A steering device having two rudder plates vertically suspended at a distance from an outer edge of a propeller. The rudder plates are biaxially arranged and symmetrically rotate around a screw shaft within a propeller radius from a screw shaft center, on a propeller rotation plane, and are turned from aside the propeller to downstream of the propeller by rotation of the steering shafts, each of which is driven independently by two hydraulic driving mechanisms. The steering action of the steering device has two modes: the two-independent mode, where the plates rotate in the same direction, and the two-same direction modes, where the plates move in different directions. A method for steering the same to enhance a thrust flow by increase in a propeller rate is also provided.

A trimmable rudder system for a marine vessel such as a planing power boat, the system including a pair of rudder assemblies, each of which includes a rudder blade movably coupled to the hull by way of a ball-and-socket joint. Each rudder assembly includes a rudder shaft that extends from the rudder blade through the ball-and-socket joint and can be rotated for rotating the rudder blade to steer the power boat. Each rudder shaft may be operably coupled to a pair of actuators configured to control trim and camber positions of the rudder blade so that the pair of rudder blades can collectively achieve a desired hull trim change, including listing control and planing control of the power boat. Steering position, trim position, and camber position of the rudder blades may be simultaneously changed.

The invention is an air propelled boat that has a triangular shaped hydroplaning monohull which has surface adhesion characteristics by means of a concave bottom hull. The invention also has aircraft-like control surfaces (5,6) for safety and control at high speeds. The invention is the only monohull marine craft which produces aerodynamic lift without wings and has air based propulsion (4), air based control surfaces and a unique concave planing hull.

A steering device in which a rudder plate is vertically suspended at a positive minimum distance from an outer edge of a propeller having a radius R from a steering shaft which is biaxially arranged and symmetrically rotates around a screw shaft within a propeller radius R from a screw shaft center, on a propeller rotation plane, and can be turned from aside of a propeller to a downstream of the propeller by rotation of the steering shafts, each of which is driven independently by two hydraulic driving mechanisms, and the steering device is characterized in that the steering action is divided into two modes: the two-independent mode and the two-same direction modes, and each mode is adapted as follows: at the time of ahead condition, each one of the two rudder plates is retained on both sides of a propeller parallel with a ship axis, and at the time of veering of the two-same direction mode, a rudder plate opposite to a veering direction turns 45 from aside of the propeller to the downstream of the propeller, and the other rudder plate turns 45 from aside of the propeller to the upstream of the propeller, and at the time of veering of the two-independent mode, the rudder plate opposite to a veering direction turns 45 from aside of the propeller to the downstream of the propeller, and simultaneously, the other rudder plate turns from aside of the propeller to the upstream of the propeller to take a rudder angle of 90 or more, to generate a thrust flow, and a method for steering the same to enhance a thrust flow by increase in a propeller rate.

A pontoon pedal boat includes a multi-piece frame, removable outriggers, inflatable pontoons, and a multi-section pedal drivetrain. The boat may be disassembled and placed into a small suitcase sized storage case to allow for easy transport of the boat. The boat and storage case are lightweight and the boat may be easily transported to many locations for use.

To provide a gate rudder capable of reducing energy consumption during a voyage of a ship. A gate rudder including a pair of rudders including a left rudder and a right rudder disposed left and right, respectively, of a propeller at a stern, wherein each of the rudders includes a first rudder portion extending in a horizontal direction and a second rudder portion linearly extending in a vertical direction in rear view, wherein a rudder chord length of the second rudder portion in a front-rear direction is 40 to 100% of a diameter of the propeller, wherein the propeller is provided within a range of 15 to 65% of the rudder chord length from a front edge of the second rudder portion in side view, and wherein a rudder shaft that drives each of the rudders is provided at a position within a range of 30 to 50% of the rudder chord length from the front edge of the second rudder portion in side view.

The present invention discloses a tail rudder control device and a kayak. The tail rudder control device comprises a tail rudder assembly. The tail rudder assembly comprises a tail rudder, a swing mechanism, a traction mechanism and a guide wheel box. The traction mechanism comprises a steering bracket in transmission connection with the swing mechanism and the tail rudder; a rotating shaft in transmission connection with the tail rudder to convert circumferential rotation of the rotating shaft into longitudinal flipping of the tail rudder; a first transmission wheel disposed around the rotating shaft and in transmission connection with a guide wheel set in the guide wheel box; and a second transmission wheel disposed around the rotating shaft, capable of moving axially along the rotating shaft, and having a first motion state where the second transmission wheel rotates with respect to the first transmission wheel, a second motion state where the second transmission wheel rotates synchronously with the first transmission wheel and the rotating shaft, and a third motion state where the second transmission wheel rotates synchronously with the steering bracket and the rotating shaft. The technical solution provided by the present invention effectively achieves the purpose of retractably installing the tail rudder on the bottom surface of a boat, effectively avoids collision with the bottom of the boat during the taking-up process of the tail rudder and has a simpler and more reliable overall structure.

According to an aspect of the disclosure, a rudder apparatus for steering a watercraft includes a housing for being coupled to a stern of the watercraft. A blade casing is coupled to the housing. A blade is coupled to the blade casing. The blade casing is pivotally connected to the housing and pivotable with the blade between a deployed position in which the blade extends vertically downwardly into the water, and a stowed position in which the blade extends perpendicularly relative to the deployed position. The blade is pivotable relative to the blade casing from the deployed position to deflected positions to permit the blade to deflect when the blade impacts debris or the bed of the body of water.

A device for improving steering in a watercraft. The device has a frame attached to two parallel blades. The device pivotally attaches to an attachment point on a steerable nozzle of a watercraft. Frame of device has two curved mount brackets that are substantially parallel to one another having a first end and second end. A mount bracket connector connects the two mount brackets at the first end. The mount bracket connector includes a down force regulator, that folds back over mount bracket connector. Each mount bracket terminates at its second end with a lift tab. Lift tabs direct water flow in a generally downward and outward direction as watercraft moves through the water. Each mount bracket bolts to a blade, thereby holding the two blades securely parallel to one another.