Abstract: An active stabilizing device for a primary damping of rolling movements of a ship or other watercraft including a hull including at least one positioning device having a drive journal and a stabilizing fin with a stabilizing surface and a root, the drive journal being attached to the stabilizing fin at the root, the stabilizing surface having a leading edge and a trailing edge and being configured to be disposed underwater. The positioning device is configured to set an angle of attack of the stabilizing fin by rotating the drive journal about a first axis of rotation and to pivot the drive journal about a second axis of rotation to move the stabilizing fin between a forward position and a rearward position relative to a bow of the watercraft.

Abstract: An easily assembled highly portable watercraft comprising a modular boat system that seats one or more operators and is comprised of four or more pontoons connected to downward-sloping diagonally-placed outrigger beams with attached stiffeners connecting to a bridge-deck. The portable watercraft can be rowed, poled, propelled by fins or propellers, and sailed, for example, by an operator situated on the bridge-deck. The pontoons, outriggers, bridge-deck, and other aspects are easily interchangeable to conform to numerous configurations making a custom watercraft that is tailorable to varying water conditions.

Abstract: A tri-foil sailboat and powerboat are described having retractable hydrofoils with independently adjustable angles of attack allowing the hull to be fully lifted from the water and the sailboat to travel at more than twice the wind speed.

Abstract: A hydrofoil assembly for a waterborne vessel, comprising: a body; a hydrofoil mounted to the body, the hydrofoil being adjustable to vary its lift characteristics; and a control mechanism operative to control the adjustment of the hydrofoil assembly relative to the support.

Abstract: A watercraft having a hull, a mast with sail, an aft rudder and a hydrofoil projecting below the bottom of the hull. The hydrofoil is pivotly connected to the hull enabling the hydrofoil to pitch on a pivot axis which is essentially perpendicular to the longitudinal axis of the hull. The hydrofoils have a vertical part which produces lateral forces to accelerate the boat in turns and resist lateral forces from the sail, and a vertical portion which curves into the horizontal portion which produces vertical lift. The angle of incidence of the hydrofoil is controlled by a sensor arm carrying a trailing sensor.

Abstract: An apparatus for a sailboat which can be used to oppose heeling caused by the wind on the sail. The apparatus includes hydrofoils which are substantially aligned with the leeway angle. In one embodiment, the hydrofoils can be withdrawn from holders and re-inserted or shifted in position when the boat tacks and the wind comes from the other side. In another embodiment, the hydrofoils can automatically assume a position substantially parallel to the leeway angle when the boat is sailing.

Abstract: A turbine integrated within a hydrofoil extracts energy from a free-flowing motive fluid. In the preferred embodiment, the turbine is of the crossflow variety with runner blades coaxial to the width of the hydrofoil. The foremost edge of the hydrofoil comprises a slot covered by a continuously adjustable gate for controlling the overall drag imposed by the turbine. The hydrofoil mounts to a sailing vessel by means of a gimbal on a structure affixed to the hull, enabling the turbine to optimally respond to changes in direction of the free-flowing motive fluid and facilitating guidance and stability of the vessel.

Abstract: A hydrofoil assembly for a waterborne vessel, comprising: a body; a hydrofoil mounted to the body, the hydrofoil being adjustable to vary its lift characteristics; and a control mechanism operative to control the adjustment of the hydrofoil assembly relative to the support.

Abstract: A marine vessel comprising: a command module; first and second buoyant tubular foils; and first and second struts for connecting the first and second buoyant tubular foils to the command module, respectively; wherein the first and second buoyant tubular foils provide substantially all of the buoyancy required for the marine vessel; and wherein the marine vessel further comprises first and second engines enclosed within the first and second buoyant tubular foils, respectively, and first and second propulsion units connected to the first and second engines, respectively, for moving the marine vessel through the water.

Abstract: A watercraft having a hull, a mast with sail, an aft rudder and a hydrofoil projecting below the bottom of the hull. The hydrofoil is pivotly connected to the hull enabling the hydrofoil to pitch on a pivot axis which is essentially perpendicular to the longitudinal axis of the hull. The hydrofoils have a vertical part which produces lateral forces to accelerate the boat in turns and resist lateral forces from the sail, and a vertical portion which curves into the horizontal portion which produces vertical lift. The angle of incidence of the hydrofoil is controlled by a sensor arm carrying a trailing sensor.

Abstract: A personal wind-powered hydrofoil watercraft having a sail supported by a mast coupled to a buoyant body, where the mast is tiltable forward and backward but not side to side, in order to prevent excessive rolling of the buoyant body when it is lifted clear of the water on the hydrofoils. Additionally, the buoyant body may be in the shape of a pontoon, the watercraft may be steerable by a steering mechanism actuated by a human operator's foot or feet, and the front hydrofoil may be associated with a surface tracking means in order to stabilize the altitude of the watercraft.

Abstract: A tri-foil sailboat and powerboat are described having retractable hydrofoils with independently adjustable angles of attack allowing the hull to be fully lifted from the water and the sailboat to travel at more than twice the wind speed.

