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.

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.

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 further includes an accommodating recess formed therein, and the accommodating recess is 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, and the retreat surface extends toward the stern side in a downward direction and is connected to the bottom.

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 further includes an accommodating recess formed therein, and the accommodating recess is 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, and the retreat surface extends toward the stern side in a downward direction and is connected to the bottom.

Apparatus and associated methods relate to configuring a watercraft propulsion system and control surface to generate a higher rate flow and a lower rate flow governed by the watercraft's yaw slip angle, adjusting the rate difference between the higher rate flow and the lower rate flow based on adjusting the yaw slip angle determined as a function of the control surface position and the propulsion system thrust vector, and directing by the watercraft the higher rate flow to converge with the lower rate flow to create a wave. The propulsion system may be a plurality of independently adjustable propulsion methods permitting propulsion system differential thrust vector adjustment. The control surface may be adjustable 360 degrees in the plane of the watercraft longitudinal axis. The yaw slip angle may be adjusted based on sensor information. Exemplary implementations may increase wave quality and improve maneuverability of a watercraft configured to create waves.

Apparatus and associated methods relate to configuring a watercraft propulsion system and control surface to generate a higher rate flow and a lower rate flow governed by the watercraft's yaw slip angle, adjusting the rate difference between the higher rate flow and the lower rate flow based on adjusting the yaw slip angle determined as a function of the control surface position and the propulsion system thrust vector, and directing by the watercraft the higher rate flow to converge with the lower rate flow to create a wave. The propulsion system may be a plurality of independently adjustable propulsion methods permitting propulsion system differential thrust vector adjustment. The control surface may be adjustable 360 degrees in the plane of the watercraft longitudinal axis. The yaw slip angle may be adjusted based on sensor information. Exemplary implementations may increase wave quality and improve maneuverability of a watercraft configured to create waves.

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.

A linear drive system adapted for repetitive driving using a linear motor. The drive system may be used to power pumping hydrofoils which drive a boat or ship. Linkages are used to maintain the driven portion in linear motion. A coupled dual drive system in which two driven portions are coupled such that their coupled motions travel at the same velocity in opposed directions. The coupled linear drive system which may be used as a mechanical power source for drive systems used in transportation and industry. A boat with dual pumping hydrofoils adapted for propel a boat using the hydrofoils for both lift and propulsion.

A linear drive system adapted for repetitive driving using a linear motor. The drive system may be used to power pumping hydrofoils which drive a boat or ship. Linkages are used to maintain the driven portion in linear motion. A coupled dual drive system in which two driven portions are coupled such that their coupled motions travel at the same velocity in opposed directions. The coupled linear drive system which may be used as a mechanical power source for drive systems used in transportation and industry. A boat with dual pumping hydrofoils adapted for propel a boat using the hydrofoils for both lift and propulsion.