DE102022111216B4 - Universal stabilization device for watercraft - Google Patents

Abstract

Device (1) for stabilizing a watercraft (2), with a stabilizing element (3) and fastening means (4a-d) connected thereto, comprising a first fastening means (4a) and a second fastening means (4b), wherein the first and second fastening means (4a, 4b) are designed to attach the device (1) to the watercraft (2) by respectively gripping opposite first and second edges (5a, 5b) of the watercraft (2) in such a way that the stabilizing element (3) is arranged under the watercraft (2), characterized in that the device comprises a first arm section (6a-d) and a second arm section (6b), wherein the first arm section (6a) comprises the first fastening means (4a) and a first strut (7a) and the second arm section (6b) comprises the second fastening means (4b) and a second strut (7b), wherein the first and the second strut (7a, 7b) can be connected to the stabilizing element (3) and wherein the struts (7a, 7b) are arranged at an angle to one another and are made of an elastic material so that a distance between them is variable and the struts (7a, 7b) are designed to exert a tensioning force on the fastening means (4a, 4b), which presses the fastening means (4a, 4b) against the opposite edges (5a, 5b) when the fastening means (4a, 4b) engage around the edges (5a, 5b).

Description

TECHNICAL FIELD OF THE INVENTION

The present invention relates to a device for stabilizing a watercraft with the further features according to the preamble of claim 1. Furthermore, the invention relates to a means of locomotion which comprises the watercraft and the device.

BACKGROUND OF THE INVENTION

A watercraft is a device for moving on water. To ensure safe and comfortable use of the watercraft in the water, the watercraft must be stabilized. Such stabilization involves keeping the watercraft steady, i.e. avoiding rotational movements as a result of wind, waves, swell, shifting of the user's weight, etc. In particular, the risk of capsizing can be eliminated or at least reduced. A keel, for example, is used to stabilize a watercraft.

To improve the propulsion of a watercraft, motor-driven drives can be used. These allow higher speeds to be achieved and relieve the user of the watercraft, so that they have to exert little or no physical effort - for example by paddling - to move the watercraft.

The driving experience of the user of a watercraft is increasingly being improved by the use of a foil (also known as a hydrofoil). Put simply, a foil comprises a rod-shaped mast that is attached to the bottom of the watercraft and to which a hydrofoil is attached. If the hydrofoil moves through the water at a certain speed, it generates buoyancy, which lifts the watercraft out of the water by a certain height. This fundamentally changes the contact between the watercraft and the water, which, among other things, reduces frictional forces and offers new maneuvering options with the watercraft.

Thus, different advantages can be achieved using the previously mentioned attachments for a watercraft - keels, motors and foils: A keel increases stability, a motor enables a more comfortable drive for higher speeds, and a foil makes it possible to lift the watercraft out of the water while driving.

Separate mounting devices are known for the attachments mentioned. However, these are particularly disadvantageous for a user who wants to use one or more attachments of the above-mentioned type for the watercraft at the same time or who wants to quickly and easily replace an attachment. In particular, a combination of two or more of the above-mentioned components may be desired. For example, a motor drive increases the speed, which in turn enables greater buoyancy using a foil. However, since the use of a motor-driven drive and/or a foil makes it more difficult to stabilize the watercraft, an additional keel is sometimes desirable. In such a case, the user must carry out two or more assembly tasks. The disadvantage is that such assembly work is sometimes complex and requires several assembly devices. This makes it particularly difficult for the user to quickly adapt the attachments to the desired purpose - for example, relaxed paddling on calm water or sporty surfing using a foil and possibly also a motor-driven drive.

A further disadvantage of the devices of the prior art is that a user of a watercraft may not be able to expand this watercraft with one or more of the above attachments because, for example, the watercraft has unsuitable geometric dimensions and/or does not allow the possibility of attaching one or more of the components by means of a mounting device.

From the disclosure document DE 34 27 069 A1 The result is a swimming board that is stabilized by means of stabilizers that are arranged on the sides slightly below the board. The stabilizers are attached using outriggers, tension screws and tension straps that surround the board. The contact on the side edges of the board is covered with a filler that adapts to the external cross-section of the board.

The DE 20 2013 001 902 U1 concerns a conversion kit for a surfboard or stand-up paddle board that is intended to enable such a board to be used as a windsurfing board with a mast foot and a daggerboard or a fin. The conversion kit contains a strap that goes around the body of the board and supports the mast foot. The daggerboard or fin can also be attached to this or another strap.

The WO 2018/ 147 386 A1 relates to an underwater propulsion device for a watercraft. The device is connected to the watercraft via a support strut. It has a bow-side ated first chamber which houses an engine and a rear-side second chamber which houses a propeller which is connected to the engine via a shaft. The first chamber is designed to be watertight and the second chamber has a water inlet opening which is formed in the circumferential direction of the shaft 24 on the bow side of the propeller and a rear-side jet flow opening.

It is an object of the present invention to provide a device which can be used for watercraft of different sizes (thickness and/or width), which stabilizes the watercraft in the water and can be attached to the watercraft by means of a simple and quick assembly.

DESCRIPTION OF THE INVENTION

According to one aspect of the invention, the object is achieved by a device for stabilizing a watercraft, in particular a stand-up paddle board or a surfboard. The device has a stabilizing element and fastening means which comprise a first fastening means and a second fastening means. The two fastening means are designed to attach the device to the watercraft by respectively gripping opposite first and second edges of the watercraft in such a way that the stabilizing element is arranged under the watercraft. The device further comprises a first arm section and a second arm section, wherein the first arm section comprises the first fastening means and a first strut and the second arm section comprises the second fastening means and a second strut, wherein the first and the second strut are connectable to the stabilizing element and wherein the struts are arranged at an angle to one another and made of an elastic material so that a distance between them is variable and the struts are designed to exert a tension force on the fastening means which presses the fastening means against the opposite edges when the fastening means grip the edges.

A watercraft is a vehicle that is suitable for moving on or in water or bodies of water. The watercraft can comprise one or more edges. An edge can be at least partially straight and/or curved and/or angular and/or round and/or arched. Furthermore, the watercraft can comprise at least two flat sides, for example a side facing the water and a side facing away from the water. If an element (i.e. a part of the device according to the invention) is arranged below the watercraft, this can mean that this element is closer to the side facing the water than to the side facing away from the water. If an element is arranged above the watercraft, this can mean that this element is closer to the side facing away from the water than to the side facing the water.

In particular, the watercraft can be a surfboard. For example, a surfboard (also referred to as a surf board) is a board made of a buoyant material for moving on water. A special embodiment of a surfboard can be a so-called stand-up paddle board. In the context of the invention, a stand-up paddle board is understood to be a surfboard on which a user can move forward in the water while standing or sitting with the aid of a propulsion means to generate propulsion. In particular, it can be a surfboard with a large-volume floating body that offers sufficiently high tipping stability to ensure that the user stands safely on the stand-up paddle board. In principle, however, a stand-up paddle board is not subject to any restrictions in terms of its dimensions or volume within the scope of the present invention.

