Windmilling is experienced when the rpm is reduced but the airspeed is maintained, which eventually will cause the blade angle of attack to become negative. When this occurs, the resulting force will act in a rearward direction. This is known as windmilling.
A windmilling propeller causes a drag force, which is opposite yo the direction of flight. This drag can be quite high, and in addition to its deceleration effect, it also can cause a large yawing moment on a multiengined aircraft with asymmetric thrust.
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