Reverser for watercraft
AssigneeKawasaki Jukogyo Kaisha
InventorsYoshinori Tsumiyama, Kenichi Nakagawa, Tomohiro Kanazawa, Masafumi Ikeyama
Life of this patent
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Abstract
It is an object to provide a reverser for a watercraft which has a high go astern efficiency and also functions as a side thruster while holding planing performance. In a reverser (1) for a watercraft in which a deflector (1A) is movably provided behind a pump nozzle of a water jet pump (P) to change the direction of water flow ejected rearward from the pump nozzle, thereby allowing the body (A) to go in reverse, a discharge port (1a) which directs the water flow in a transverse direction is provided on both side portions of the deflector (1A), thereby feeding the water flow from the discharge port (1a) along a transom (T) of the body (A).
Claims14
A reverser for a watercraft having a transom and in which a deflector having two side portions is movably provided behind a pump nozzle of a water jet pump to change direction of the water flow ejected rearward from the pump nozzle, thereby moving the watercraft rearward said reverser comprising:
- a discharge port opening in a transverse direction provided on both side portions of the deflector and spaced rearwardly of said transom,
- wherein an inner face of the deflector includes a wall portion vertically extended in the center thereof and a deflecting curved face, curved in a lateral direction relative the watercraft, is provided on both sides of the wall portion for deflecting the water flow ejected rearward in a transverse direction thereby feeding the water flow from the discharge port along said transom of the watercraft.
A reverser for a watercraft having a transom and in which a deflector having two side portions is movably provided behind a pump nozzle of a water jet pump to change direction of the water flow ejected rearward from the pump nozzle, thereby moving a watercraft rearward, said reverser comprising:
- a discharge port opening in a transverse direction provided on both side portions of the deflector wherein each deflector discharge port is turned toward said transom at an angle of about 5 to about 30 degrees as seen in a plan view, thereby feeding the waterflow from the discharge port along said transom of the watercraft.
A reverser for a watercraft in which a deflector having two side portions is movably provided behind a pump nozzle of a water jet pump to chance direction of the water flow ejected rearward from the pump nozzle, thereby moving the watercraft rearward, said reverser comprising:
- a discharge port opening in a transverse direction provided on both side portions of the deflector, and
- wherein a lower end of the deflector has a partially circular shape as seen from the side and said discharge port is located in the middle portions of both side portions of the deflector only in the lower ends thereof, thereby feeding a water flow from the discharge port along a transom of the body of the watercraft.
A method of reversing a watercraft comprising:
- reducing the pressure of water behind the watercraft relative the water pressure of water on other portions of the watercraft to thereby move the watercraft rearward.
A method of reversing a watercraft having a deflector movably provided behind a pump nozzle of a water jet pump to change direction of the water flow ejected rearward from the pump nozzle to move the watercraft in a rearward direction comprising:
- deflecting most of the water ejected from said pump nozzle in lateral directions adjacent a transom at the rear end of said watercraft.
Dependencies are inferred from the claim text.