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A horn balance achieves its effect by

  • A.Placing area ahead of the hinge at the tip
  • B.Adding mass ahead of the hinge line
  • C.Fitting a tab at the trailing edge
  • D.Increasing the surface's chord

Answer: A

The horn projects forward of the hinge at the outboard end, so the airload acting on it opposes the hinge moment from the rest of the surface. It is simple and effective but adds a discontinuity that can affect the flow at high speed.

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