In conventional stand-up paddling, the user sits upright on such a stand-up paddle board and moves the stand-up paddle board forward by paddling using a propulsion device designed as a paddle. The type of propulsion generation therefore requires a certain amount of skill on the part of the user in order to maintain balance and stabilize the watercraft while paddling and when changing sides on which they are paddling. In general, the watercraft needs to be stabilized in order to use it safely and comfortably in the water.

In order to enable the stabilization of the watercraft, the device according to the invention comprises a stabilization element. Since the stabilization element is arranged under the watercraft, it can stabilize the watercraft in such a way that it counteracts in particular inclinations of the watercraft. In order to best prevent the watercraft from being stabilized against inclination in any possible direction, in particular longitudinal direction, the stabilization element is preferably arranged centrally under the watercraft. Centrally can mean that the stabilization element is parallel to an axis, in particular the axis of symmetry, of the watercraft.

Furthermore, the device according to the invention enables simple and quick attachment to watercraft of the aforementioned type. This is achieved in particular by the device comprising fastening means which can grip around at least one edge of the watercraft. This enables the user of the watercraft to easily attach the device to the watercraft, in particular tools such as screwdrivers etc. can be dispensed with.

As explained, the device comprises a first arm section and a second arm section. The first arm section comprises the first fastening means and a first strut. The second arm section comprises the second fastening means and a second strut. The first strut and/or the second strut can be connected to the stabilizing element.

In one embodiment, the first strut and/or the second strut can be detachably connected to the stabilizing element. This means that the device can be disassembled, i.e. can be broken down into at least two, three or more individual parts (i.e. first and/or second strut and the stabilizing element). The respective individual parts can also be referred to as modules. Such a modular structure, i.e. such modularity of the device, enables the disassembled device to be easily stowed away. Furthermore, the device can be easily transported. The expansion of the device, which is formed by the device comprising a Y-shape or a V-shape, can in particular be reduced by disassembling the device as described here. The stowing and/or transport of the disassembled device is thus made easier in particular by the fact that the described expansion of the device and thus of a suitable transport container for the device is reduced by disassembling.

As described below in further detail, the detachable connection can be designed as follows: The first and/or second strut can comprise one or more through-openings so that it can be connected to the stabilizing element, which can comprise one or more through-openings, by means of one or more bolts and suitable axial securing (e.g. lock nut and/or dowel pin, etc.). A through-opening can be a hole. In addition or alternatively, one or more threaded screws and correspondingly one or more threads can be used.

In one embodiment, the first strut and/or the second strut is permanently connected to the stabilizing element by means of a connection. This results in a high stability of the connection of a respective strut to the stabilizing element. The connection can comprise interlocking formations (convex/concave) for fixing. Preferably, the connection can comprise a screw connection and/or press connection and/or adhesive connection and/or solder connection and/or weld connection and/or positive screw locking and/or articulated connection etc. As described in detail below, two of the struts can form a V-shape when they are connected to the stabilizing element. The V-shaped section can be widened and/or narrowed, which causes a change in the distance between the first fastening means and the second fastening means. The advantage of designing the connection of the first strut and/or second strut to the stabilizing element as an articulated connection is that this enables the V-shape to be easily widened and/or narrowed and thus a change in the distance between the first fastening means and the second fastening means. This means that the device can be easily adapted to watercraft of different widths.

In an advantageous embodiment, the articulated connection comprises one or more spring elements. Such a spring element can provide a restoring force which (from a certain size of the opening angle of the V-shape) acts in the direction of narrowing the V-shape and thus reducing the distance between the first fastening means and the second fastening means. This ensures in particular that, after the device has been adapted to a predetermined width of a watercraft as described above, the restoring force fixes the device to the watercraft. In this case, the watercraft is clamped firmly, safely and stably between the fastening means of the device. The device is thus attached and/or fixed to the watercraft.

In one embodiment, a respective strut and/or the stabilizing element can be elongated. With the help of the arm sections, the stabilizing element can be connected to the watercraft in a safe, firm and stable manner.

In one embodiment, the struts can each be detachably connected to one of the fastening means. Advantageously, one or more Connecting pieces, e.g. bolts, in one or more matching receiving holes, preferably vertically and/or positively. This means that the device is secured against displacement relative to the fastening means in a plane parallel to the water surface. The bolts and the matching receiving holes can be designed in such a way that they interlock in such a way that, in addition or alternatively, displacement of the device perpendicular to the water surface or loosening of the device is prevented, preferably by means of a screw lock.

In addition or as an alternative, one or more snap fasteners can be provided to prevent such slipping or loosening. Preferably, each snap fastener can be made up of two or more parts - for example, comprising a bracket that is connected to the device or one of the parts of the fastening means, and a hook that is attached to the matching counterpart (fastening means or device). For example, by having each bracket grip a hook, it is ensured that the device cannot come loose from the fastening means. This securing can be reinforced, for example, by using a lever to generate a tension force that causes the hook to be pulled towards the bracket, which results in the device being pulled towards the fastening means, thus preventing the device from slipping or loosening from the watercraft.

Additionally or alternatively, the fastening means can be designed in such a way that they grip one or more edges of the watercraft firmly and are secured against slipping. This ensures that the device is secured against displacement and/or loosening relative to the watercraft after being connected to the fastening means.

Additionally or alternatively, the fastening means can be designed specifically for a watercraft and/or for a device. In this way, the fastening means can enable the combination of a large number of differently dimensioned watercraft with a large number of devices for stabilizing the respective watercraft in an adapter-like manner. Furthermore, this also means that a change in distance (of the type described here) between the struts for generating the clamping force can be kept to a minimum. This also enables the device to be used for different types of boats. Only due to the design of the fastening means can it be achieved that after the device has been connected to the fastening means by a force, e.g. clamping force, the device is firmly connected to the watercraft. Securing by means of connecting pieces for connecting the one or more fastening means can be provided additionally or alternatively.

Additionally or alternatively, the fastening means can be designed in such a way that they grip around differently shaped edges of the watercraft (for example a coaming of a boat) and the device can then be attached to the fastening means. This allows the stabilization device to be attached easily and quickly to a large number of watercraft.

As explained, the struts of the arm sections are arranged at an angle to each other and are made of an elastic material so that a distance between them is variable and the struts are designed to exert a tension force on the fastening means which presses the fastening means against the opposite edges when the fastening means grip the edges. In particular, the struts can be arranged together in the shape of a V which is bent apart when the fastening means grip the edges of the watercraft.

