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Yaw

The angle of the aircraft's heading relative to the vertical axis and generally controlled by the pilot using the rudder and in which stability is provided by the fixed or nonmovable fin. Movement of an aircraft about its vertical axis, representing movement of its tail unit to port or starboard, to change the aircraft's heading. The rotational movement of an aircraft about its vertical axis, controlled by the rudder or the rotation of the model around the main rotor shaft, i.e.: tail rotor inputs.

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Yawning

Involuntary opening of the mouth with respiration, breathing first inward, then outward. Yawning is often caused by the power of suggestion. Repeated yawning may be a sign of drowsiness. It can also sometimes be a sign of depression.

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