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Differential aileron rigging means that

  • A.Only one aileron moves at a time
  • B.The ailerons droop symmetrically with flap to increase the wing camber
  • C.The up-going aileron deflects further than the down-going one
  • D.Both ailerons deflect by the same amount

Answer: C

Differential rigging gives the up-going aileron more travel than the down-going one, which raises the drag on the up-going wing and reduces adverse yaw, on the same principle as the Frise shape but achieved through the linkage. Equal deflection is the plain arrangement it improves upon. Only one moving at a time is not a rigging scheme. Symmetric droop with flap is flaperon behaviour, a different function altogether.

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