竹圍國小林家僪10/9作業

The main rotor lift just by the gravity with the same body, and so they would not fall down, the tail rotor can be offset by other main rotor torsion torque generated, so they will not have rotation.

主旋翼產生的昇力恰好與機體受到的重力相等，所以就不會掉下來，另外尾旋翼可以抵銷主旋翼產生的扭力矩，所以不會一直旋轉。

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引用 http://tw.knowledge.yahoo.com/question/?qid=1205080201625

Brief Rotary-wing aircraft Introduction
參考資料 旋翼機概論