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The single most important structural reason a wing box is kept closed along its span is that

  • A.A closed box carries no bending stress
  • B.A closed box needs no ribs
  • C.A closed cell carries torque far better
  • D.A closed box is lighter than an open one of the same size

Answer: C

The Bredt-Batho mechanism outperforms St Venant torsion by two or three orders of magnitude, and wing torsional stiffness sets the divergence and reversal speeds as well as the stress. Everything about the box's layout follows from protecting that closed cell.

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