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Torsional divergence of a wing occurs when

  • A.The aileron is deflected fully
  • B.The twisting moment outgrows the structure
  • C.The wing stalls at its root
  • D.The wing's bending stiffness falls to zero

Answer: B

Above the divergence speed a small twist raises the incidence, which raises the lift, which twists the wing further, with no equilibrium available. It is a static aeroelastic instability and it is avoided by keeping the torsion box stiff and the aerodynamic centre near the flexural axis.

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