This present invention relates to an electric fin and a water sports instrument, wherein the electric fin comprises a housing extending along a first direction and having a water inlet cavity; and a propeller and a guide member sequentially arranged in the first direction, wherein the propeller is located in the water inlet cavity, at least part of the guide member is located in the water inlet cavity, the water flow in the water inlet cavity flows out of the guide member; the propeller is provided with a propeller shaft and a plurality of blades, the propeller shaft extends in the first direction, and the plurality of blades are arranged on the propeller shaft in the circumferential direction; the guide member is provided with a guide shaft and a plurality of flow deflectors, the guide shaft extends in the first direction and the plurality of flow deflectors are arranged on the guide shaft in the circumferential direction; the outer contour enclosed by the propeller shaft and the guide shaft shows a projection in a second direction, whose size in a third direction gradually decreases along a fourth direction. The electric fin of the present invention has sufficient power and good guiding performance.

A modular hydrofoil watercraft may include a plurality of modules which are releasably connectable to each other to when assembled form the modular hydrofoil watercraft. The modular hydrofoil watercraft when assembled may include a hull extending along a longitudinal center axis, a propulsion system that has a motor and a propelling member, a mast that extends downwardly from the hull and a hydrofoil connected to the mast.

A modular hydrofoil watercraft may include a plurality of modules which are releasably connectable to each other to when assembled form the modular hydrofoil watercraft. The modular hydrofoil watercraft when assembled may include a hull extending along a longitudinal center axis, a propulsion system that has a motor and a propelling member, a mast that extends downwardly from the hull and a hydrofoil connected to the mast.

The invention relates to a water sport device having a sitting or standing surface (2) for a person practicing water sports, a jet drive (8) and a pivotable nozzle (13), wherein a fin (23) is disposed at the nozzle (13) and is arranged in a fixed position relative to said nozzle.

Hydrofoil assemblies that can be attached to a board used for watersports are disclosed herein. A hydrofoil assembly may include, for example, a mast a coupleable to a fuselage at a lower portion of the mast and coupleable to a board at an upper portion of the mast, and front and rear wings coupleable to the fuselage. A hydrofoil mast may include, for example, first and second composite sections bonded together to form a hollow load-bearing mast structure. Leading and trailing elements made of a material that is softer than the composite mast structure may be adhered to the mast structure to complete a hydrodynamic profile of the mast.

A motorized hydrofoil apparatus may include a sailboard having a top surface and a bottom surface; a first hydrofoil assembly having a first hydrofoil and a first support unit; a second hydrofoil assembly having a second hydrofoil and a second support unit; and a propulsion system. The hydrofoil apparatus may also include one or more sensing units disposed on predetermined locations on the first support unit to operatively communicate to a plurality of actuating units on the first hydrofoil assembly and second hydrofoil assembly to automatically generate corrective responses to various destabilizing hydrodynamic effects to stabilize the hydrofoil apparatus.

A water ski system includes an elongate ski body member having an aft end portion with a mounting face. Interchangeable tail members having an engagement face are configured to be selectively mounted to the ski body such that the engagement face of the tail member abut the mounting face of the ski body member. Attachment hardware removably fixes the selected tail member to the ski body member. The interchangeable tail members may have a variety of shapes and lengths, allowing a skier to customize the water ski to accommodate differing water ski styles, water, conditions, and skill levels.

A water ski system includes an elongate ski body member having an aft end portion with a mounting face. Interchangeable tail members having an engagement face are configured to be selectively mounted to the ski body such that the engagement face of the tail member abut the mounting face of the ski body member. Attachment hardware removably fixes the selected tail member to the ski body member. The interchangeable tail members may have a variety of shapes and lengths, allowing a skier to customize the water ski to accommodate differing water ski styles, water, conditions, and skill levels.

The present technology is generally directed to a fin assembly for watersport equipment, a watersport system including thereof, and a method of using thereof. In various embodiments, the fin assembly includes a support base and a foldable fin. The support base may be configured to attach the fin assembly to a surface of the watersport equipment. The foldable fin may include a fin portion configured to move between a folded position and a use position. The support base may have a locking member configured to lock the fin portion in and release the fin portion from the use position.

The present technology is generally directed to a fin assembly for watersport equipment, a watersport system including thereof, and a method of using thereof. In various embodiments, the fin assembly includes a support base and a foldable fin. The support base may be configured to attach the fin assembly to a surface of the watersport equipment. The foldable fin may include a fin portion configured to move between a folded position and a use position. The support base may have a locking member configured to lock the fin portion in and release the fin portion from the use position.