Rotor blade flapping action is
A
an undesirable reaction to changes in airspeed and blade angle of attack.
B
an aerodynamic reaction to high speed flight and cannot be controlled by the pilot.
C
a design feature permitting continual changes in the rotor blade angle of attack, compensating for dissymmetry of lift.✓ Correct Answer
Explanation
The Helicopter Flying Handbook explains that blade flapping is a designed feature: the advancing blade flaps up (reducing its angle of attack) and the retreating blade flaps down (increasing it), which compensates for dissymmetry of lift. It is not an undesirable reaction.
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