Sailing boat

Abstract

A sailboat (1), in particular a freight sailboat, comprising a sail (3) and a mounting element (2) wherein the sail (3) is fixed outside the sailboat (1) by means of the mounting element (2), the mounting element (2) being configured to rotate the sail (3) about a first axis of rotation (6), in a working position of the sail (3), the first axis of rotation (6) being substantially parallel to a vertical axis (7) of the sailboat (1), the cross-sectional area of the sail (3) along its first portion (4) decreases as the distance from the mounting element (2) increases, and the cross-sectional area of the sail (3) along its second portion (5) increases as the distance from the mounting element (2) increases, where the second portion (5) is arranged between the mounting element (2) and the first portion (4). The invention also relates to a sail (3) and to a method for orienting a sail (3).

Description

Technical Field

[0001] The present invention relates to a sailing vessel, in particular a cargo sailing vessel, comprising a sail and a mounting element, wherein the sail is fixed to the outside of the sailing vessel by the mounting element, the mounting element being configured to enable the sail to rotate about a first rotation axis, wherein in an operating position of the sail, the first rotation axis is substantially parallel to a vertical axis of the sailing vessel, and wherein a cross-sectional area of ​​the sail decreases along a first section of the sail as the distance from the mounting element increases. The present invention also relates to a sail and a method for aligning a sail. Background Art

[0002] Sails for sailboats known in the art are typically made of canvas, which can include fabric and / or plastic. Aligning the canvas with the wind can be challenging. In strong winds, it may be necessary to reef the sail to prevent damage and excessive heeling. This means reducing the sail area, for example by furling it.

[0003] Wing sails are also known and are easier to adjust than sailcloth sails. EP 0 989 939 B1 discloses a wing sail in which the mast is surrounded by a sailcloth cover, forming a double-sided sail with a flexible surface. US 10,633,057 B1 shows a wing sail made of fabric or plastic material and fitted over an internal frame. FR 2 349 494 A1 also describes a wing sail. To adjust the sail, in its operational state, it can be rotated about an axis of rotation parallel to the vertical axis of the sailboat.

[0004] European patent EP 2 420 438 A1 shows a transport vessel with a wingsail. The wingsail is provided with a mast which is pivotally connected to a frame and can be pivoted from an upright position to a stored position.

[0005] WO 2018 / 039705 A1 shows a boat with a crescent-shaped sail.

[0006] WO 2013 / 070070 A1 shows a boat with a mast structure and a rigid wing sail, wherein the main part of the wing sail is connected to the mast structure via a main tilting device.

[0007] Further boats equipped with sails are known, for example, from US 2014 / 144362 A1, FR 91964 E or US 2015 033998 A1. Summary of the Invention

[0008] An object of the present invention is to provide a sail that can be well aligned according to wind direction and effectively utilize wind energy.

[0009] According to the invention, this object is achieved in that in a sailboat of the type mentioned at the outset, the cross-sectional area of ​​the sail increases with increasing distance from the mounting element along a second portion of the sail, which is arranged between the mounting element and the first portion.

[0010] According to the present invention, since the sail tapers in the second portion in the direction of the mounting element, it also has an aerodynamically optimized profile, thereby reducing torque and making it easy to align the sail even in strong winds. At the same time, since the windward surface is relatively large in the area of ​​the sail where the end area of ​​the first and second portions facing each other is located, wind energy can be effectively utilized.

[0011] The reduction in the cross-sectional area of ​​the sail along the first portion and / or the increase in the cross-sectional area of ​​the sail along the second portion are preferably continuous. This makes the airflow more uniform and also simplifies the manufacture of the sail.

