A stabilized a hydrofoil water craft comprising: a water-craft base member, a hydrofoil mast having proximal and distal portions; said proximal portion mechanically connected to said bottom side of said water-craft base member, a fuselage mechanically connected to said distal portion of said at least one hydrofoil mast, a rudder configured for controlling a yaw angle of said water craft, an elevator rotatable around an axis lying in a plane parallel to water-craft base member and a stabilization arrangement further comprising at least one sensor configured for detecting a 3D orientation of said water-craft base member, an estimator configured for estimating the 3D orientation, actuators for manipulating the rudder and elevator and a controller for analyzing the estimated 3D orientation and controlling the actuators. In response to a disturb roll inclination of the water craft, the controller generates a command to a rudder actuator to compensate the detected inclination.

A stabilized a hydrofoil water craft comprising: a water-craft base member, a hydrofoil mast having proximal and distal portions; said proximal portion mechanically connected to said bottom side of said water-craft base member, a fuselage mechanically connected to said distal portion of said at least one hydrofoil mast, a rudder configured for controlling a yaw angle of said water craft, an elevator rotatable around an axis lying in a plane parallel to water-craft base member and a stabilization arrangement further comprising at least one sensor configured for detecting a 3D orientation of said water-craft base member, an estimator configured for estimating the 3D orientation, actuators for manipulating the rudder and elevator and a controller for analyzing the estimated 3D orientation and controlling the actuators. In response to a disturb roll inclination of the water craft, the controller generates a command to a rudder actuator to compensate the detected inclination.

A water engagement actuator system and device comprising a rotary actuator connected to a support structure adapted to be connected to a marine vessel is provided. The rotary actuator includes a driven shaft and a undriven slave shaft disposed opposite the driven shaft. The rotary actuator further comprises at least one pair of bearings enclosed within a clean sealed environment; water engagement device having an arced blade connected to the driven shaft; at least one encoder disposed in a space separating the undriven slave shaft from the driven shaft. A controller is communicatively connected to the rotary actuator to command rotation of the driven shaft such that the water engagement device is automatically moved to a position between a retracted position and a deployed position in order to provide dynamic active control of the marine vessel. The rotary actuator is further configured to absorb any hydrodynamic drag load generated from the marine vessel with no more than two rotary shaft seals and counteract any unintended disturbance by automatic deployment of the arced blade—at 100 mm/s or more—into the water and provide dynamic active control of a marine vessel.

A water engagement actuator system and device comprising a rotary actuator connected to a support structure adapted to be connected to a marine vessel is provided. The rotary actuator includes a driven shaft and a undriven slave shaft disposed opposite the driven shaft. The rotary actuator further comprises at least one pair of bearings enclosed within a clean sealed environment; water engagement device having an arced blade connected to the driven shaft; at least one encoder disposed in a space separating the undriven slave shaft from the driven shaft. A controller is communicatively connected to the rotary actuator to command rotation of the driven shaft such that the water engagement device is automatically moved to a position between a retracted position and a deployed position in order to provide dynamic active control of the marine vessel. The rotary actuator is further configured to absorb any hydrodynamic drag load generated from the marine vessel with no more than two rotary shaft seals and counteract any unintended disturbance by automatic deployment of the arced blade—at 100 mm/s or more—into the water and provide dynamic active control of a marine vessel.

Various embodiments are disclosed for a stepped cambered planing hull for a boat including a swept back cambered planing surface having a non-linear distribution of camber. The non-linear distribution of camber along the swept back cambered planing surface may enable stepped cambered planing hulls having high deadrise (i.e., greater than 15 degrees). The stepped cambered planing hull may include a shaped hydrofoil that generates further hydrodynamic lift by piercing the free surface wake produced by the swept back cambered planing surface. The stepped cambered planing hull may have external bottom surfaces adapted at the after-body and transom to accommodate a distinctive profile of the free surface wake produced by the swept back cambered planing surface. The stepped cambered planing hull may include an adjustable interceptor blade to regulate hydrodynamic lift at low speeds or to ensure an optimal dynamic trim angle in a wide range of speeds.

A recreational sport boat includes a hull, having starboard and port sides and a transom, and a pair of wake-modifying devices positioned aft of the transom. One of the wake-modifying devices is positioned on a port side of the boat's centerline and another of the wake-modifying devices is positioned on a starboard side of the boat's centerline. Each wake-modifying device includes a plate-like member and at least one downturned surface at a trailing portion of the plate-like member. Each wake-modifying device is pivotable between a non-deployed position and a deployed position about a pivot axis that is horizontal or inclined no more than about 35° from horizontal. When a wake-modifying device is in the deployed position, the downturned surface is lower than it is in the non-deployed position so as to be able to modify the boat's wake.

A method and apparatus for adding buoyancy to the transom of a boat by attaching buoyant material to the trim tabs, or to the planing surface of the trim tab, or constructing the trim tab itself of buoyant material. The buoyancy can be used to correct listing of a boat, or compensate for outboard engines that are unable to clear the water line when tilted up, or generally raise the stern of the boat while at rest. Buoyancy can be added to conventional trim tab plates or added to vertically extending interceptor blade type trim tabs. The invention also proposes a method by which trim tabs can be attached to the transom or the “step” or “pocket” above by a fixed or manually adjustable linkage, such as with a turnbuckle or jack screw or through-bolted perforated rods.

An attitude detection device includes a rudder angle sensor, a speed sensor, an inertia sensor, and a control device. The rudder angle sensor detects a rudder angle of a ship. The speed sensor detects a speed of the ship. The inertia sensor detects information related to an inertial force applied to the ship. The control device finds a centrifugal force applied to the ship on the basis of a signal output from each of the rudder angle sensor and the speed sensor. The control device acquires an inclination of the ship on the basis of the signal output from the inertia sensor. The control device corrects the inclination of the ship on the basis of the output of the inertia sensor according to the centrifugal force applied to the ship.

A boat stabilizer having an upper harness for attachment to a vessel, the upper harness having an assembly control system for controlling attached wing assemblies, each wing assembly having a wing attached to the assembly control system and a wing mount attached to the wing and the assembly control system. The boat stabilizer may be further comprised of a controllable parasail comprising a parasail canopy, a plurality of parasail cords attached the parasail canopy, a parasail mount attached to the upper harness and the parasail cords, a parasail control rudder attached to each parasail cords, and yaw and pitch controllers, both of which are attached to the parasail control rudder. The assembly control system is configured to work in conjunction with the controllable parasail to provide the desired balance of vertical lift and forward propulsion to the attached vessel, while also providing directional control to the attached vessel.

A boat stabilizer having an upper harness for attachment to a vessel, the upper harness having an assembly control system for controlling attached wing assemblies, each wing assembly having a wing attached to the assembly control system and a wing mount attached to the wing and the assembly control system. The boat stabilizer may be further comprised of a controllable parasail comprising a parasail canopy, a plurality of parasail cords attached the parasail canopy, a parasail mount attached to the upper harness and the parasail cords, a parasail control rudder attached to each parasail cords, and yaw and pitch controllers, both of which are attached to the parasail control rudder. The assembly control system is configured to work in conjunction with the controllable parasail to provide the desired balance of vertical lift and forward propulsion to the attached vessel, while also providing directional control to the attached vessel.