Discussion
Assertion (A): Wind tunnel derivatives from a rigid model understate the pitch stiffness of a large flexible transport at high dynamic pressure.
Reason (R): Aeroelastic deformation of the wing and tail reduces their effective contribution to the restoring moment.
Select the correct answer from the options below.
Answer: C
Both are true and the second explains the first. A flexible aeroplane's surfaces twist under load in a direction that reduces the incidence change they actually achieve, so the real stiffness is lower than a rigid model measures, and the shortfall grows with dynamic pressure. Flexible-to-rigid correction factors are applied for exactly this reason, and the corrections are among the harder parts of a derivative set to get right before first flight.
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