[0012] The first section is preferably longer than the second section. This provides a good balance between ease of handling and optimal utilization of wind energy. Preferably, the ratio of the length of the first section to the length of the second section is at least 2:1, more preferably at least 4:1, and particularly preferably within the range of 2:1 to 10:1. Experience has shown that this ratio decreases with increasing sail size. For example, for smaller sails, the first section is relatively large, which can result in a ratio of up to 10:1; preferably, this ratio is within the range of 5:1 to 10:1. For very large sails, this ratio can be reduced to 2:1; for larger sails, the ratio is preferably within the range of 2:1 to 6:1.

[0013] Depending on the size of the vessel, the length of the sail is at least 10 meters, more preferably at least 20 meters, particularly preferably at least 40 meters, and even more preferably at least 60 meters. The length-to-width ratio of the sail is preferably at least 10:1, more preferably at least 20:1, particularly preferably at least 40:1, even more preferably at least 60:1, and particularly preferably within the range of 20:1 to 60:1. The narrower the sail, the easier it is to adjust, even in strong winds. The taller the sail, the better it utilizes wind energy. The larger the sailboat, the greater this ratio should preferably be.

[0014] The sails can be attached to the deck of the sailboat. Preferably, they are attached close to the sides of the sailboat. This means that the sails are positioned at the edge of the sailboat. This means that the central area of ​​the sailboat's deck is free for other purposes, such as storing cargo to be transported, particularly containers.

[0015] Preferably, the distance between the sail and the side remote from the sail is at least 10 times, more preferably at least 20 times, particularly preferably at least 30 times, the distance between the sail and the side located immediately adjacent to the sail.

[0016] According to the invention, one end of the sail is connected to a mounting element. The mounting element preferably has a joint, particularly preferably a swivel joint or a ball-and-socket joint. This enables the sail to be easily rotated about a first axis of rotation.

[0017] Preferably, the mounting element is configured to pivot the sail about a second rotational axis. This second rotational axis is substantially parallel to the transverse axis of the sailboat. The sail can then be pivoted so that its longitudinal axis is substantially parallel to the longitudinal axis of the sailboat, which is referred to as the sail's standby position. This standby position reduces the risk of damage to the sail or the sailboat, for example during a storm. Furthermore, particularly when the sail is secured in close proximity to the side of the sailboat, the mid-section of the sailboat, particularly the mid-section of the sailboat's deck, remains free even when the sail is in the standby position.

[0018] The mounting element may comprise a hinge joint, a rolling joint or a swivel joint designed to pivot the sail about the second axis of rotation. The mounting element may also comprise a ball and socket joint configured to rotate the sail about the first axis of rotation and pivot about the second axis of rotation.

[0019] The windward side of the sail (over the length of the sail) preferably has a twist of at least 0.1°, more preferably at least 2°, and particularly preferably at least 5°. This twist allows a significant portion of the wind's energy to be converted into propulsion energy, allowing the sailboat to be driven with particularly high efficiency. The twist of the windward side (over the length of the sail) is preferably between 0.1° and 5°, more preferably between 1° and 5°, and particularly preferably between 1° and 3°.

[0020] The sail preferably has a hollow profile.The lightweight structure increases the stability of the sail while still making it easy to handle.

[0021] The hollow profile is preferably closed, especially at the end of the sail remote from the mounting element. This provides better protection for the interior of the hollow profile.

[0022] The hollow profile preferably comprises fiber-reinforced plastic, preferably glass-fiber-reinforced and / or carbon-fiber-reinforced plastic. This allows the hollow profile to maintain high rigidity while remaining lightweight. The plastic preferably contains epoxy resin. As a result, the sail not only exhibits good mechanical properties but also exhibits excellent resistance to environmental influences, such as UV rays.

[0023] The hollow profile may comprise a first covering layer, a core layer, and a second covering layer. Thus, the sail can be designed to be particularly stable. The core layer may comprise a foam material, wherein the foam material may comprise plastic, in particular polyurethane. The first and / or second covering layer may comprise fiber-reinforced plastic.

