Helicopters require a tail rotor to counteract the rotor torque; this and the articulated head complicate flying, construction and maintenance enormously.
需要直升机尾桨抵消转子力矩;这和阐述头复杂飞行,建造和维修极大。
Helicopters require a tail rotor to counteract the rotor torque; this and the articulated head complicate flying, construction and maintenance enormously.
需要直升机尾桨抵消转子力矩;这和阐述头复杂飞行,建造和维修极大。
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