A hydrofoil craft includes: a hull including a bottom that spreads from a bow to a stern; and a hydrofoil mechanism provided on the bow side of the hull. The hull includes an accommodating recess formed therein, the accommodating recess being recessed toward the stern side between the bow and the bottom to accommodate the hydrofoil mechanism. A retreat surface is formed between the bottom and a recess main surface facing the bow side in the accommodating recess, the retreat surface extending toward the stern side in a downward direction and being connected to the bottom.

Embodiments described herein relate generally to a sailing vessel that can substantially obviate the heeling problem experienced by classical sailboats. During navigation, the sailing vessel is driven forward by an aerodynamic force exerted by wind on the sail, and balanced by a hydrodynamic force exerted by water on a float on the stern of the sailing vessel, the aerodynamic force and the hydrodynamic force being parallel or substantially parallel to a longitudinal axis of the sailing vessel.

Embodiments described herein relate generally to a sailing vessel that can substantially obviate the heeling problem experienced by classical sailboats. During navigation, the sailing vessel is driven forward by an aerodynamic force exerted by wind on the sail, and balanced by a hydrodynamic force exerted by water on a float on the stern of the sailing vessel, the aerodynamic force and the hydrodynamic force being parallel or substantially parallel to a longitudinal axis of the sailing vessel.

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.

The invention relates to a hydrofoil for a watercraft including a fuselage and two wings arranged on either side of the fuselage and designed to provide hydrodynamic lift to the hydrofoil when it is moving through the water. According to the invention, the two wings are rotatable relative to the fuselage between a deployed position when the hydrofoil is stationary, and a retracted position towards a rear part of the fuselage by the water pressure exerted on the wings when the hydrofoil is moving through the water.

This disclosure describes a vehicle configured and arranged to generate lift and drag using a plurality of lifting or control surfaces including a water-piercing hydrofoil disposed below said vehicle, and a method for real-time control of said lifting or control surfaces by controlling at least the hydrofoil with an actuator that is actuated responsive to measured input signals including forces on said hydrofoil.

A method and a controller unit for controlling motion of a watercraft with a hydrofoil) obtains information indicating shape of water surface in front of the hydrofoil. The controller unit further predicts wave acceleration of the watercraft using a neural network. Furthermore, the controller unit determines a target route and corresponding total acceleration of the watercraft under a set of constraints. The total acceleration is minimized when the watercraft travels according to the target route. The set of constraints includes: a first constraint that the hydrofoil stays within an interval relative to the water surface, and a second constraint relating to magnitude of acceleration derived from maximum AoA and the predicted wave acceleration. The controller unit calculates an AoA for the target route. Next, the controller unit sends a signal for adjusting the hydrofoil according to the AoA.

The invention relates to a hydrofoil for a watercraft including a fuselage and two wings arranged on either side of the fuselage and designed to provide hydrodynamic lift to the hydrofoil when it is moving through the water. According to the invention, the two wings are rotatable relative to the fuselage between a deployed position when the hydrofoil is stationary, and a retracted position towards a rear part of the fuselage by the water pressure exerted on the wings when the hydrofoil is moving through the water.

The control system of the vessel with moving underwater wings allows steering with the wings, while in turn the front pair of wings turns in the direction of the turn, the rear pair of wings turns in the opposite direction. The wing pairs settled in the direction of the turn radius. This reduces the turning radius and the roll of the vessel in comparison with conventional steering systems, increasing the maneuvrability of the vessel. The minimal roll of the vessel in the turns allows for an even and maximum distance between the surface and the entire hull of the vessel.

A hydrofoil arrangement for a hydrofoil watercraft, comprising a base unit attachable to a body of the hydrofoil watercraft having a longitudinal extension extending in a longitudinal direction; a lifting wing; and first and second struts attached to the lifting wing and pivotally attached to the base unit so as to be rotatable in relation to the base unit. The lifting wing has a longitudinal extension. The first and second struts are configured to attach the lifting wing to the base unit such that the longitudinal extension of the lifting wing extends in the direction of a transverse axis transverse to the longitudinal direction. The struts and the lifting wing are rotatable about a first pivot axis in relation to the base unit, the first pivot axis being transverse to the transverse axis and the longitudinal direction. The struts are configured to rotate about the transverse axis in relation to the base unit while the struts and the lifting wing rotate about the first pivot axis.