[0024] The hollow profile can include a first shell and a second shell connected to each other on two longitudinal sides. This makes the hollow profile easy to manufacture, particularly when made of fiber-reinforced plastic. The first and second shells can be bonded together on their longitudinal sides, preferably using an adhesive containing epoxy resin. The concave surface of the first shell can oppose the concave surface of the second shell.

[0025] The sail may have a strut arranged in the hollow profile. The strut may be substantially perpendicular to the inside of the hollow profile and serve to absorb thrust. Preferably, the strut has a U-shaped or I-shaped profile. This allows for better connection of the strut to the hollow profile, thereby increasing the sail's stiffness, particularly its bending stiffness. The strut may be bonded to the hollow profile, preferably using an adhesive containing epoxy resin.

[0026] The strut is preferably arranged at least in the region where the end regions of the first and second parts face each other. Since the cross-sectional area of ​​the sail is relatively large in this region, the strut can significantly increase the stiffness of the sail. The strut preferably extends over at least 30%, more preferably at least 50%, of the sail's height.

[0027] The brace preferably comprises fiber reinforced plastic, in particular glass fiber reinforced plastic. Like this, the brace just can possess the characteristics of high rigidity and light weight simultaneously.

[0028] The sailboat may include a control unit for controlling the sail. This enables the sail to rotate about a first rotation axis and, if necessary, pivot about a second rotation axis. The control unit may include a ball joint configured to rotate the sail about the first rotation axis and, if necessary, pivot about the second rotation axis. The motor may be disposed in or connected to the mounting element.

[0029] A sailboat preferably has at least two sails, more preferably two to twenty sails, particularly preferably two to twelve sails, and especially six to eight sails. This increases the propulsion energy generated, enabling the sailboat to propel quickly. The number of sails may vary depending on the size of the sailboat. For larger sailboats, eight or more sails are preferred.

[0030] Preferably, the two sails are arranged opposite each other in close proximity to the side of the sailboat. It is particularly preferred that the two sails arranged one behind the other in close proximity to the same side of the sailboat have different distances from the side of the sailboat. This offset arrangement allows all sails to be pivoted to the standby position without interfering with each other. Sails arranged on the same side are preferably rotated alternately 90° and -90° about the second rotation axis. This allows for a particularly space-saving arrangement of the sails in the standby position.

[0031] Alternatively, all sails arranged in front of and behind each other in close proximity to the same side of the sailing vessel can have the same distance to the side of the sailing vessel. The mounting elements of the successively arranged sails can have different heights. The sails can then be arranged on top of each other in the standby position. This also makes the arrangement of the standby position more space-saving. The height of a mounting element refers to the extension of the mounting element in the direction parallel to the vertical axis of the sailing vessel.

[0032] The sailing vessel preferably has a track for receiving the mounting elements. The track can be parallel to the longitudinal axis of the vessel. The sails can then be moved along the track and fixed in any position. If several sails are provided on the same side of the sailing vessel, all relevant mounting elements are preferably mounted on the same track. In this way, the distance between the sails can be adjusted, for example, in order to push the sails located leeward (Lee) out of the slipstream of the sails located windward (Luv).

[0033] The sails are preferably rotor blades. In the present application, rotor blades are understood to mean rotor blades of a wind turbine for converting wind energy into electrical energy. According to the application, discarded rotor blades can also be used as sails, which significantly promotes sustainability, since discarded rotor blades are usually only thermally recycled or buried.

[0034] When the sails are rotor blades, the mounting elements preferably have a hub. The sails can then be connected to the mounting elements in a similar manner to the connection of wind turbine rotor blades to the rotor. The sails can be mounted in the hub in such a way that they can rotate about a first axis of rotation. In addition, the hub can be configured in such a way that the sails can be pivoted about a second axis of rotation.

