ANGLE OF INCIDENCE, The acute angle which the wing chord makes with the longitudinal axis of the aircraft.
安装角， 飞机的纵轴与机翼弦线所形成的锐角。
Roll axis - Longitudinal axis, passes through the airplane from front to rear - wing up and wing down control is by ailerons and flight spoilers.
横滚轴—又称纵轴。由飞机的前部通向后部。机翼下运动由副翼和飞行扰流板控制。
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