A recreational sport boat includes a hull, having starboard and port sides and a transom, and a wake-modifying devices positioned aft of the transom. The wake-modifying device includes a plate-like member and at least one downturned surface. The wake-modifying device is pivotable between a non-deployed position and a deployed position about a pivot axis. 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 recreational sport boat includes a hull, having starboard and port sides and a transom, and a wake-modifying devices positioned aft of the transom. The wake-modifying device includes a plate-like member and at least one downturned surface. The wake-modifying device is pivotable between a non-deployed position and a deployed position about a pivot axis. 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.

An amphibious vehicle that can reduce wave drag at the time of hydroplaning and can improve propulsion performance of the vehicle body. The amphibious vehicle includes a vehicle body capable of moving on water and on land, a front flap with a rear end being fixed to a lower end of the vehicle body, a rear flap with a front end being fixed to a rear part of the vehicle body, and a pair of keels provided along a travel device provided on both sides of the vehicle body on a bottom surface of the vehicle body.

An amphibious vehicle that can reduce wave drag at the time of hydroplaning and can improve propulsion performance of the vehicle body. The amphibious vehicle includes a vehicle body capable of moving on water and on land, a front flap with a rear end being fixed to a lower end of the vehicle body, a rear flap with a front end being fixed to a rear part of the vehicle body, and a pair of keels provided along a travel device provided on both sides of the vehicle body on a bottom surface of the vehicle body.

A high speed ship configuration for achieving a plane state efficiently, with threshold power available in fully loaded cargo ship. The system may include a boost phase assist structure to assist in the achievement of a plane state. The boost assist may be external or internal to the ship. The boost assist may provide power and/or lift assist. One embodiment may include a launch rail. In one embodiment, the configuration includes a retractable lateral wing structure disposed toward the stern of the vessel and containing auxiliary power providing thrust for the vessel. The wing structure is deployed during an initial boost phase acceleration and may be stowed in the vessel once the vessel achieves full plane operation. In one embodiment, the boost power structure may include propeller drive, paddle drive, or waterjet drive. The boost power structure may provide buoyancy and/or hydrodynamic trim to assist in achieving plane state operation.

A high speed ship configuration for achieving a plane state efficiently, with threshold power available in fully loaded cargo ship. The system may include a boost phase assist structure to assist in the achievement of a plane state. The boost assist may be external or internal to the ship. The boost assist may provide power and/or lift assist. One embodiment may include a launch rail. In one embodiment, the configuration includes a retractable lateral wing structure disposed toward the stern of the vessel and containing auxiliary power providing thrust for the vessel. The wing structure is deployed during an initial boost phase acceleration and may be stowed in the vessel once the vessel achieves full plane operation. In one embodiment, the boost power structure may include propeller drive, paddle drive, or waterjet drive. The boost power structure may provide buoyancy and/or hydrodynamic trim to assist in achieving plane state operation.

An amphibious vehicle includes a vehicle body; a flap supported at a lower portion in a traveling direction of the vehicle body to be able to swing in a direction in which an upper edge portion approaches and separates from the vehicle body; a support column which has a fluid actuator capable of expanding and contracting in accordance with a pressure of a working fluid to a cylinder chamber, is connected to the flap in at least a first end portion in a longitudinal direction, and performs adjustment of a swinging angle of the flap by expansion and contraction of the fluid actuator; a power source which supplies the working fluid to the cylinder chamber; and a safety valve which communicates with the cylinder chamber, and opens when an internal pressure of the cylinder chamber becomes greater than a predetermined pressure to be able to discharge the working fluid in the cylinder chamber.

An amphibious vehicle includes a vehicle body; a flap supported at a lower portion in a traveling direction of the vehicle body to be able to swing in a direction in which an upper edge portion approaches and separates from the vehicle body; a support column which has a fluid actuator capable of expanding and contracting in accordance with a pressure of a working fluid to a cylinder chamber, is connected to the flap in at least a first end portion in a longitudinal direction, and performs adjustment of a swinging angle of the flap by expansion and contraction of the fluid actuator; a power source which supplies the working fluid to the cylinder chamber; and a safety valve which communicates with the cylinder chamber, and opens when an internal pressure of the cylinder chamber becomes greater than a predetermined pressure to be able to discharge the working fluid in the cylinder chamber.

A system for a marine vessel operating in a body of water includes a trimmable marine device coupled to and movable with respect to the vessel and an actuator that raises and lowers the marine device. A control module is in signal communication with the actuator. A GPS receiver determines a current and/or predicted global position of the vessel, and a processor accesses a memory storing bathymetry data and retrieves a water depth corresponding to the vessel's current and/or predicted global position. The control module compares the water depth to a depth of the marine device based on the marine device's current position. The actuator raises the marine device in response to the control module determining that the water depth is not enough to accommodate the depth of the marine device at the current position without potential collision between the marine device and the body of water's bottom.

A system for a marine vessel operating in a body of water includes a trimmable marine device coupled to and movable with respect to the vessel and an actuator that raises and lowers the marine device. A control module is in signal communication with the actuator. A GPS receiver determines a current and/or predicted global position of the vessel, and a processor accesses a memory storing bathymetry data and retrieves a water depth corresponding to the vessel's current and/or predicted global position. The control module compares the water depth to a depth of the marine device based on the marine device's current position. The actuator raises the marine device in response to the control module determining that the water depth is not enough to accommodate the depth of the marine device at the current position without potential collision between the marine device and the body of water's bottom.