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Which effect makes the derivatives of a large transport differ between a rigid model and the real aeroplane at high dynamic pressure?

  • A.The difference in Reynolds number alone
  • B.The presence of the landing gear
  • C.Aeroelastic deformation of the lifting surfaces
  • D.The change in air density with altitude

Answer: C

Aeroelastic deformation is the effect in question: under load the wing and tail twist in a direction that reduces the incidence change they achieve, so the real derivatives are softer than the rigid ones and the shortfall grows with dynamic pressure. Density is already accounted for by the dynamic pressure in the conversion. Reynolds number matters, especially near the stall, but it is a separate correction. Landing gear is a configuration change rather than a rigid-to-flexible one.

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