When the distance between the struts changes, the distance between the first and second fastening means also changes, so that this distance can be adapted to the width of the watercraft. This allows the device to be used in conjunction with watercraft of different widths. In addition, the tensioning force caused by the elasticity of the struts and acting on the fastening means connected to the struts results in the device being fixed to the watercraft.

In one embodiment, the length of the struts is also adjustable. This can be achieved by making the strut telescopic. This also makes it possible to adapt the device to different widths of the watercraft.

The tensioning force caused by the struts can, if necessary, fix the device to the watercraft with sufficient stability, so that additional fixing means can be dispensed with. However, it can also be provided that the device is attached to the watercraft using additional fixing means in order to increase stability. In addition, it can also be provided that the struts are pivotally connected to one another by a connection in such a way that they do not require any force to be applied to the fixing means. exert a clamping force acting on the device. This is the case, for example, if the connection is designed as an articulated connection. In these designs, additional fixing means are also preferably provided for the stable attachment of the device to the watercraft.

In a corresponding embodiment, the device comprises a connecting element for connecting the first and second fastening means, wherein the connecting element is designed to connect the first fastening means and the second fastening means on a side of the watercraft facing away from the water when the device is attached to the watercraft. The connecting element can provide additional protection against loosening and/or slipping of the fastening means and thus of the device. In particular, the fastening means can be pulled against the edges of the watercraft with a force by the connecting element. Preferably, the connecting element can engage in the fastening means like a hook and thus exert a tensile force by tension on the fastening means.

Preferably, the connecting element draws the first and second fastening means together or towards each other. The connecting element can draw the two fastening means together with such a force that the device can be firmly fixed to the watercraft. In particular, the device can be stationary in relation to the watercraft, i.e. the device does not move in relation to the watercraft, even if the watercraft with the device moves in or through the water. Since the connecting element runs on the side facing away from the water, water pressure against the connecting element is advantageously at least largely prevented. This also ensures that the user can easily attach it.

In one embodiment, the connecting element comprises a tensioning device for changing a length of the connecting element. In a connected embodiment, the connecting element is designed as a belt and the tensioning device comprises a lockable winding device for partially winding up the belt. This embodiment enables the device to be attached and fixed particularly easily to a watercraft with different dimensions, in particular with different widths.

In a further embodiment, the first and/or second fastening means are designed to completely surround the first and/or second edge. In one embodiment, the first and/or second fastening means are at least partially U-shaped. Furthermore, the first and/or second fastening means surround the first and/or second edge in one embodiment such that the U-shaped shape adapts to a thickness of the watercraft - i.e. an extension perpendicular to the water surface - when the device is attached to the watercraft. This can be achieved in particular by making the fastening means from an elastic material.

The aforementioned designs ensure that the fastening means grip the edge of the watercraft safely, stably and/or firmly. In addition, the fastening means can be precisely adapted to the dimensions of the edge of a watercraft. In particular, the device can also be adapted to the thickness of the watercraft in the area of the edge.

In one embodiment, the stabilizing element comprises one or more receiving devices for receiving one or more support elements for stabilizing the watercraft. The support elements can be detachably connected to the stabilizing element, but a fixed connection is also possible.

In one embodiment, the stabilizing element comprises a keel and the support element comprises a keel bulb. In conjunction with the keel, the device can protect the watercraft from tilting and/or capsizing. Various types of keels are possible, for example long keel, short keel, ballast keel, fin keel, bilge keel, double keel, triple keel, center keel, wing keel, swing keel, tilting keel, lifting keel, folding keel, beam keel, flat keel, rolling keel, etc. The keel bulb can preferably be designed in a streamlined manner. Furthermore, the keel bulb can be made from a high-density material.

In a further embodiment, the stabilizing element comprises a mast and the support element comprises a hydrofoil. Such a foil can comprise wings, so that from a certain speed of the foil in the water, the pressure below the foil is greater than above it and thus a lift is generated from the water. The aerodynamic and/or hydrodynamic properties thus make it possible to lift the watercraft out of the water at sufficient speed, which overall reduces the water resistance that slows the watercraft down. In one embodiment, since a watercraft with a foil may be subject to increased If stabilization is required, a keel as described above must be provided in addition to the foil.

Additionally or alternatively, the support element can comprise a drive unit. For example, the drive unit can contain a motor that drives a propeller so that it can generate propulsion for the watercraft. In one embodiment, the drive unit can be fully enclosed. This increases safety, in particular in that there is no risk of injury due to contact, for example, by the user, with rotating parts of the drive unit and/or with open propeller parts. In one embodiment, the drive unit can be operated by the user of the watercraft using a remote control. In a preferred embodiment, the drive unit is battery-operated.

The drive unit can be provided in addition to or as an alternative to the foil and/or keel described above. In particular, the combination of the described drive unit with one of the described foils is advantageous in that the drive unit generates the necessary speed for the watercraft to lift it out of the water using the foil. This allows the user to travel with a watercraft with a foil without physical exertion and/or waves and/or wind being necessary. Since such a combination may require increased stabilization of the watercraft, a keel can be provided in addition or in addition in a preferred embodiment.

As described above, the arm sections of the device each comprise a fastening means and a strut which can be connected to the stabilizing element. In one embodiment, it is provided that the stabilizing element can be connected to the struts at several possible fastening positions, and in each fastening position there is a different distance between the receiving device and the watercraft when the device is attached to the watercraft.

This makes it possible, for example, to adjust the distance between the watercraft and the mounting device for receiving the keel, drive unit and/or foil, and thus the draft of the watercraft, by selecting a fastening position. This allows the user to quickly and easily adapt the device for use in a specific water depth. For use in shallow water, the connecting section is selected such that the keel, drive and/or foil are closer to the watercraft and cannot be damaged by contact with the waterbed. For use in greater water depths, however, the user can adjust the device so that the keel, drive and/or foil are further away from the watercraft, which in turn increases the stabilization of the watercraft.

In one embodiment, the stabilizing element can be designed as a perforated plate, and the different fastening positions can each be formed by one or more holes. The struts can also have holes, and the connection between the stabilizing element can be made by guiding a plug pin and/or screw bolt and/or threaded screw and/or the like through the holes in the struts and the holes in the stabilizing element that are assigned to a specific fastening position.

Additionally or alternatively, the distance between the receiving device and the watercraft can be changed by the stabilizing element comprising a telescopic device and/or being designed to be telescopic. In particular, in one embodiment, the stabilizing element can comprise an outer tube and an inner tube inserted into the outer tube, which can be moved within the outer tube and can be locked continuously or at predetermined positions. Suitable mechanisms that can be provided for locking are known to those skilled in the art. These can, for example, comprise bolts that can be pushed through holes in the tubes that lie one above the other. Likewise, a mechanism can be provided, for example, in which clamping elements that lock the inner tube in the outer tube can be activated, for example by turning the inner tube.

