| 摘要 |
PROBLEM TO BE SOLVED: To ensure an amount of jet water stream and improve the steering property of a jet propulsion boat by introducing a controller capable of increasing the revolution of an engine up to the revolution determined in advance irrespective of throttle and maintaining the revolution over the predetermined time. SOLUTION: This jet propulsion boat is provided with the controller 74 capable of increasing the revolution of the engine up to the predetermined revolution (maintenance revolution N2) irrespective of the throttle 64 and maintaining the revolution over the predetermined time T2 when the throttle 64 is closed and a steering 28 is steered to the left or right more than the predetermined angle on the basis of the conditions that the engine 15 rotates by predetermined number of revolutions N1 or more for predetermined time T1 or more and the throttle 64 is opened by a predetermined degree of openingθ1 or more for the predetermined time T1 or more.
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