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To achieve control surface flutter damping the balance mass must be located:
  • A
    behind the control surface hinge line.
  • B
    directly above the control surface hinge line.
  • C
    directly below the control surface hinge line.
  • D
    in front of the control surface hinge line.

Refer to the figure

The more forward the CG of a control surface, the more stable it will be. Therefore, most control surfaces are equipped with a Mass balance in front of the hinge line. (see figure)

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