A multihull watercraft has at least three hulls extending longitudinally along the watercraft. The hulls at least partly define a port side tunnel and a starboard side tunnel therebetween. A port deflection device is configured to engage water in response to the watercraft leaning toward the port side when turning. The port deflection device is laterally aligned with the port side tunnel. A starboard deflection device is configured to engage water in response to the watercraft leaning toward the starboard side when turning. The starboard deflection device is laterally aligned with the starboard side tunnel. Each of the deflection devices includes an angled surface extending downwardly and rearwardly from an upper tunnel surface of a corresponding one of the tunnels. The angled surface is positioned to remain above a water line when the multihull watercraft is at rest on water.

A multihull watercraft has at least three hulls extending longitudinally along the watercraft. The hulls at least partly define a port side tunnel and a starboard side tunnel therebetween. A port deflection device is configured to engage water in response to the watercraft leaning toward the port side when turning. The port deflection device is laterally aligned with the port side tunnel. A starboard deflection device is configured to engage water in response to the watercraft leaning toward the starboard side when turning. The starboard deflection device is laterally aligned with the starboard side tunnel. Each of the deflection devices includes an angled surface extending downwardly and rearwardly from an upper tunnel surface of a corresponding one of the tunnels. The angled surface is positioned to remain above a water line when the multihull watercraft is at rest on water.

A modified V-hull boat has a keel having a horizontal cross-sectional profile of an inverted foil. The leading edge of the keel is a sharp point and the front region of the keel tapers outward along the length of the keel until it reaches its widest point. The widest point is aligned with the center of gravity of the hull. The trailing edge is a rounded blunt edge. The aft region of the keel is substantially shorter in length than the front region of the keel.

A modified V-hull boat has a keel having a horizontal cross-sectional profile of an inverted foil. The leading edge of the keel is a sharp point and the front region of the keel tapers outward along the length of the keel until it reaches its widest point. The widest point is aligned with the center of gravity of the hull. The trailing edge is a rounded blunt edge. The aft region of the keel is substantially shorter in length than the front region of the keel.

Embodiments of the present apparatus and method feature a permanently fixed canted keel. The apparatus and method feature tacking maneuvers which shift the sail element and reverse the direction of the hull form.

Embodiments of the present apparatus and method feature a permanently fixed canted keel. The apparatus and method feature tacking maneuvers which shift the sail element and reverse the direction of the hull form.

An apparatus can include a base assembly and a pivot assembly coupled to the base assembly. The apparatus can include a carriage coupled to the pivot assembly. The carriage can be shaped to receive a compass streamer telemetry unit (CSTU). The carriage can be configured to secure the CSTU. The pivot assembly can be rotatably coupled to the base assembly to adjust a pitch of the carriage. The carriage can be rotatably coupled to the pivot assembly to adjust roll of the carriage.

A structure for reducing the drag of a ship and its application thereof is provided. The structure for reducing the drag of a ship comprising at least one turbulence generator which is installed on the side surface between the widest section and the aft end or on the bottom surface between the deepest portion and the aft end of the ship. The arrangement of the turbulence generator can generate turbulence to reduce the drag of the ship, and thereby increase the speed of the ship or reduce fuel consumption as well.

A structure for reducing the drag of a ship and its application thereof is provided. The structure for reducing the drag of a ship comprising at least one turbulence generator which is installed on the side surface between the widest section and the aft end or on the bottom surface between the deepest portion and the aft end of the ship. The arrangement of the turbulence generator can generate turbulence to reduce the drag of the ship, and thereby increase the speed of the ship or reduce fuel consumption as well.

An aquatic vessel may include contra-rotating propellers and a hull mold with a keel pad sectional extended from a hull planing surface to a location on the hull mold at which a propeller shaft exits a propeller shaft tunnel at an aft transom edge of the hull mold and at a forward portion of the keel pad sectional, with sides of the propeller shaft tunnel formed into directional ports to increase a flow of water into the propeller shaft tunnel.