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Two engines produce the same thrust. One has a specific thrust of 500 newtons per kilogram per second and the other 150.

What can be concluded about their physical size?

  • A.The second must process far more air and be much larger
  • B.The second must be smaller and lighter
  • C.They must be the same size
  • D.Nothing can be concluded about size

Answer: A

Producing the same thrust from a third of the specific thrust means taking in more than three times the air. That is precisely why high bypass engines dominate the visual proportions of a modern airliner while a combat aircraft's engine is slender.

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