A fully electric hydrofoil boat comprises an elongated hull, a front canard hydrofoil supported by a front support system configured to raise or lower thereof, and a pair of independently-controlled port and starboard rear stowable hydrofoils supported by their respective rear support systems, configured to raise or lower the rear hydrofoils to a selected depth or tilt them out of the water when docking or transporting the boat on a trailer. The hull has a cut-out section in the front portion sized to fit the front canard hydrofoil out of the water if desired. The boat may operate energy-efficiently in a hydrofoil flight mode at high speeds or in a displacement mode at slow speeds when the hydrofoils are in their raised positions.

A hydrofoil vehicle comprises a frame and at least one foil. The vehicle comprises a moveable control surface configured to control a pitch of the vehicle, in use. A locking mechanism is provided for restricting movement of the control surface when the vehicle is not foiling, for example during launching. In examples, the locking mechanism activates automatically when the hydrofoil vehicle is not foiling. In examples, the vehicle is human powered.

A watercraft fin that dynamically keep a neutral alignment within the range of angles a user chooses to have and/or change in respond to the flow conditions so reducing drag. Hence, this invention is such to enable a fin to rotate within a range of angles via a rotary bearing and bearing housing which are to receive a fin having a journal base. The housing is to be fitted to a watercraft such as a surfboard, the housing having a changeable circular keyway to loosely receive a shear key at the underside of the journal base as to allow free circular motion of the shear key and correspondingly the journal base and the fin within the limits of the selected circular length of the keyway. In one form the fin is fitted with a root portion adapted to be inserted into a receiving portion extending radially in the journal base and trapped within the bore of the bearing.

A fully electric hydrofoil boat comprises an elongated hull, a front canard hydrofoil supported by a front support system configured to raise or lower thereof, and a pair of independently-controlled port and starboard rear stowable hydrofoils supported by their respective first and second rear support systems, in turn configured to raise or lower the first and second rear hydrofoils to a selected depth or tilt them out of the water when docking or transporting the boat on a trailer. The hull has a cut-out section in the front portion sized to fit the front canard hydrofoil to be out of the water if desired. The boat may operate energy-efficiently in a hydrofoil flight mode at high speeds or in a displacement mode at slow speeds when the hydrofoils are in their raised positions.

A hydrofoil boat incorporates an elongated hull with front and rear portions and deployable hydrofoils for enhanced performance and maneuverability. A front canard hydrofoil is mounted on a front support system positioned at the hull's front portion, configured to be moved between a stowed position and an operating position. The rear portion of the elongated hull supports a pair of rear hydrofoils, each mounted on respective rear support systems. Each rear hydrofoil integrates a motor-driven propeller, with the rear support systems configured both to raise or lower the hydrofoils between stowed and operating positions and to rotate the propellers about vertical axes to facilitate directional steering. The arrangement allows selective deployment of the front and rear hydrofoils above or below the water line, enabling efficient lift, reduced drag, and improved control. The system further enables the retrieval of one or all the hydrofoils above the water line when not in use.

A hydrofoil boat (100), having a T foil comprising an underwater mast (41) and an elongated horizontal hydrofoil (47) The draft and underwater beam of the boat can be reduced by sliding the mast upwards and rotating the hydrofoil from the normal transverse orientation to a fore-and-aft direction.

A marine propulsion system includes wings with a hydrofoil shaped geometry arranged for mounting on opposite side sections of a vessel comprising at least one hull adjacent the transom. Each wing includes a first section extending downwards along the side of the hull and at least partially below the waterline in its operative position. Each wing includes a second section extending towards the central longitudinal axis of the hull in its operative position. The second section each wing is arranged to support at least one propulsor. The first section of each wing is mounted rotatable about a vertical axis.