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Which statement below, regarding the Flapping movement, is correct?

  • A

    It is the angular movement of the blade above or below the horizontal plane.

  • B

    It is controlled in the tail rotor by moving the yaw pedals.

  • C

    It is the angular movement of the blade relative to the hub plane.

  • D

    It is corrected by causing the disc to tilt to the left when collective lever is raised.

Refer to figure.
Flapping is the vertical movement of the blade above or below the hub plane.

Flapping will occur following collective and cyclic blade pitch changes, rotor RPM changes, and as a result of changes in the speed and direction of the relative airflow.

Flapping will also occur if the CG of the helicopter is such that the shaft axis and the axis of rotation do not coincide.

The flapping axis is an imaginary line that runs perpendicular to the plane of rotation of the helicopter rotor blades. It represents the axis around which the rotor blades flap up and down as they rotate around the hub.

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