According to a further aspect, the invention proposes a means of locomotion comprising a watercraft and a device according to the present invention that can be attached to the watercraft for stabilizing a watercraft.

• 1a - e jeweils eine beispielhafte und schematische Darstellung einer Ausführungsform einer Vorrichtung zur Stabilisierung eines Wasserfahrzeugs;
• 2a - c jeweils eine beispielhafte und schematische Darstellung einer Anbringung der Vorrichtung an Wasserfahrzeugen mit unterschiedlicher Dicke und/oder Breite;
• 3a - d jeweils eine beispielhafte und schematische Darstellung zur Veranschaulichung der Anordnung der Befestigungsmittel der Vorrichtung in einer ersten, zweiten und dritten Ausgestaltung;
• 4a - c jeweils eine beispielhafte und schematische Darstellung einer Verbindung der Befestigungsmittel durch ein Verbindungselement;
• 5a - d jeweils eine beispielhafte und schematische Darstellung des Stabilisierungselements umfassend mindestens eine Aufnahmevorrichtung zur Aufnahme eines oder mehrerer Unterstützungselemente;
• 6a - c jeweils eine beispielhafte und schematische Darstellung möglicher Ausführungsformen eines Foils zur Anwendung als Hydro-Foil;
• 7a - d jeweils eine beispielhafte und schematische Darstellung einer weiteren Ausführungsform einer Vorrichtung zur Stabilisierung eines Wasserfahrzeugs.

The above-mentioned and other special features of the invention will also become clear from the following description of embodiments of the invention with reference to the figures. The figures show:

• 1a - e each show an exemplary and schematic representation of an embodiment of a device for stabilising a watercraft;
• 2a - c an exemplary and schematic representation of an attachment of the device to watercraft with different thickness and/or width;
• 3a - d each show an exemplary and schematic representation to illustrate the arrangement of the fastening means of the device in a first, second and third embodiment;
• 4a - c each shows an exemplary and schematic representation of a connection of the fastening means by a connecting element;
• 5a - d each show an exemplary and schematic representation of the stabilizing element comprising at least one receiving device for receiving one or more support elements;
• 6a - c an exemplary and schematic representation of possible embodiments of a foil for use as a hydrofoil;
• 7a - d each show an exemplary and schematic representation of a further embodiment of a device for stabilizing a watercraft.

In the 1a - c is an exemplary and schematic view of a device 1 in a perspective view ( 1a) and in sectional views ( 1 b and 1c ) which can be attached to the vessel 2. In the 1d - e shows, by way of example and schematically, a detachable connection of the device 1 with the fastening means 4a and 4b.

The figures show a surfboard as the watercraft 2 by way of example. The surfboard can be a stand-up paddle board, in particular it can be a stand-up paddle board with one or more air chambers, which gets its shape by filling the air chamber(s) with air. The device 1 serves to stabilize the watercraft 2. The 1c shows schematically that the device 1 can be easily separated from the watercraft 2. As described below in further detail, the device 1 can be attached to the watercraft 2, for example from below, in order to attach a support element contained therein, in particular a keel with keel bulb and/or a hydrofoil to the watercraft, wherein the support element can be selected according to the intended purpose.

The watercraft 2 can have an elongated extension and comprise one or more edges 5a-d which delimit the watercraft 2. As an example, the 1a the edges 5a and 5b as longitudinal edges, which are essentially straight in the longitudinal direction. The edge 5c can be an edge with extension in the transverse direction. The edge 5d can also be extended in the transverse direction, but have a larger radius of curvature, i.e. be more strongly curved. A respective edge 5a-d can have a two-dimensional or three-dimensional surface, and can be determined by one, two or three radii of curvature. As shown by way of example in 1b visualized, the edges are extended in the vertical and horizontal direction, and comprise a curved curvature in the vertical direction. The watercraft 2, in particular a surfboard, can comprise an extension, in particular a width and/or a thickness. The width of the watercraft can be the extension of the watercraft, for example, along the section AA in 1a The thickness of the vessel can be the extension of the vessel, for example along section BB in 1b be considered.

The device 1 is characterized in particular by the fact that it is suitable for and can be attached to a large number of watercraft 2 with different geometries, edges, dimensions, properties, etc. This can be achieved by making the device 1 at least partially from elastic material. In order to attach the device 1 safely, securely and easily to the watercraft, the device can comprise fastening means 4a-d. The fastening means 4a-d can be designed in an arc shape so that the fastening means 4a-d can in particular grip around at least one of the edges 5a-d. In an advantageous embodiment, the fastening means 4a-d are at least partially made from elastic material (for example carbon, plastic, aluminum, sheet metal and/or steel, or the like) so that the fastening means 4a-d can grip around differently shaped edges 5a-d, preferably with a precise fit.

The fastening means 4a-d can each be provided at one end of a strut 7a-d, which is preferably also designed to be elastic. An arm section 6a-d can each comprise a respective fastening means 4a-d and a respective strut 7a-d. A strut 7a-d can have an elongated extension in order to thereby connect a corresponding fastening means 4a-d to a connection 8, which enables a connection between the one or more arm sections 6a-d to a stabilizing element 3, as described in more detail below.

A respective fastening means 4a-d can be attached to one of the edges 5a-d in such a way that it encompasses the respective edge. As an example, the 1a that the fastening means 4a the edge 5a and the fastening means 4b surrounds the edge 5b. In order to enable a stable grip, fastening means 4a-d can, for example, have a substantially U-shape, ie have a U-shaped form. In particular, 1 b the fastening means 4a-d each having a U-shaped form.

In order to ensure a stable attachment of the device to the watercraft 2, the fastening means 4a-d can be designed to be wider than an extension of the strut 7a-d.

Furthermore, the sections of the fastening means 4a-d located on the side of the watercraft 2 facing away from the water can be designed to be longer than the lower sections of the fastening means 4a-d connected to the struts 7a-d, which are located on the underside of the watercraft 2 when the fastening means 4a-d are mounted. This creates a large contact surface of the fastening means 4a-d with the upper side of the watercraft 2, which in particular results in a more stable attachment of the device, in particular slipping or a change in position of the device, for example due to water resistance, can be better prevented. Furthermore, the lower sections of the fastening means 4a-d (which extend transversely to the direction of movement of the watercraft 2) cause a low water resistance.

The inner surfaces of the fastening means 4a-d that come into contact with the watercraft 2 can be at least partially or completely provided with padding, which can be made, for example, of a rubber-like material or a foam material, in order to avoid damage to the watercraft 2, in particular the edges 5a-d.

The struts 7a-d can have fixed and/or variable lengths. The struts 7a-d can be connected to the stabilizing element 3 via a connection 8. 1a visualizes two arm sections 6a-b, each comprising a strut 7a-b and a fastening means 4a-b, and a stabilizing element 3.

