Yamaha Hatsudoki Kabushiki Kaisha

Yoshinori Yagi

Akihiro Tagata

Susumu Shibayama

Nobuharu Ota

Hirotaka Tamoto

A marine propulsion system includes a propulsion device, an up-and-down movement sensor, and a controller configured or programmed to control driving of the propulsion device and perform a wave control including an attitude control to reduce an up-and-down attitude change of a hull by temporarily reducing a vessel speed based on a measurement result of the up-and-down movement sensor each time a marine vessel rides over a wave. The controller is configured or programmed to, in the wave control, perform the attitude control when it is determined that a wave condition is a head wave, and not perform the attitude control when it is determined that the wave condition is a following wave.

Marine propulsion system and marine vessel

A marine propulsion system includes a controller configured or programmed to temporarily cancel an in-wave vessel speed control mode, in which an in-wave vessel speed control is performed to adjust a vessel speed based on information regarding upward-downward movement of a hull when waves are occurring, for a predetermined period of time when an operator is operated to cancel the in-wave vessel speed control mode.

A jet propulsion watercraft includes a vessel body, a jet pump that is disposed at the vessel body and that includes a water jet opening, and a first guide that is attached to the vessel body. The jet pump generates a thrust by sucking in water existing around the vessel body and jetting the water from the water jet opening. The first guide receives water flowing on a lateral side of the vessel body and generates a downforce that generates a wake behind the vessel body.

Growing community of inventors

Shizuoka, Japan

Yoshinori Yagi