[0035] The sailing vessel can comprise an engine, for example a diesel engine or an electric motor, as additional propulsion, for example for maneuvering in a harbor area. In a preferred embodiment, the sailing vessel is a cargo ship, in particular a container ship, which is designed as a (conventional) motor ship (for example with diesel propulsion) and is equipped with sails according to the application. In this way, existing cargo ships can be made more environmentally friendly.

[0036] The application also relates to a sail for a sailing vessel, in particular for a cargo sailing vessel, wherein the sail is mountable to the outside of the sailing vessel by means of a mounting element, and wherein the cross-sectional area of the sail along a first portion of the sail decreases with increasing distance from the mounting element, characterized in that the cross-sectional area of the sail along a second portion of the sail increases with increasing distance from the mounting element, the second portion being arranged between the mounting element and the first portion.

[0037] This sail can have one or more features of the sails connected to the sailing vessel.

[0038] The sail is adapted to be attached to a mounting element on the outside of the sailing vessel, in particular on the deck of the sailing vessel. To this end, the sail can comprise anchoring elements for anchoring to the mounting element.

[0039] The invention also relates to a method for adjusting a sail, comprising the following steps: (a) providing a sailing vessel according to the invention, and (b) rotating the sail around a first axis of rotation.

[0040] In step (b), the sail can be adjusted to the wind direction by rotating the sail around the first axis of rotation.

[0041] If the mounting element is configured to pivot the sail around a second axis of rotation, the sail can also be in a standby position in step (a). The method then comprises, between steps (a) and (b), a further step (al) of pivoting the sail around the second axis of rotation before step (b). The sail can be moved from the standby position to the working position. In strong winds, the sail can also be positioned between the standby position and the working position to prevent damage to the sail while still being able to efficiently propel the sailing vessel. In this position, the longitudinal axis of the sail preferably forms an angle in the range of 10° to 80°, more preferably 20° to 70°, with the longitudinal axis of the sailing vessel.

[0042] In this specification, the "vertical axis" of a sailing vessel refers to the axis that is substantially perpendicular to the water surface when the vessel is in operation.

[0043] The invention particularly comprises the following embodiments: 1. Sailing vessel, in particular cargo sailing vessel, comprising a sail and a mounting element, wherein the sail is connected to the outside of the sailing vessel, in particular to the deck of the sailing vessel, by means of the mounting element, preferably wherein the mounting element is arranged to rotate the sail around a first axis of rotation, in particular wherein in the working position of the sail the first axis of rotation is substantially parallel to the vertical axis of the sailing vessel, and wherein the cross-sectional area of the sail along a first portion of the sail decreases with increasing distance from the mounting element, characterized in that the cross-sectional area of the sail along a second portion of the sail, which is arranged between the mounting element and the first portion, increases with increasing distance from the mounting element.

[0044] 2. Sailing vessel according to embodiment 1, characterized in that the decrease of the cross-sectional area of the sail along the first portion and / or the increase of the cross-sectional area of the sail along the second portion is continuous.

[0045] 3. The sailboat according to embodiment 1 or 2 is characterized in that the first part is longer than the second part, and the ratio of the length of the first part to the length of the second part is preferably at least 2:1, more preferably at least 4:1, and particularly preferably in the range of 2:1 to 10:1.

[0046] 4. The sailboat according to any one of embodiments 1 to 3, characterized in that the length of the sail is at least 10 meters, preferably at least 20 meters, more preferably at least 40 meters, and particularly preferably at least 60 meters.

[0047] 5. The sailboat according to any one of embodiments 1 to 4 is characterized in that the ratio of the length to the width of the sail is at least 10:1, preferably at least 20:1, more preferably at least 40:1, even more preferably at least 60:1, and particularly preferably in the range of 20:1 to 60:1.

[0048] 6. The sailboat according to any one of embodiments 1 to 5, characterized in that the sail is installed close to the side of the sailboat.

[0049] 7. A sailboat according to any one of embodiments 1 to 6, characterized in that the mounting element has a joint for rotating the sail, preferably a rolling joint, a swivel joint or a ball and socket joint.

