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The critical Mach number of a wing is raised by all of the following design choices, the most direct being to

  • A.Reduce the thickness-to-chord ratio
  • B.Increase the wing area
  • C.Increase the taper ratio
  • D.Add winglets

Answer: A

Thickness sets how much the flow must accelerate over the section, so thinning it is the most direct way of delaying sonic conditions. Sweep and a supercritical shape both help as well, but neither changes the fundamental relationship between thickness and local overspeed the way thinning does.

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