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Inlet and engine must be matched because

  • A.They are manufactured by the same company
  • B.The intake sets the fuel flow
  • C.The engine determines the aircraft's speed
  • D.Demand must equal supply

Answer: D

A mismatch appears as spillage drag if the intake supplies too much or as poor recovery and instability if it supplies too little. Matching must hold across the whole flight envelope, which is precisely why variable geometry appears on high speed aircraft.

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