1.什么是螺旋螺旋是一种非正常的飞行状态,它的特点是迎角大、旋转半径小、旋转角速度快和下沉速度快。完整的螺旋运动有三个阶段组成,即初始阶段、深发展阶段,和改出螺旋阶段。1.1初始阶段初始阶段发生在机翼不对称失速或者是由于一个机翼比另一个机翼失速更严重而飞机开始滚转。此时的自转力不断增大。机头下俯,螺旋轴还没有完全 1. What is a spiral spiral is an abnormal state of flight, which is characterized by large angle of attack, a small radius of rotation, the rotation speed and sinking fast. The complete helical movement consists of three phases, the initial phase, the deep development phase, and the spiral phase change. 1.1 The Initial Phase The initial phase of asymmetric stall occurs in the wing or because one wing stalls more severely than the other wing and the aircraft begins to roll. Rotational force at this time increasing. Head down, the screw shaft is not fully