Preferably, the stabilizing element is located substantially centrally under the watercraft 2, for example the distance (for example along the line A-A) between the stabilizing element 3 and each of the edges 5a and 5b can be almost identical. As a result, the stabilizing element 3 stabilizes the watercraft 2, in particular against rolling movements about a longitudinal axis. Undesirable lists can be prevented. In particular, this makes it safer for the user 31 to stay on the watercraft. For example, the stabilizing element 3 can act like a ballast keel as a counterweight in the event of heeling, namely by causing a righting moment. In particular, the stabilizing element 3 can accordingly have an elongated extension and be positioned substantially perpendicular to a side of the watercraft 2 facing the water.

Preferably, the stabilizing element 3 can have a support element 15 at its end remote from the watercraft 2. Possible embodiments of the support element 15 are described in detail below. In an advantageous embodiment, the support element 15 has a weight, for example a ballast keel. This further improves the weight stability of the watercraft 2. In a further embodiment, the stabilizing element 3 can comprise one or more support elements 15 of the type described herein. Furthermore, a respective support element can be encompassed by the stabilizing element 3 at a location other than that described above on the stabilizing element 3.

Each of the one or more support elements 15 can be firmly integrally and/or detachably connected to the stabilizing element 3. A firmly integral, for example one-piece, connection allows a stable connection of the support element 15 and the device 1. This can be advantageous in particular when traveling quickly on water in order to prevent the support element 15 from detaching from the device 1 or from slipping. A detachable connection allows the support element 15 to be attached, removed or replaced quickly and easily. This can be desired in particular if the user wants to quickly and easily adapt the use of the watercraft 2 with the device 1 to the desired use and/or the existing (water/wind/etc.) conditions.

Advantageously, one or more fixed, integral or detachable support elements 15 can be used in the stabilization element 3. For example, a user 31 can use a keel bulb, a foil and/or a motor-driven drive as possible support elements 15 individually or in combination. Further details on possible support elements 15 and their enclosure by the stabilization element are described below.

In the 1d - e is exemplary and schematically the device 1 as in 1b shown, where the device 1 and the fastening means 4a and 4b can be detachably connected to one another. For this purpose, the struts 7a and 7b can comprise connecting pieces 70a and 70b on their side facing the watercraft, which can be inserted into matching receiving holes 40a and 40b. 1d shows in a cross-sectional view a vertical and positive reception of the respective connecting piece 70a or 70b through the corresponding receiving bore 40a or 40b. This detachable connection of the device 1 and the fastening means 4a and 4b ensures that the device is secured against displacement relative to the fastening means in a plane parallel to the water surface. In order to additionally prevent displacement of the device perpendicular to the water surface or loosening of the device, according to 1d Clasps 50a and 50b are shown. Clasp 50a is shown in a half-closed condition. Clasp 50b is shown in a closed condition.

The snap fasteners 50a and 50b can each comprise a bracket 51a and 51b, a lever 53a and 53b and a hook 52a and 52b. As an example, 1d that a respective hook 52a and 52b is connected to the device 1, or the respective struts 7a and 7b of the device. By way of example, 1d further that a respective bracket 51a and 51b is connected to the respective fastening means 4a and 4b via the respective lever 53a and 53b. Joints 54, which can enable a relative rotational movement, can be provided in order to connect the bracket 51a and 51b to the lever 53a and 53b or the lever 53a and 53b to the fastening means 4a and 4b. Advantageously, the one or more joints 54 can comprise spring elements and/or locking elements which enable the snap fasteners 50a and 50b to be secured against unintentional opening after they have been closed. The brackets 51a and 51b and the levers 53a and 53b can be pivoted by means of the joints 54. To close one of the snap fasteners 50a and 50b, the respective lever 53a and 53b is pivoted so far that the respective bracket 51a and 51b can engage in the respective hook 52a and 52b. If the respective lever 53a and 53b is then moved in the closing direction, the respective hook 52a and 52b is pulled by the respective bracket 51a and 51b by means of a pulling force towards the respective fastening means 4a and 4b, which has the consequence that the device is pulled towards the fastening means 4a and 4b, thus preventing the device 1 from slipping or becoming detached from the watercraft 2. A respective lever 53a and 53b and/or a respective bracket 51a and 51b can be designed to be curved so that they can nestle against the fastening means 4a and 4b, which can be designed to be curved, for example, due to the geometry of a watercraft 2. As an example, 1e the snap fastener 50a. After the bracket 51a has engaged the (preferably elongated) hook 52a, the lever 53a can be pivoted in the closing direction to close the snap fastener 50a - for example, 1e a closure by turning the lever 53a clockwise, which is indicated by the curved arrow in 1e is visualized as an example.

In the 2a - b is an exemplary and schematic view of the device 1 as shown in 1b shown. The 2a - d show a design with two arm sections 6a, b comprising two struts 7a, b. In particular, however, the 2a - b schematically shows the same device 1 as it is attached to two watercraft 2 with different thicknesses. In particular, the fastening means 4a - b can be so elastic that they can grip the different edges 5a - b firmly and stably. As a result, the device 1 is suitable for attachment to watercraft 1 of different shapes and/or spatially extended. Furthermore, no complicated and time-consuming attachment of the device 1 to the watercraft 2 is necessary. In addition, attachment tools such as screws, screwdrivers, mounting plates, etc. can be dispensed with.

In the 2a and c is an exemplary and schematic view of the device 1 as shown in 1b shown, however, the 2a and c schematically the same device 1 as it is attached to two watercraft 2 with different widths. This is achieved by different distances between the fastening means 4a, 4b connected to the struts 7a, 7b, which in one embodiment can result from the elastic design of the struts 7a, 7b. This leads to the struts 7a, 7b being able to bend apart in such a way that the angle 9 between the struts 7a, 7b increases. The struts can also take on a curved shape (not shown in the figures), the bending radius being dependent on the extent to which the struts are bent apart.

This allows the device to be adapted to watercraft 2 with different widths. In addition, the elastic deformation of the struts 7a, 7b also causes a tension force which presses the fastening means 4a, 4b against the edges of the watercraft 2 and in this way fixes the device to the watercraft 2.

It can be provided that the user uses the struts 7a, 7b to mount the device device on the watercraft 2 is manually bent apart and the device is then positioned on the watercraft 2. If the device is a stand-up paddle board that gets its shape by being filled with air, the user can position the device on the board even when the board is not yet completely filled with air and therefore has a small width or can be made to be a small width. The user can then (continue to) fill the board with air until it has expanded to its full width against the tension force caused by the struts 7a, 7b. This enables the device to be installed particularly easily. At the same time, using suitable pumps, such as those generally used to fill stand-up paddle boards anyway, a high tension force can be generated and the device can thus be securely fastened.

