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Spillage drag arises when

  • A.The boundary layer is diverted
  • B.The nozzle is over-expanded
  • C.The intake captures less air than the streamtube approaching it
  • D.The intake captures more air than the engine can use

Answer: C

Air that approaches the intake but flows around it must be turned, and the pressure forces of that turning appear as drag on the airframe. It is worst when the engine is throttled back at high speed, since the demand falls while the capture area stays fixed.

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