执行后退侧滚时，请控制主旋翼的螺距，以便维持固定的高度及速度。
Use collective control to maintain constant altitude and speed. Fly away from the maneuver straight and level.
利用轮齿接触分析与齿轮啮合原理，建立了齿面均匀研磨与定点研磨控制的几何运动模型，经滚检检验，该模型能对齿面研磨位置与侧隙进行较准确的控制。
The rolling tests prove that this setup model can control precisely the displacement of the lapped area in the tooth surface and keep the even backlash.
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