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Which of these would NOT delay the onset of drag divergence on a wing?

  • A.Sweeping the wing back
  • B.Using a supercritical aerofoil section
  • C.Reducing the thickness-to-chord ratio of the sections
  • D.Increasing the thickness-to-chord ratio of the sections

Answer: D

A thicker section accelerates the flow over it more strongly, so it reaches sonic conditions at a lower free-stream Mach number and drag divergence arrives earlier. Thinning the section, sweeping the wing and adopting a supercritical shape all push the onset the other way.

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