[0050] 8. The sailboat of any one of embodiments 1 to 7, wherein the mounting element is configured to pivot the sail about a second axis of rotation, preferably wherein the second axis of rotation is substantially parallel to a transverse axis of the sailboat.

[0051] 9. The sailboat of embodiment 8, wherein the mounting element comprises a hinge joint, a ball and socket joint, or a swivel joint configured to pivot the sail about a second axis of rotation.

[0052] 10. The sailboat according to any one of embodiments 1 to 9, wherein the windward side of the sail has a twist of at least 0.1°, more preferably at least 2°, even more preferably at least 5°.

[0053] 11. The sailboat according to embodiment 10 is characterized in that the windward surface has a twist in the range of 0.1 to 5°, more preferably 1 to 5°, and particularly preferably 1 to 3°.

[0054] 12. The sailboat according to any one of embodiments 1 to 11, wherein the sail has a hollow profile.

[0055] 13. The sailboat according to embodiment 12, wherein the hollow profile is closed.

[0056] 14. The sailboat according to embodiment 12 or 13, wherein the hollow profile comprises fiber reinforced plastic.

[0057] 15. The sailboat according to embodiment 14, characterized in that the fiber reinforced plastic comprises glass fiber reinforced plastic and / or carbon fiber reinforced plastic.

[0058] 16. The sailboat according to embodiment 14 or 15, wherein the plastic comprises epoxy resin.

[0059] 17. The sailboat according to any one of embodiments 12 to 16, characterized in that the hollow profile comprises a first covering layer, a core layer and a second covering layer.

[0060] 18. The sailboat according to embodiment 17, wherein the core layer comprises a foam material, preferably a plastic, in particular polyurethane.

[0061] 19. The sailboat according to embodiment 17 or 18, wherein the first cover layer and / or the second cover layer comprises fiber reinforced plastic.

[0062] 20. Sailing boat according to any one of embodiments 12 to 19, characterized in that the hollow profile has a first shell and a second shell, which are connected to each other on two longitudinal sides.

[0063] 21. The sailboat of embodiment 20, wherein the first hull and the second hull are bonded to each other on both longitudinal sides.

[0064] 22. The sailboat according to embodiment 20 or 21, characterized in that the concave surface of the first hull faces the concave surface of the second hull.

[0065] 23. A sailboat according to any one of embodiments 12 to 22, wherein the sail has a stay arranged in a hollow profile.

[0066] 24. The sailboat of embodiment 23, wherein the strut has a U-shaped or I-shaped profile.

[0067] 25. Sailing boat according to embodiment 23 or 24, characterized in that the strut extends over at least 30%, in particular at least 50%, of the height of the sail.

[0068] 26. The sailboat according to any one of embodiments 23 to 25, wherein the strut comprises fiber reinforced plastic, in particular glass fiber reinforced plastic.

[0069] 27. The sailboat according to any one of embodiments 1 to 26, characterized in that the sailboat has a control unit for controlling the sails.

[0070] 28. The sailboat of embodiment 27, wherein the control unit comprises a motor configured to rotate the sail about the first rotation axis.

[0071] 29. The sailboat according to any one of embodiments 1 to 28, characterized in that the sailboat has at least two sails, preferably two to twenty sails, more preferably two to twelve sails, and particularly preferably six to eight sails.

[0072] 30. The sailboat of embodiment 29, wherein the two sails are arranged opposite each other close to the side of the sailboat.

[0073] 31. A sailboat according to embodiment 29 or 30, characterized in that the sails arranged in front and behind on the same side are at different distances from the side of the sailboat, and / or the mounting elements of the sails arranged in front and behind on the same side are at different heights.

[0074] 32. The sailboat of any one of embodiments 1 to 31, characterized in that the sailboat has a rail for receiving a mounting element.

[0075] 33. The sailboat of any one of embodiments 1 to 32, wherein the sail is a rotor blade.

