| 摘要 |
<p>A water jet propulsion system of which the vertical position of jet is variable with a variation in the draft of the craft. A plurality of water jet nozzles (2, 3, 4) either differing from one another or adjustable in jet diameter are spaced vertically, and either valves (6, 7, 8) provided in water passages leading to the jet nozzles are independently controlled or the water jet nozzles (50, 60) whose jet diameters are adjustable are driven vertically. <IMAGE></p> |
