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The plane of rotation is tilted when the pilot…
  • A
    Applies the cyclic control.
  • B
    Allows the blades freedom to flap.
  • C
    Raises and lowers the collective lever.
  • D
    Moves the yaw pedals.

Refer to figure.
The tip path plane is the plane traced out by the blades tips. This plane is also known as the no-flapping plane or rotor disc plane. The tip path plane is parallel to the plane of rotation and perpendicular to the axis of rotation.

The plane of rotation, also known as the Hub Plane of Rotation is parallel to the tip path plane, but runs through the centre of the hub and is tilted each time the pilot applies the cyclic control. The Hub Plane (fixed reference between the hub and the shaft) is not the same as the hub plane of rotation.

The axis of rotation is the axis about which the rotor rotates, it is perpendicular to the plane of rotation and runs through the centre of the hub.

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