它使用一个安装在后面的推进式螺旋桨并有一对一上一下反向旋转的主旋翼。
The X2 uses a pusher propeller mounted at the rear and has a pair of contra-rotating main rotors, one positioned above the other.
然后着重分析吊舱式电力推进系统的两个重要组成部分：螺旋桨和推进电机。
Secondly this dissertation analyses two important parts-the screw propeller and the propulsion motor.
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