If necessary, a sufficiently stable fastening of the device can be achieved in this way, so that the use of additional fixing means can be dispensed with. In order to increase the stability of the fastening, the use of such fixing means can, however, be provided. These can in particular comprise the connecting elements 11 described below.

In further embodiments, the struts 7a and 7b can also be pivotally connected to one another or to the stabilizing element 3. Suitable articulated connections can be provided for this purpose. In these embodiments, the angle 9 between the struts 7a, 7b can also be changed in order to adapt the device 1 to watercraft 2 with different widths. The articulated connections can in principle also have suitable elastic elements such as springs in order to bring about the previously explained tensioning force for fixing the device 1. However, if this is not the case, the device 1 can only be fixed by means of the previously mentioned fixing means, in particular by means of the connecting elements 11.

Alternatively or additionally, it is also possible to make the device 1 adaptable to watercraft 2 with different widths by changing the length of the first and/or second strut 7a, b. For example, the struts 7a-d can be designed to be telescopic. In particular, the struts 7a-d in this design can comprise an outer tube and an inner tube inserted into the outer tube, which can be moved within the outer tube and can be locked continuously or at predetermined positions. Suitable mechanisms that can be used for locking are known to those skilled in the art.

Preferably, the lengths of the first and/or second strut 7a, b are identical. This causes the stabilizing element 3 to be located substantially centrally under the watercraft 2 when the device 1 is attached to the watercraft 2, thereby achieving stabilization of the watercraft 2.

The data based on the 2a -c can be combined as desired. As a result, the device 1 is suitable for attachment to differently shaped and/or spatially extended watercraft 2, which can have different thicknesses and/or widths. In particular, when surfing, surfboards with a larger width are used for a more relaxed ride on the water or for beginners, and surfboards with a smaller width are used for a sportier ride or for more experienced wave riders. Due to the adaptability of the device 1 to different widths and/or thicknesses of the watercraft 2, the same device 1 can easily be used in all of the areas mentioned. If the user wishes to change the device from one watercraft 2 to another, it is easy for the user.

The 3a - d show an exemplary and schematic representation to illustrate the arrangement of the fastening means 4a,b of the device in various embodiments. In particular, the 3a - d exemplary and schematically the device 1 attached to the watercraft 2, as for example in 1a shown, looking from below vertically (relative to the vessel 2) upwards. In particular, the 3a - d the device 1 in different embodiments in that they comprise a different number of struts 7a-d and fastening means 4a - d.

In the exemplary 3a In the embodiment shown, the device has two struts 7a, b and two fastening means 4a, b, wherein between the struts 7a, b there is an angular distance of approximately 180° within the plane, as can be seen by means of 3a is visualized in a schematic plan view, i.e. the sheet/drawing level.

Further embodiments of the device 1 differ in the arrangement and/or number of struts 7a,b and fastening means 4a,b. Among other things, the desired purpose of use of the watercraft 2 with the device 1 can determine the optimal number of struts 7a-d and fastening means 4a-d. An optimal fastening, ie avoiding slipping/loosening of the device 1 on the watercraft 2 is achieved by an appropriate selection of the angular distances.

Thus, the device may comprise three struts 7a-c and three fastening means 4a-c, as shown in 3b , c. Preferably, there can be an angular distance of approximately 180° between the first and second struts 7a, b and an angular distance of approximately 90° between the first or second strut 7a, b and the third strut 7c, as shown in the 3b visualized in a schematic plan view. Alternatively, the struts 7a-c can also be arranged at other angular distances from each other. Such an arrangement is shown in the 3c illustrated schematically and by way of example. Here, there is approximately the same angular distance of 120° between all struts 7a-c.

Furthermore, the device 1 can comprise more than three struts 7a-d and fastening means 4a-d. In particular, approximately four struts 7a-d and four fastening means 4a-c can be provided, as shown schematically and by way of example in the 3c As shown in the 3c As shown, the struts 7a-d can be arranged such that the two rear struts 7c, d are arranged at approximately the same distance from the edge 5c (stern edge) of the watercraft 2 on both sides of the central longitudinal axis of the watercraft 2 and that the two front struts 7a, b are also arranged at approximately the same distance from the edge 5c of the watercraft 2 (which is greater than the distance of the rear struts 7c, d to the edge 5c) on both sides of the central longitudinal axis. The angular distances between the two front struts 7a, b and between the two rear struts 7c, d can be approximately the same. Optionally, the angular distance between adjacent front struts 7a, b and rear struts 7c, d can be smaller or larger than the previously mentioned angular distance between the front struts 7a, b and the rear struts 7c, d. However, it may alternatively be provided to mount the four struts 7a-c at equal angular intervals of 90°.

The - possibly additional - fixing of the two, three or four struts 7a-d to the watercraft 2 can be carried out in a similar manner as described below using one or more connecting elements 11, which each connect the opposing front struts 7a, b and the opposing rear struts 7c, d to one another and whose lengths can be changed by one or more tensioning devices 10 in order to tension the connecting elements 11. Preferably, the one or more connecting elements 11 run on the side of the watercraft 2 facing away from the water in the transverse direction, for example perpendicular to a direction of travel of the watercraft 2.

The 4a -c show an exemplary and schematic representation of a connection of the fastening means 4a, b by a connecting element 11. The connecting element 11 advantageously pulls the fastening means 4a, b connected to the connecting element 11 together with a force - i.e. towards each other - so that the respective fastening means 4a, b are pulled against the respective encompassed edge 5a-d of the watercraft 2. The device 1 is thus attached to the watercraft 2 in a stable manner overall. Through such a reinforced fixation, the device 1 is better protected against slipping, detaching, etc. from the watercraft, especially when the water resistance acts against the device 1 with a force when traveling on water.

The 4a - b show, by way of example and schematically, how the connecting element 11 connects the fastening means 4a, b on a side facing away from the water, i.e. runs above the watercraft 2. The view in 4a on the vessel 2 with device 1 corresponds to the view in 1b , i.e. in the direction of view towards the cutting surface determined by the section AA in 1a . 4b shows the watercraft 2 with the device 1 and a connecting element 11 from above, i.e. shows the watercraft 2 from its side facing away from the water (in contrast to 1a , which shows the watercraft 2 from its side facing the water).

In order to fix the device 1 in this embodiment to the watercraft 2, the two fastening means 4a, b, which are opposite one another in the assembled state of the device 1, can be coupled to one another by a connecting element 11, the length of which can be changed using a tensioning device 10. The connecting element 11 can be fastened to the fastening means 4a, b.

In one embodiment, the connecting element 11 is designed as a belt connecting the fastening means 4a, b, which can be made of a textile material, for example. When using such a belt, the connecting element 11 can be folded up in a simple manner if the device 1 is to be transported or stored, for example.

