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 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 paddleboard out of the water.

A universal hydrofoil comprises a hydrofoil assembly, a universal mount assembly and a plurality of lateral connectors. The hydrofoil assembly has a longitudinal axis and includes a centerfoil having first and second longitudinal ends. A foil assembly is disposed at the centerfoil second end and includes a fuselage, a wing at a fuselage first end and a tail at a fuselage second end. The universal mount assembly comprises a base having first and second mounting surfaces. The second mounting surface defines a mounting interface configured to reversibly mate with the centerfoil first end. Lateral supports having a pair of arms projecting from a central beam are selectively engageable with the base. The lateral connectors are adjustably secured within the lateral channel and configured to engage a structural feature of a craft.

A hydrofoil assembly adapted to be attached to a watercraft includes a mast having a mast head adapted to be removably engage with the watercraft and disposed exterior to the watercraft. The hydrofoil assembly also includes a propulsion assembly coupled to the mast and including a propeller and an electric motor for rotating the propeller. The hydrofoil assembly also includes at least one wing coupled to the mas. Moreover, the hydrofoil assembly includes a battery coupled to the mast head and adapted to be arranged exterior to the watercraft.

The invention relates to a vessel for operating on a body of water comprising: a non-planing hull having a waterline and a longitudinal direction with a forward portion, an aft portion, and a central portion, the hull being configured to have the aft portion with a smaller water displacement relative to a water displacement at the central portion; and an aft foil affixed to the aft hull portion with one or more connecting members, and below the surface of the water, and spaced from the hull, the aft foil having a span, a chord, and a leading edge and a trailing edge relative to a forward direction, wherein the leading edge of the aft foil is tilted at a downward angle relative to the horizontal, wherein the aft foil has a chord and profile in longitudinal cross section, with a configuration to provide a lifting force, the tilt angle of the chord of the aft foil being measured with respect to the horizontal, and wherein the aft foil is oriented to provide a continuous, upward, forwardly directed component of the lifting force.

A hydrofoil board having a hydrofoil and individually controllable flaps configured to be controlled to stabilize the board in a level position even when incurring waves. The flaps are spaced from the hydrofoil to generate a gap, and direct fluid flowing under the hydrofoil through the gap, and over the flaps. The flaps control the pitch and direction of the hydrofoil board when propelled in motion. A processor uses an internal measurement unit (IMU) to obtain orientation and acceleration information of the hydrofoil board. A global positioning system (GPS) unit is also used as an additional speed and location sensor. The processor combines IMU data with a user/rider's input, such as selected speed and direction via handheld wireless controller, and individually controls the flap motors to position the flaps, and the propulsion motor to set speed. In one example, the controller is configured to bring the hydrofoil board to a complete and stabile stop.

The disclosure includes systems, assemblies, sub-assemblies and methods for removably and securely attaching a hydrofoil to a board used in water sports. At least some of the systems include toolless removable attachment. In various embodiments, the attachment a hydrofoil adaptor mechanically attached to a trench frame by one or more toolless locking assemblies.

A system for a watercraft with a lifting body. The watercraft system includes, in one example, a lifting body configured to couple to a hull of a watercraft and generate dynamic lift during watercraft operation. In the watercraft system, the lifting body includes multiple parabolic curves that define a leading edge of the lifting body and the lifting body has a chord that decreases from a center of the lifting body to each lateral edge of the lifting body.

The water vehicle with hydrofoil includes an above-water platform, a supporting mast connecting the above-water platform with a hydrofoil, including a fuselage with a front wing and a first horizontal stabilizer, drive means (6) for creating horizontal thrust and a second horizontal stabilizer located in the vertical direction between the fuselage and the above-water platform, where the second horizontal stabilizer in the longitudinal direction is being located behind the front wing. It is possible that the second horizontal stabilizer is mounted to the above-water platform, the mast, to the additional structurally supporting parts, to the parts that serve to change the angle of attachment of the main horizontal stabilizer, to the fuselage or drive means by means of a support element with the possibility of changing the vertical position.

The invention relates to a vessel for operating on a body of water comprising: a non-planing hull having a waterline and a longitudinal direction with a forward portion, an aft portion, and a central portion, the hull being configured to have the aft portion with a smaller water displacement relative to a water displacement at the central portion; and an aft foil affixed to the aft hull portion with one or more connecting members, and below the surface of the water, and spaced from the hull, the aft foil having a span, a chord, and a leading edge and a trailing edge relative to a forward direction, wherein the leading edge of the aft foil is tilted at a downward angle relative to the horizontal, wherein the aft foil has a chord and profile in longitudinal cross section, with a configuration to provide a lifting force, the tilt angle of the chord of the aft foil being measured with respect to the horizontal, and wherein the aft foil is oriented to provide a continuous, upward, forwardly directed component of the lifting force.