[0076] 34. Sails for sailing vessels, especially cargo sailing vessels, Preferably, the sail can be mounted to the outside of the sailboat, in particular to the deck of the sailboat, by means of a mounting element, and wherein the cross-sectional area of ​​the sail along the first portion of the sail decreases with increasing distance from the mounting element, Characterized in that the cross-sectional area of ​​the sail increases along a second portion of the sail as the distance from the mounting element increases, the second portion being arranged between the mounting element and the first portion.

[0077] 35. The sail of embodiment 34, wherein the sail has one or more features of the sails of embodiments 1 to 33.

[0078] 36. A method of adjusting a sail, comprising the steps of: (a) providing a sailboat according to any one of embodiments 1 to 33, and (b) rotating the sail about the first rotation axis.

[0079] 37. The method of embodiment 36, wherein when the mounting element is configured to pivot the sail about the second rotation axis, the method further comprises, between steps (a) and (b), a step (a1) of pivoting the sail about the second rotation axis. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] The present invention will be described in more detail below with reference to the accompanying drawings, but the present invention is not limited to these drawings.

[0081] Figure 1 A schematic front view of a sailboat with eight sails is shown in a working position.

[0082] Figure 2 Shown Figure 1 Cross-section of a mid-sailing ship.

[0083] Figure 3 Shown Figure 1 Plan view of a mid-sailing ship, with the sails in the standby position.

[0084] Figure 4 Shown Figure 1 Front view of a mid-sailing ship with the sails rotated from the standby position to the working position (and vice versa).

[0085] Figure 5 Shown Figure 1 Detail of a midshipman. DETAILED DESCRIPTION

[0086] Figure 1 The outline of a sailboat 1 is shown. A mounting element 2 for fixing a sail 3 is provided on the deck of the sailboat 1. The sail 3 is a rotor blade and is in a working position. As shown in the figure, each sail 3 has a first part 4 and a second part 5, along which the cross-sectional area of ​​the sail 3 continuously decreases as the distance from the mounting element 2 increases, and along the second part 5, the cross-sectional area of ​​the sail 3 continuously increases as the distance from the mounting element 2 increases. The length of the first part 4 is greater than the length of the second part 5, wherein the ratio of the length of the first part to the length of the second part is approximately 2.5:1. In addition, each sail 3 can rotate about a first rotation axis 6, which is substantially parallel to the vertical axis 7 of the sailboat 1; and each sail 3 can also pivot about a second rotation axis 8, which is substantially parallel to the transverse axis 9 of the sailboat 1 (such as Figure 2 and Figure 3 ). The length-to-width ratio of each sail 3 is approximately 6:1. The windward side 10 of the sail 3 has a twist of 0.1°.

[0087] Figure 2 The cross-section diagram shows Figure 1Sailing vessel 1 in FIG. It can be seen that in each case two sails 3 are provided in the immediate vicinity of the side 11 of the sailing vessel 1. Therefore, in particular when the sailing vessel is designed as a cargo sailing vessel, the central area 12 of the deck of the sailing vessel 1 (e.g. Figure 3 shown) has space for cargo, such as containers.

[0088] Figure 3 Shown in floor plan Figure 1 A sailboat 1 is shown with its sails 3 in the standby position. As shown, two sails 3 are arranged on opposite sides 11 of the sailboat 1. Immediately adjacent to the same side 11, the two sails 3 arranged one behind the other are positioned at different distances from the corresponding side 11. This allows all sails 3 to be in the standby position without obstructing each other, allowing them to be stored adjacent to each other in a space-saving manner. The sails 3 arranged on the same side 11 are pivoted alternately 90° and -90° about the second rotation axis 8, allowing them to be compactly arranged in the standby position. This allows the central area 12 of the deck of the sailboat 1 to be used for other purposes without restriction, such as storing cargo to be transported.

