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Thrust from an air breathing engine falls with altitude principally because

  • A.The fuel burns more slowly
  • B.The compressor cannot rotate as fast
  • C.The nozzle expands less
  • D.Air density falls, cutting mass flow

Answer: D

Thrust is proportional to mass flow, and mass flow follows density almost directly. Falling temperature partly offsets this by improving the cycle, which is why the thrust lapse is less severe than the density ratio alone would predict.

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