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A ramjet can accelerate an aircraft from rest. True or false?

  • A.True, at low altitude only
  • B.False, only because of combustion instability
  • C.False, it relies entirely on ram compression
  • D.True, given sufficient fuel flow

Answer: C

With no compressor there is nothing to raise the pressure when the aircraft is stationary, so the engine produces no thrust whatever. It must be boosted to operating speed by a rocket or another engine before it can take over.

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