Flap Back

Question 1

What is Flap Back?

Answer 1

Cyclic pitch applied to tilt rotor disc down over nose to move forward.

As forward speed in increases, advancing & retreating blades experience a dissymmetry of lift.

Advancing blade flaps up, retreating down, flapping to equality occurs and nose tilts up.

Question 2

How is flap back overcome?

Answer 2

Moving the cyclic pitch stick further forward to bring rotor disc back into the correct position.