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Ram drag is

  • A.The drag caused by spillage around the intake
  • B.The momentum of the incoming air
  • C.The drag of the nacelle in the airstream
  • D.The loss of total pressure in the intake

Answer: B

The engine must accelerate air that already had momentum in the flight direction, and only the increase counts as thrust. Ram drag grows with flight speed, which is a large part of why net thrust falls as an aircraft accelerates.

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