A fin intended for a navigation object, in particular an inflatable or rigid-shell water board, including a wing which is able to move with respect to a fastening base about an axis of rotation between a first stabilizing position and a second folded position, and a rotation blocking element for blocking the wing in the folded position, the axis of rotation being borne by two hinge components, one of which is fastened to the wing and the other to the fastening base, the hinge component fastened to the wing also being able to move translationally with respect to the hinge component fastened to the fastening base in order to unblock the wing.

The present disclosure provides generally for a hydrofoil system that may allow a surfboard to glide above the water surface. According to the present disclosure, a rider may be able to manipulate a hydrofoil device attached to a surfboard with limited training and athletic ability. The present disclosure provides for a hydrofoil system that may allow riders to use a light leaning motion to adjust the angle of a front wing to create forward thrust to produce a flow for creating lift. In some aspects, the front wing may tilt to reduce downward drag force in a lifting phase while locking into place during a glide to provide a sustained lift of the paddleboard out of the water.

A propellable aquatic board includes a main body that is at least partially buoyant. The propellable aquatic board also includes a flexible member secured to the main body by a fastener. The flexible member extends away from the main body in a longitudinal direction. The flexible member is configured to selectively deflect to propel the aquatic board through water.

A board paddling training apparatus for assisting in improving a user's paddling technique and strength. In particular, the board paddling training apparatus includes a buoyant board, such as a board adapted for surfing, bodyboarding, paddleboarding, or other board-related sport that entails paddling, and includes a resistance mechanism that creates drag or resistance against a user's paddle stroke. Some implementations of the resistance mechanism can be adjustable in order to create a variety of resistance against the user's paddle stroke and board movement.

Disclosed is an apparatus, optionally mounted on a stand up paddle board, or surfboard, to lift the board above the water surface and support the board in a stable position above the water surface while a rider standing on the board and maintaining a speed in the water via paddling. In one embodiment, the apparatus includes a strut; a fuselage connected to said strut; a back foil portion connected to an aft end of said fuselage wherein the back foil portion includes two back wings extending outwardly from said aft end of said fuselage; and a forward foil portion connected to a fore end of said fuselage wherein the forward foil portion includes two front wings extending outwardly from said fore end of said fuselage and wherein the forward foil portion has a maximum thickness located at first distance from the fore edge of the forward foil portion.

A personal watercraft includes a floatation member, a thrust assembly, a steering assembly, and a braking assembly. The assemblies may be actuated either mechanically or electrically. The thrust assembly is human powered, solar powered, or electric powered. The thrust, steering, and braking assemblies can be added after-market to an existing stand-up paddle board (SUP), or built into one or a plurality of SUPs during initial manufacturing. When the thrust assembly is human powered, it is leg or arm powered. When the thrust assembly is leg powered, the legs can move backward and forward in a sliding motion, up and down in a stomping fashion, or move in a loop trajectory. When the thrust assembly is arm powered, the arms can move forward/backward together or separately. The thrust assembly includes one or a plurality of paddles or flippers that are positioned to the side or under the SUP.

A personal watercraft includes a floatation member, a thrust assembly, a steering assembly, and a braking assembly. The assemblies may be actuated either mechanically or electrically. The thrust assembly is human powered, solar powered, or electric powered. The thrust, steering, and braking assemblies can be added after-market to an existing stand-up paddle board (SUP), or built into one or a plurality of SUPs during initial manufacturing. When the thrust assembly is human powered, it is leg or arm powered. When the thrust assembly is leg powered, the legs can move backward and forward in a sliding motion, up and down in a stomping fashion, or move in a loop trajectory. When the thrust assembly is arm powered, the arms can move forward/backward together or separately. The thrust assembly includes one or a plurality of paddles or flippers that are positioned to the side or under the SUP.

A fin for a surfboard having a base and a tip and wherein the fin includes an integral tunnel which provides a tubular housing; an electric motor and associated propeller attached to the integral tunnel so as to be substantially enclosed therein; wherein the integral tunnel and propeller are both positioned so that there is a blade section above and below the integral tunnel which each have a height which is at least substantially 70% of the diameter of the integral tunnel, and wherein the motor and the propeller are positioned forward of a rear edge of the fin. Also provided is a power source to supply power to the electric motor and associated housing and mounting plate. The arrangement of the motor and propeller are located forward of a rear edge of the fin allows the original feel and maneuverability of a non-powered surfboard to be preserved.

A movable float configured for self-propulsion by a user; the float including a board and hydrofoils; the board is mounted on hydrofoils at their ends with struts connecting the hydrofoil to the board. The movable float contains also a rope with a handle, a rudder and fairings.

The present disclosure provides generally for a hydrofoil system that may allow a surfboard to glide above the water surface. According to the present disclosure, a rider may be able to manipulate a hydrofoil device attached to a surfboard with limited training and athletic ability. The present disclosure provides for a hydrofoil system that may allow riders to use a light leaning motion to adjust the angle of a front wing to create forward thrust to produce a flow for creating lift. In some aspects, the front wing may tilt to reduce downward drag force in a lifting phase while locking into place during a glide to provide a sustained lift of the paddleboard out of the water.