The invention concerns a vessel for floating in a body of water, comprising a hull having an aft hull section and an aft body arranged at a distance from the aft hull section, thereby forming a passage into which water can flow. The aft body and the aft hull section are designed to minimize the vessel's stern wave during forward movements.

A hydrofoil watercraft system comprising: a flotation device; a downward mast extending from a bottom surface of the flotation device; a fuselage, a foil wing extending from one first end of the fuselage; and a plurality of fins independently movable independent of one another, wherein at least two of the movable fins extend in opposite directions from one second end of the fuselage, where the movable fins are used for steering the watercraft. The system further includes a controller for receiving user input, wherein the controller drives the movable fins respectively based on the user input. One of the movable fins is driven by the controller to rotate along a first axis while another of the movable fins is driven by the controller to rotate along a second axis, wherein the first axis and the second axis are substantially symmetrical with respect to the fuselage.

A hydrofoil system for a hydrofoil equipped watercraft with cooperating fuselage portion that have tapered sections. The tapered sections are configured to form an overlapping stacked wedge within an inner passageway of a collar so that the collar frictionally engages the stacked tapered sections when the first fuselage portion and the second fuselage portion are drawn together longitudinally.

Systems, devices, and methods are provided for operating a watercraft vessel. The system can include a communication unit configured to receive a position signal and a velocity signal of the first vessel. The system can include a first sensing unit configured to determine a relative position signal of one or more nearby vessels including the first vessel, a second sensing unit configured to detect and measure a fluid velocity field of a vortex around the watercraft vessel, and a third sensing unit configured to detect and measure an efficiency gain from a lifting force experienced by watercraft vessel operating in an upwash region of the vortex. And the system can include a control unit configured to maneuver the watercraft vessel from a first position to an optimum position.

A foil displacement system includes one or more foils that can be deployed and stowed. When deployed, each foil can exert downforce or uplift depending on its orientation. For example, each foil may be positioned to have an angle of attack that creates a downward force effectively transmitted to the hull to pull the hull deeper within the water to, for example, create a larger wake. Use of the foil displacement system can enhance or replace the use of a ballast tank system, can be integrated into a new boat or retrofitted to existing boats, can be electronically or manually positioned, can enhance activities such as wake surfing, wake boarding, water skiing or other similar or related water sports.

The invention relates to a hydrofoil system for a marine vessel comprising a hull (101), the hydrofoil system comprising at least one pair of foldable hydrofoils (109, 110) which are pivoted relative to the marine vessel, wherein each hydrofoil (109, 110) is controllable by at least one actuator (930) for displacement of the at least one pair of foldable hydrofoils in a lateral direction of the marine vessel between a stowed position and a deployed position. Each foldable hydrofoil (109, 110) is hinged relative to the hull above the water line on opposite sides of the marine vessel. A first portion (111) of each hydrofoil extends adjacent the hull (101) towards the water line of the marine vessel when the hydrofoil is in the stowed position and a second portion (112) comprises a free second end extending under the hull. The second portion (112) is submerged and arranged in a lateral recess (107) behind a stepped hull portion (106) of the marine vessel when the hydrofoil is in the stowed position.

Methods, systems, and devices are provided for a vessel comprising a retractable hydrofoil. The vessel can include a hull and one or more hydrofoil assemblies connected to the hull. Each hydrofoil assembly can further include a support structure and a hydrofoil operably connected to the hull via the support structure. Each of the hydrofoil assemblies can be configured to retract or extend from the hull such that the hydrofoil of each of the hydrofoil assemblies can move away or move close to the hull. During operation, one or more of the hydrofoils can be submerged beneath a water line. Alternatively, during a cruising speed of the vessel, one or more of the hydrofoils retracted from being submerged beneath the water line.

The present invention provides an aquatic moving body configured to move in a state where a main body portion is floated above a water surface, comprising: a first hydrofoil and a second hydrofoil disposed along a left-and-right direction of the aquatic moving body and provided in the main body portion so as to be able to change elevation angles independently of each other; a first propulsion unit provided at an end portion of the first hydrofoil and configured to generate a propulsive force; and a second propulsion unit provided at an end portion of the second hydrofoil and configured to generate a propulsive force, wherein a first partition wall is provided between the first hydrofoil and the first propulsion unit, and a second partition wall is provided between the second hydrofoil and the second propulsion unit.

The invention relates to a system for controlling a hydrofoil boat comprising at least three static pressure or dynamic pressure and water speed sensors submerged in the water and located on the submerged hydrofoils of the boat, an electronic controller on the boat, an actuator for each one of the submerged hydrofoils able to change an angle of attack of its respective hydrofoil. The control system allows boats on hydrofoils to sail in a safe and comfortable way in any wave condition within the sailing limits of traditional boats.

Systems, devices, and methods are provided for operating a watercraft vessel. The system can include a communication unit configured to receive a position signal and a velocity signal of the first vessel. The system can include a first sensing unit configured to determine a relative position signal of one or more nearby vessels including the first vessel, a second sensing unit configured to detect and measure a fluid velocity field of a vortex around the watercraft vessel, and a third sensing unit configured to detect and measure an efficiency gain from a lifting force experienced by watercraft vessel operating in an upwash region of the vortex. And the system can include a control unit configured to maneuver the watercraft vessel from a first position to an optimum position.