and in which the first corridor (12a) has a depth of less than 8 cm and preferably greater than 0 cm.

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