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A wing aerodynamic centre lies at 0.25 chord and the centre of gravity at 0.32. The wing's own contribution to the moment slope is

  • A.Plus 0.07, destabilising
  • B.Minus 0.07, stabilising
  • C.Plus 0.57, destabilising
  • D.Zero

Answer: A

The contribution is the centre of gravity position less the aerodynamic centre position, \( 0.32 - 0.25 = 0.07 \), and a positive value is destabilising. Only the tailplane's negative contribution can then make the whole aeroplane stable.

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