Patent ID: 6589085
Filing Date: 2003-07-08
Classification: B63B,B63H,F02D

Abstract:
A jet-propulsion watercraft comprising:a water jet pump including an outlet port and a steering nozzle, said water jet pump pressurizing and accelerating sucked water and ejecting the water from the outlet port to propel the watercraft as a reaction of the ejecting water; an engine for driving the water jet pump; a steering operation means operating in association with the steering nozzle of the water jet pump; a steering position sensor for detecting a predetermined steering position of the steering operation means; a throttle-close operation sensor for detecting a throttle-close operation; a cruising speed obtaining means for obtaining a cruising speed of the watercraft; and an electric control unit, wherein the electric control unit is adapted to increase an engine speed of the engine to a predetermined engine speed during the detection of the predetermined steering position by the steering position sensor and the detection of the throttle-close operation by the throttle-close operation sensor while changing an increasing speed of the engine speed according to the cruising speed obtained by the cruising speed obtaining means, and wherein the electric control unit is adapted to set correspondingly lower increasing speeds of the engine speed for higher obtained cruising speeds.