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A propeller mounted ahead of the centre of gravity is

  • A.Stabilising in yaw
  • B.Neutral in yaw
  • C.Destabilising only at low power
  • D.Destabilising, its side force acting forward

Answer: D

The disc develops a side force when the flow meets it at an angle, and forward of the centre of gravity that force yaws the nose further from the wind. A pusher propeller behind the centre of gravity is stabilising for the same reason reversed.

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