[0089] Figure 4 and Figure 1 Similarly, the outline of the sailboat 1 is also shown. However, in Figure 4 In the process, the sail 3 is pivoted from the standby position to the working position and vice versa.

[0090] Figure 5 A detail of a sailboat 1 is shown. Mounting element 2 has a hub 13 to which a sail 3 (i.e., a rotor blade) is attached. Sail 3 is rotatably mounted in hub 13 and can rotate about a first axis of rotation 6. Hub 13 is also configured to allow sail 3 to pivot about a second axis of rotation 8.

Claims

1. A sailing vessel (1), in particular a cargo sailing vessel, having a sail (3) and a mounting element (2), in, The sail (3) is connected to the outside of the sailboat (1) via a mounting element (2), wherein the mounting element (2) is configured to rotate the sail (3) about a first rotation axis (6), wherein in the operating position of the sail (3), the first rotation axis (6) is substantially parallel to a vertical axis (7) of the sailboat (1), and wherein the cross-sectional area of ​​the sail (3) decreases along the first portion (4) of the sail (3) as the distance from the mounting element (2) increases, Characterized in that, as the distance from the mounting element (2) increases, the cross-sectional area of ​​the sail (3) increases along a second portion (5) of the sail (3), the second portion (5) being arranged between the mounting element (2) and the first portion (4).

2. The sailboat (1) according to claim 1, characterized in that The cross-sectional area of ​​the sail (3) is continuously reduced along the first portion (4) and increased along the second portion (5).

3. The sailboat (1) according to claim 1 or 2, characterized in that The first portion (4) is longer than the second portion (5).

4. The sailboat (1) according to any one of claims 1 to 3, characterized in that The length-to-width ratio of the sail (3) is at least 20:

1.

5. The sailboat (1) according to any one of claims 1 to 4, characterized in that The sail (3) is installed close to the side (11) of the sailboat (1).

6. The sailboat (1) according to any one of claims 1 to 5, characterized in that The mounting element (2) is configured to pivot the sail (3) about a second rotation axis (8), wherein the second rotation axis (8) is substantially parallel to a transverse axis (9) of the sailboat (1).

7. The sailboat (1) according to any one of claims 1 to 6, characterized in that The windward surface (10) of the sail (3) has a twist of at least 0.1°.

8. The sailboat (1) according to any one of claims 1 to 7, characterized in that The sail (3) comprises a hollow profile.

9. The sailboat (1) according to claim 8, characterized in that The hollow profile comprises fiber reinforced plastic.

10. The sailboat (1) according to claim 8 or 9, characterized in that The sail (3) comprises a strut arranged in the hollow profile.

11. Sailing boat (1) according to any one of the preceding claims, characterized in that The sailboat (1) comprises at least two sails (3), in particular six to eight sails.

12. The sailboat (1) according to claim 12, characterized in that The distances between the sails (3) arranged front and rear on the same side (11) and the side (11) of the sailboat (1) are different.

13. A sail (3) for a sailing vessel (1), in particular a cargo sailing vessel, in, The sail (3) can be mounted to the outside of the sailboat (3) via the mounting element (2). wherein the cross-sectional area of ​​the sail (3) decreases along the first portion (4) of the sail (3) as the distance from the mounting element (2) increases, Characterized in that, as the distance from the mounting element (2) increases, the cross-sectional area of ​​the sail (3) increases along a second portion (5) of the sail (3), the second portion (5) being arranged between the mounting element (2) and the first portion (4).

14. A method for adjusting a sail (3), comprising the following steps: (a) providing a sailboat (1) according to any one of claims 1 to 12, and (b) rotating the sail (3) about a first rotation axis (6).

15. The method according to claim 14, characterized in that When the mounting element (2) is adapted to pivot the sail (3) about a second rotation axis (8), the method further comprises, between steps (a) and (b), a step (a1): pivoting the sail (3) about the second rotation axis (8).

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