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Which best summarises why torsion is treated so carefully in airframe design?

  • A.Torsion is the largest stress in every airframe member
  • B.Torsion determines the aircraft's weight
  • C.Torsion affects only the undercarriage
  • D.It governs aeroelastic behaviour too

Answer: D

Divergence and control reversal both depend on how readily the wing twists, so torsional rigidity is an aeroelastic requirement in addition to a strength one. That double role is why the closed torsion box is defended so firmly against cut-outs and thinning.

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