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Which best explains why aerofoil sections are closed wherever possible?

  • A.A closed section needs no ribs
  • B.A circulating flow is far more efficient
  • C.A closed section is lighter than an open one
  • D.A closed section carries no bending stress

Answer: B

The torsional stiffness gained is two or three orders of magnitude for a few per cent of added weight, and wing torsional stiffness governs both aeroelastic divergence and control reversal. Closing the section is among the cheapest structural decisions available.

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