Mass Balance
When a control is deflected a low pressure area forms on the cambered side. This tends to pull the control back into alignment with the wing, stabilizer or fin as the case may be.
Mass Balance. A weight set forward of a control surface designed especially to prevent flutter.
That's how they built military fighters before the dawn of electronic flight controls. The XL2 reflects the definition of positive response, and the mass balanced elevator adds to the silky, feather-light control feel.
 See also: Control surface, Plane, Range, Structure, Speed
  
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