The connecting element 11 with tensioning device 10 can be a one-part or two-part tensioning belt or lashing belt with or without a ratchet. In one embodiment, the tensioning device 10 connects a first part of the connecting element 11, which is fastened to one of the fastening means 4a, b, and a second part of the connecting element 11, which is connected to the other fastening means 4a, b. The tensioning device 10 can comprise a winding device in order to partially wind up one or more of the parts. The winding device can be lockable so that the length of the connecting element 11 can be set and the connecting element 11 can in particular be tensioned in this way. By such tensioning, the watercraft 2 is clamped between the fastening means 4a, b of the device 1 and the device 1 is thus fixed to the watercraft 2. In order to be able to remove the device 1 from the watercraft 2, the lock can be released again. The winding device can be designed in a way known to the person skilled in the art. In particular, it can be a lever ratchet, as is often used with tensioning belts or lashing straps.

In order to attach the device 1 to the watercraft 2, the fastening means 4a-d are hooked onto the edges 5a-d of the watercraft 2 so that they are encompassed by the respective fastening means 4a-d. The fastening means 4a-d can be hooked onto the side edges 5a-d of the watercraft. Then, in one possible embodiment, the connecting element 11 can be hooked into a suitably shaped opening in the fastening means 4a-d by means of a hook-like device, as shown schematically in 4c is shown. A belt or similar can be attached to the hook-like device, which is then connected to the tensioning device 10 after a certain length. By means of the tensioning device 10, the connecting element 11 can now be tensioned in such a way that the watercraft 2 is firmly, safely and stably clamped between the fastening means 4a-d. The device 1 is thus fastened to the watercraft 2.

In the 5a -d, the stabilizing element 3 and the struts 7a, b are shown by way of example and schematically, wherein the stabilizing element 3 comprises at least one receiving device 12 which is suitable for receiving at least one support element 15.

In general, the device 1 can be designed such that the support element 15 can be detachably connected to the stabilization element 3. For example, a support element 15 can be connected to the stabilization element 3 in a way that is screwable, pluggable and/or insertable. In one possible embodiment, a magnetic connection, a plug-in system and/or a rail system can be provided for this purpose. For example, the stabilization element 3 and/or the support element 15 can comprise a grooved rail onto which a sliding plate of the stabilization element 3 and/or the support element 15 can be inserted. Preferably, the stabilization element 3 can be plugged or inserted onto the support element 15 against the direction of travel of the watercraft 2. This means that the support element 15 cannot become detached from the stabilization element 3 due to water resistance. In addition, the support element 15 can be additionally secured against slipping or loosening by latches and/or pins.

Alternatively, the support element 15 can be firmly connected integrally to the stabilizing element 3, for example by means of an adhesive connection, a soldered connection and/or a welded connection. Such a firm connection ensures that the support element 15 does not slip or detach from the stabilizing element 3.

5a shows a keel bomb 17 as a possible embodiment of a support element 15. 5b shows a hydrofoil 22 as a possible embodiment of a support element 15. 5c shows a drive 23 as a possible embodiment of a support element 15. The support elements 15 mentioned can be combined as desired, for example the device can accommodate three support elements 15, namely a keel bulb 17, a hydrofoil 22 and a drive 23, as is shown for example in 5d The hydrofoil 22, but generally also the keel bulb 17 and/or the drive 23 can each be detachably connected to the stabilizing element 3 or be firmly connected to it. In one embodiment, the support element 15 can have a slot-like shape, preferably for partially receiving the stabilizing element 3, as in 5d shown.

The keel 16 is advantageously mounted centrally under the watercraft 2 in order to stabilize the watercraft 2 against inclinations about the longitudinal axis. The keel bulb 17 can have different shapes - i.e. be streamlined, teardrop-shaped and/or elongated etc. - and/or have different geometric dimensions - length, width, thickness and/or curvature - and/or have different weights. The degree of stabilization of the watercraft 2 depends in particular on the vertical length of the keel 16 and/or on the weight of the keel bulb 17 - the deeper and heavier the keel bulb 17 reaches into the water, the greater the righting leverage against inclinations. Furthermore, the driving characteristics of the watercraft 2 equipped with the device 1 depend on the shape and/or geometric dimension of the keel bulb 17.

In order to optimally adapt the device 1 to the desired application, as described above, in an advantageous embodiment of the invention the keel bulb 17 can be detachably connected so that the user can select and adapt the keel bulb 17 (i.e. shape, geometric extension and/or weight) accordingly. In addition or alternatively, the draft of the device 1, i.e. the distance between the support element 15 and the watercraft 2, can be designed to be variable, as is the case for 7 This allows the device to be adapted for use in water of different depths, thus preventing contact of the device 1 with the bottom and damage to the device.

The 5c shows, by way of example, the receiving device 12 adapted to receive a drive unit 23. Preferably, the drive unit 23 can be motor-driven. This enables the user to achieve higher speeds without exerting any effort, which would not be achievable, for example, due to wind, waves and/or propulsion by paddle. In particular, lifting the watercraft 2 out of the water can be achieved more easily using a foil. The drive unit 23 can further comprise an electric motor and/or a battery and/or a propeller, preferably a propeller with a protective cover. In an advantageous embodiment, the drive unit 23 can be connected by wire and/or wirelessly to a remote control, via which the user can control the speed, for example. Additionally or alternatively, the drive unit 23 can be integrated within or at least partially within a nacelle, which is preferably watertight and/or streamlined. This protects the drive unit 23 from damage. In a further embodiment, the nacelle can be designed like a keel bulb 17 described above. Thus, the advantages of using a drive unit 23 with additional stabilization of the watercraft 2 are achieved.

The 5b shows, by way of example, the receiving device 12 adapted to receive a (hydro)foil 22. Accordingly, the stabilizing element 3 can comprise a mast 18 which is designed as a spacer. Depending on the area of application and/or the user's skills and/or wind/water conditions, masts of different lengths can be used. The foil 22 comprises wing-shaped elements which can act as hydrofoils, i.e. when the foil 2 moves sufficiently through water, they generate a lift which is transferred to the watercraft 2 via the device 1 and preferably lifts it out of the water when traveling in the water. In general, the size of the hydrofoil 22 determines the lift and stability. On the other hand, a smaller foil size allows for better maneuverability with the watercraft 2. The 6a -c possible embodiments of a (hydro)foil 22 in a vertical plan view.

