The thrust and the torque of the contra-rotating propeller has been calculated by this method, and its result is satisfying on the comparison and the analysis with the actual value.

通过该方法计算了对转螺旋桨的推力和转矩，并与实验值进行了比较和分析，其结果令人满意。

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The X2 uses a pusher propeller mounted at the rear and has a pair of contra-rotating main rotors, one positioned above the other.

ECONOMIST: Chop, chop