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A horn balance achieves its effect by

  • A.Placing area ahead of the hinge line at the surface tip
  • B.Adding mass ahead of the hinge line
  • C.Sealing the gap between surface and fixed structure
  • D.Deflecting a small tab in the opposite direction

Answer: A

A horn balance is area forward of the hinge, concentrated at the tip, where it is easy to arrange without a full-span set-back. Unshielded and shielded variants differ in whether the horn projects beyond the fixed surface. Mass ahead of the hinge is mass balance, aimed at flutter. Sealing the gap is the internal balance arrangement. A tab moving the other way is a balance tab, which is a third and separate method.

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