In particular, 6a a narrow, steep or pointed form of a hydrofoil 22, which is suitable for fast journeys on water, where increased maneuverability of the watercraft is to be achieved. Furthermore, such a form enables higher speeds and/or greater maneuverability with the watercraft. In contrast, 6b a hydrofoil 22 with a more extensive shape, which can be suitable for less experienced users of a watercraft. In one possible embodiment, the hydrofoil 22 can comprise a front part 22a and a rear part 22b, which can advantageously be arranged in front of or behind the stabilizing element 3. In particular, this further increases stability. Preferably, the front part and/or the rear part can be supplemented by one or more additional vertical rear parts, which further improves stabilization.

The 7a - show by way of example and schematically the device 1, attached to the vessel 2 in the view as in 1b , wherein the stabilizing element 3 comprises at least two connecting areas 13 at different fastening positions. The struts 7a, b are connected to the stabilizing element 3 via a respective connecting area 13 by means of a bolt 14 and suitable axial securing (lock nut and/or dowel pin, etc.). In addition or alternatively, a threaded screw can be used. The 7a and 7b differ in that different connection areas 13 were chosen. As a result, the distance between the receiving device 12 for receiving the support element 15 (keel and/or foil and/or drive) is different. The embodiment in 7a has a greater draft (ie the support element 15 is deeper in the water) and is therefore more suitable for use in greater water depths. By placing the support element 15 deeper in this way, the stabilization of the watercraft 2 is increased without there being a risk that the support element 15 could be damaged by contact with the water bottom. If a user enters water with the device 1 into water with a shallower water depth, the user can quickly and easily attach the struts to a deeper connection area 13. This gives the watercraft 2 with the device attached a shallower draft. (ie the support element 15 is higher in the water). This prevents the support element 15 from being damaged by contact with the (higher) water bottom.

The 7c , d show exemplary and schematically the device 1 according to the 7a , b in an oblique view, such as in the 5a -d. The connecting regions 13 comprise a first, second, third, fourth and fifth connecting region 13a-d, in each of which a fastening hole is provided. A bolt 14 is guided through a hole in strut 7b, one of the connecting sections 13a-d and through a hole in strut 7a and fixed. 7c shows the guidance of the bolt 14 through the hole of the fifth connection area 13e, which results in the support element 15 being further away from the watercraft 2 and thus deeper in the water (cf. 7a) . 7d shows the guidance of the bolt 14 through the hole of the second connection area 13b, which results in the support element 15 being closer to the watercraft 2 and thus higher in the water (cf. 7a) .

LIST OF REFERENCE SYMBOLS (PART OF THE DESCRIPTION):

1

contraption

2

Watercraft

2a

Water-facing side of the vessel

2 B

Side of the watercraft facing away from the water

3

Stabilizing element

4a-d

Fasteners

5a-d

Edge

6a-d

Arm section

7a-d

strut

8th

Connection

9

angle

10

Clamping device

11

Connecting element

12

Recording devices

13

Connecting section

14

bolt

15

Support element

16

Kiel

17

Keel bomb

18

mast

19

Propulsion system

20

motor-driven drive element

21

wind-driven propulsion element, sail

22

Hydrofoil or Foil

23

Drive unit

24

U-shaped form

30

Water

31

user

40a - 40b

Mounting hole

50a - 50b

Snap fasteners

51a and 51b

hanger

52a and 52b

Hook

53a and 53b

lever

54

joint

70a - 70b

Connectors

Claims (15)

Device (1) for stabilizing a watercraft (2), with a stabilizing element (3) and fastening means (4a-d) connected thereto, comprising a first fastening means (4a) and a second fastening means (4b), wherein the first and second fastening means (4a, 4b) are designed to attach the device (1) to the watercraft (2) by respectively gripping opposite first and second edges (5a, 5b) of the watercraft (2) in such a way that the stabilizing element (3) is arranged under the watercraft (2), characterized in that the device comprises a first arm section (6a-d) and a second arm section (6b), wherein the first arm section (6a) comprises the first fastening means (4a) and a first strut (7a) and the second arm section (6b) comprises the second fastening means (4b) and a second strut (7b), wherein the first and the second strut (7a, 7b) can be connected to the stabilizing element (3). and wherein the struts (7a, 7b) are arranged at an angle to one another and are made of an elastic material so that a distance between them is variable and the struts (7a, 7b) are designed to exert a tensioning force on the fastening means (4a, 4b), which presses the fastening means (4a, 4b) against the opposite edges (5a, 5b) when the fastening means (4a, 4b) engage around the edges (5a, 5b). Device (1) according to Claim 1 , wherein the struts (7a, 7b) are each detachably connectable to one of the fastening means (4a-d), in particular by means of a snap fastener (50a, 50b). Device (1) according to Claim 1 or 2 , wherein the first and second struts (7a, 7b) are detachably connectable to the stabilizing element (3). Device (1) according to one of the preceding claims, comprising a connecting element (11) for connecting the first and second fastening means (4a-d), wherein the connecting element (11) is designed to connect the first fastening means (4a) and the second fastening means (4b) on a side of the watercraft (2) facing away from the water when the device (1) is attached to the watercraft (2). Device (1) according to Claim 4 , wherein the connecting element (11) comprises a tensioning device (10) for changing a length of the connecting element (11). Device (1) according to Claim 5 , wherein the connecting element (11) is designed as a belt and wherein the tensioning device (10) comprises a lockable winding device for partially winding up the belt. Device (1) according to one of the preceding claims, wherein the first and/or second fastening means (4a-d) is designed to completely encompass the first and/or second edge (5a-d). Device (1) according to one of the preceding claims, wherein the first and/or second fastening means (4a-d) at least partially has a U-shaped form (24), wherein the first and/or second fastening means (4a-d) engages around the first and/or second edge (5a-d) in particular such that the form (24) adapts to a thickness of the watercraft (2). Device (1) according to one of the preceding claims, wherein the stabilizing element (3) comprises one or more receiving devices (12) for receiving one or more support elements (15). Device (1) according to Claim 9 , wherein the stabilizing element (3) comprises a keel (16) and the support element (15) comprises a keel bulb (17), and/or wherein the stabilizing element (3) comprises a mast (18) and the support element (15) comprises a hydrofoil (22). Device (1) according to Claim 9 or 10 , wherein the support element (15) comprises a drive unit (23), preferably a motor-driven drive unit (23). Device (1) according to one of the Claims 9 until 11 , wherein the stabilizing element (3) is connectable to the struts at several possible fastening positions, and in each fastening position there is a different distance between the receiving device (12) and the watercraft (2) when the device (1) is attached to the watercraft (2). Device according to one of the Claims 9 until 12 , wherein the stabilizing element (3) comprises a telescopic device which is designed to change a distance between the receiving device (12) and the watercraft (2). Device (1) according to one of the preceding claims, wherein the watercraft (2) is a stand-up paddle board or a surfboard. Means of locomotion comprising a watercraft (2) and a device according to one of the preceding claims which can be attached to the watercraft (2) for stabilizing the watercraft (2).

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