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Which statement about control surface balance is TRUE?

  • A.Aerodynamic balance eases hinge moment; mass balance guards flutter
  • B.Both forms of balance exist only to reduce hinge moment
  • C.Both forms exist only to guard against flutter
  • D.Neither affects the flutter speed

Answer: A

The two are distinct. Placing area ahead of the hinge reduces the effort the pilot or actuator must supply, while placing mass ahead of it moves the centre of gravity forward and decouples rotation from bending. Only the second bears on flutter.

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