Jet propulsion system, jet propulsion watercraft, and watercraft body launching method
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsYasuhiro OKADA, Yasuhiko HEMMI, Yukitaka OKAMOTO, Takuya MURAYAMA, Hirofumi AMMA, Junya MIWA
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Abstract
A jet propulsion system includes a jet propulsion mechanism located at a stern of a watercraft body and including a nozzle including a jetting port to eject a jet of water to generate a propulsive force, a nozzle actuator to rotate the nozzle to change an orientation of the jet of water, and a controller configured or programmed to perform an oscillation control to repeatedly oscillate the nozzle using the nozzle actuator when the watercraft body is launched.
Claims20
A jet propulsion system comprising:
- a jet propulsion mechanism located at a stern of a watercraft body and including a nozzle including a jetting port to eject a jet of water to generate a propulsive force;
- a nozzle actuator to rotate the nozzle to change an orientation of the jet of water;
- and
- a controller configured or programmed to perform an oscillation control to repeatedly oscillate the nozzle using the nozzle actuator when the watercraft body is launched.
A jet propulsion watercraft comprising:
- a watercraft body;
- a jet propulsion mechanism located at a stern of the watercraft body and including a nozzle including a jetting port to eject a jet of water to generate a propulsive force;
- a nozzle actuator to rotate the nozzle to change an orientation of the jet of water from the jetting port;
- and
- a controller configured or programmed to perform an oscillation control to repeatedly oscillate the nozzle using the nozzle actuator when the watercraft body is launched.
A watercraft body launching method comprising:
- generating a backward propulsive force using a jet of water from a jetting port of a nozzle of a jet propulsion mechanism when a watercraft body is launched from a trailer;
- and
- repeatedly oscillating the nozzle when the watercraft body is launched from the trailer.
Dependencies are inferred from the claim text.