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This asymmetry means a wing's upper and lower surfaces are usually

  • A.Both sized by static tension
  • B.Both sized by buckling
  • C.Designed to different allowables
  • D.Identical in every respect

Answer: C

The upper surface is stability-critical and the lower fatigue-critical, so different alloys and different thickness distributions are common. Alloys with high compression strength go on top and damage-tolerant ones underneath.

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