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Maximising propulsive efficiency is always the right design objective. Is this correct?

  • A.No, it reaches unity only when the thrust is zero
  • B.Yes, efficiency is always paramount
  • C.Yes, provided thermal efficiency is fixed
  • D.No, because it cannot be measured

Answer: A

Propulsive efficiency approaches one as jet velocity approaches flight velocity, at which point the velocity increment and the thrust both vanish. A practical cycle therefore accepts some loss deliberately in exchange for thrust the aircraft can use.

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