AILERON, a hinged moveable part on the trailing edge of each wing for airplane roll (wing up and wing down) control.
副翼，铰连在每个机翼后缘的可动部件，用于控制飞机的滚转(机翼向上和向下)。
2
With the helicopter moving backwards at medium pace, the helicopter will be aileron-rolled twice, each roll being clearly delineated by 4 hesitation points.