推进器是由火箭发动机提供的，而不是螺旋桨和方向舵，这使得转向变得困难。
Propulsion is provided by a rocket engine, rather than a propeller and rudder, which makes steering difficult.
讨论了螺旋桨和舵、翼的推力解算方法和整个系统的动力学响应过程。
Thrust calculation of propeller, rudder, wing, and dynamic response of the whole system are discussed.
试验结果表明，桨、舵球间距的变化对螺旋桨敞水效率的影响是明显的。
The test results indicated that the variation of the spacing between propeller and rudder bulb has obvious effect on propeller open water efficiency.
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