Disclosed is a fuselage assembly (100) configured to be attached to a mast assembly (50) of a powered hydrofoil watercraft (1). The fuselage assembly (100) comprises a mast assembly fixation section (106) and an outer housing portion (170) which accommodates, in particular surrounds or encases, a propulsion device (200), in particular an impeller (201), and which outer housing portion (170) at least partially limits an outer dimension of a flow channel (161) through which water is transported during operation of the hydrofoil watercraft (1). The outer housing portion (170) comprises an attachment portion (310) on which a tail unit (300), in particular 10 comprising a stabilizing member (301) such as a stabilizing wing (302), is formed or attachable thereto. In addition or alternatively, the propulsion device (200) may be accommodated in the outer housing portion (170) such that a user is prevented from touching the propulsion device (200).

Disclosed is a fuselage assembly (100) configured to be attached to a mast assembly (50) of a powered hydrofoil watercraft (1). The fuselage assembly (100) comprises a mast assembly fixation section (106) and an outer housing portion (170) which accommodates, in particular surrounds or encases, a propulsion device (200), in particular an impeller (201), and which outer housing portion (170) at least partially limits an outer dimension of a flow channel (161) through which water is transported during operation of the hydrofoil watercraft (1). The outer housing portion (170) comprises an attachment portion (310) on which a tail unit (300), in particular 10 comprising a stabilizing member (301) such as a stabilizing wing (302), is formed or attachable thereto. In addition or alternatively, the propulsion device (200) may be accommodated in the outer housing portion (170) such that a user is prevented from touching the propulsion device (200).

The present invention relates to a resiliently flexible fin for a surfboard or another surface watercraft, the resiliently flexible fin comprising a titanium or titanium alloy core and an opening in the trailing edge that enables a portion of the rear of the fin to resiliently flex against the force of water as the surfboard is turned, which can generate additional forward thrust for the surfboard as the surfboard exits the turn and the fin returns to its unflexed state displacing water in its path with force.

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 fin for a slalom water ski includes a planar body with a convex leading edge and a slot proximate such leading edge. The slot has an arcuate front or leading edge and a wavy rear edge defined by alternating crests and troughs or projections which allow the fin to be smaller without compromising its ability to support ski acceleration. The smaller size allows the ski to be turned more easily. A line of small holes extending in a row proximate the leading edge of the fin body can achieve the same result.

An electronically powered, light emitting fin used with a surfboard or paddleboard, or similar water sports board. The fin is configured to be attached to the water sports board to provide illumination under the board when using the device. The lighted fin may be particularly useful when using the water sports board at night to illuminate water beneath the board.

A hydrofoil system is disclosed, having a fuselage with a propeller mounted to one end of the fuselage and a wing extending laterally from the fuselage. The fuselage is configured for removable attachment to a mast, so that the mast when attached extends from the fuselage in a direction substantially orthogonal to the longitudinal axis and also substantially orthogonal to the wing. A tail wing is connected to the fuselage by a tail strut, so that the tail wing is positioned beyond the end of the fuselage to which the propeller is attached. A motor is housed in the fuselage and has a cable connected thereto, the cable extending outside the fuselage, wherein a removable sealing system inhibits water ingress to the motor at the location where the cable is connected when the sealing system is installed in the fuselage.

A fin for a slalom water ski includes a planar body with a convex leading edge and a slot proximate such leading edge. The slot has an arcuate front or leading edge and a wavy rear edge defined by alternating crests and troughs or projections which allow the fin to be smaller without compromising its ability to support ski acceleration. The smaller size allows the ski to be turned more easily. A line of small holes extending in a row proximate the leading edge of the fin body can achieve the same result.

A fin for use on a surfboard or another watercraft comprising a fin section that can be releasably coupled to the base of the fin, and the fin section can be slidably adjusted relative to the base in a direction towards the leading edge or the trailing edge of the fin. Following adjustment, the position of the fin section can be secured to the base with one or more locking means.

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 surfboard out of the water.