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A wake survey determines a body's drag by measuring

  • A.The surface temperature of the body
  • B.The free-stream turbulence level
  • C.The momentum deficit downstream of the body
  • D.The pressure at the stagnation point

Answer: C

Integrating the momentum lost across a plane behind the body gives the drag directly, by momentum conservation, without needing to instrument the surface at all. It is particularly useful for sections in a wind tunnel and is the standard way section drag data are obtained.

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