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Aerodynamic balance of a control surface is used to

  • A.Increase the surface's maximum deflection
  • B.Improve the surface's lift curve slope
  • C.Prevent the surface from floating
  • D.Reduce the hinge moment and therefore the pilot's effort

Answer: D

Moving part of the surface area ahead of the hinge line lets the airload help rather than oppose the pilot. Overbalancing must be avoided, since a surface that assists too much produces control forces that reverse and becomes unsafe.

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