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Which statement about the drag crisis is INCORRECT?

  • A.It causes the skin-friction drag to fall
  • B.It causes the total drag coefficient to fall sharply
  • C.It is triggered by transition to turbulence
  • D.It can be brought on deliberately by roughening the surface

Answer: A

Skin friction rises through the crisis. What collapses is the pressure drag, because the separation point moves aft and the wake narrows, and for a bluff body that term is so much larger that the total still falls sharply.

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