What is the vertical movement of a rotor blade about a flapping hinge called?

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Multiple Choice

What is the vertical movement of a rotor blade about a flapping hinge called?

Explanation:
Flapping is the vertical movement of a rotor blade about a flapping hinge. This hinge lets each blade move up and down as lift acts on it, helping balance lift across the rotor disk and absorb gusts so the rotor system stays smooth and the rotor speed remains steadier. This motion is distinct from changing the blade’s angle of attack (that’s pitch, adjusted by collective and cyclic controls), twisting along the blade’s length (torsion), or rotating the helicopter about its vertical axis (yaw). So the upward and downward motion about the flapping hinge is flapping.

Flapping is the vertical movement of a rotor blade about a flapping hinge. This hinge lets each blade move up and down as lift acts on it, helping balance lift across the rotor disk and absorb gusts so the rotor system stays smooth and the rotor speed remains steadier. This motion is distinct from changing the blade’s angle of attack (that’s pitch, adjusted by collective and cyclic controls), twisting along the blade’s length (torsion), or rotating the helicopter about its vertical axis (yaw). So the upward and downward motion about the flapping hinge is flapping.

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