Abstract: A sailboat having a hull, a sail assembly and a keel is additionally equipped with an assembly of stationary or pivoted hydrofoils—the object of the present invention. The foils are mounted on both sides of the hull and placed above and below center of mass (C.G.) of a sailboat in a biplane manner that allows efficiently compensating yacht's roll. The assembly of stationary hydrofoils of the present invention, which upper foils can go out of water when a yacht is heeling over also develop momentums efficiently compensating wind list. Another embodiment of the present invention, which comprises hydrofoils assembled in a triplane manner, allows efficiently compensating wind list at low sailboat speed. Biplane assembly of pivoted hydrofoils of the present invention allows compensation all adverse momentum affecting a sailing vessel.

Abstract: A monohull sailing vessel (102, 202, 402, and/or 502) having a lifting hydrofoil (104 and/or 204) having a stowed position and a deployed position in which the hydrofoil extends outward of a leeward side of the hull (138). The hydrofoil may have an aspect ratio greater than 2.5:1, may be oriented at an angle of attack between 2 and 6 degrees, and may be oriented at a mean angle (124) of between 5 and 20 degrees to horizontal. The hydrofoil may have a projected area adapted provide a righting moment and a lifting force for partially but not fully lifting the vessel out of the water. The hydrofoil may have an exposed span (112) that is greater than about 7% of a height of the tallest mast (134). The vessel may include an actuation assembly (128, 228, 308, and/or 316) for moving the hydrofoil between the stowed and deployed positions.

Abstract: A sailboat has a preferably solid hull with lateral and longitudinal symmetry, a centrally located ring-shaped seat secured to a central portion of the top of an hull, a selectively rotatable carousel being mounted about an outer circumferential wall of said ring-shaped seat, a frame being secured to said carousel for retaining a pair of spaced apart identical sails that slant inward toward one another, a pair of removable selectively rotatable cylindrical booms being positioned on the frame with an associated halyard system for controllably furling and allowing easy reefing of the pair of sails, a pair of selectively removable rotatable hydrofoils each serving as a rudder and centerboard projecting downward from the bottom of and proximate the ends of the hull, a steering wheel being secured to the hull at the center of the ring-shaped seat and linked to each of the hydrofoils, whereby the carousel can be selectively rotated to position the sails at any desired angular position relative to the direction of t

Abstract: A monohull sailing vessel (102, 202, 402, and/or 502) having a lifting hydrofoil (104 and/or 204) having a stowed position and a deployed position in which the hydrofoil extends outward of a leeward side of the hull (138). The hydrofoil may have an aspect ratio greater than 2.5:1, may be oriented at an angle of attack between 2 and 6 degrees, and may be oriented at a mean angle (124) of between 5 and 20 degrees to horizontal. The hydrofoil may have a projected area adapted provide a righting moment and a lifting force for partially but not fully lifting the vessel out of the water. The hydrofoil may have an exposed span (112) that is greater than about 7% of a height of the tallest mast (134). The vessel may include an actuation assembly (128, 228, 308, and/or 316) for moving the hydrofoil between the stowed and deployed positions.

Abstract: A wind driven sailing craft is disclosed with a hydrofoil element which provides variable lift to the stern of the craft to maintain a level trim when the craft is operated under power propulsion. The hydrofoil element includes a hydrofoil wing which rotates on a transverse axis to provide the desired lift.

Abstract: A pivotable deployable bulb mounted foil apparatus for a sailboat can pivot a foil mounted within a keel bulb remotely as needed to provide lateral resistance for the sailboat. The foil or foils can be rotated between a nested position for greater speed when the foils are not needed for lateral resistance in the water to an extended or operative position when needed for lateral resistance. The pivotal bulb mounted foil is especially adapted for use with a canting keel where the sailboat loses its lateral resistance from the keel when the keel is canted.

Abstract: A modified mast and keel system for a sailing vessel. The mast is gimbaled to the hull, so that it can move in a pitch roll. A downward extension of the mast pivotally connects to a winged keel. An aft strut also pivotally connects to the hull and pivotally connects to the winged keel. The hull, the mast extension, the winged keel, and the aft strut combine to form a traditional four bar linkage which is used to adjust the angle of attack of the winged keel with respect to the vessel. The winged keel moves with the mast in pitch and roll. It also includes a hydrofoil having an angle of attack which can be changeable in response to the pitching of the mast. This hydrofoil thereby generates downforce which counteracts the lifting forces created by the mast. It also creates lateral forces to counteract the sideslip of the vessel.

Abstract: A sailing craft including a single hydrofoil assembly, an aerofoil assembly, and a hull assembly with a rigid beam interconnecting the hydrofoil assembly, the aerofoil assembly, and the hull assembly. The hull is separate and displaced from the hydrofoil assembly and is, in use, supported above the water by the rigid beam. The hydrofoil assembly, the aerofoil assembly, and the hull assembly are preferably interconnected such that the hydrofoil assembly and the aerofoil assembly are disposed at opposite ends of the rigid beam and the hull is connected to the beam therebetween.

Abstract: The invention features a hydrofoil device for reducing wake formation on a partially immersed hull of a sailing or motor vessel.

Abstract: A sailing vessel has a hull, two outriggers, one on either side of the hull, a rudder, and rigging supporting at least one sail. Wings are secured to the outriggers and arranged to be located below the surface of the water during sailing. The leeward wing being arranged, as the vessel moves through water, to exert an upwards directed force and the windward wing being arranged to exert a downwards directed force to counteract the rotational force from the sails.