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Engine types and their characteristics.

TypeBypass ratioSpecific thrustBest flight regime
Turbojet0HighHigh subsonic to supersonic
Low bypass turbofan0.3 to 1HighTransonic and supersonic
High bypass turbofan5 to 12LowHigh subsonic cruise
TurbopropVery high, effectivelyVery lowLow to moderate speed

What relationship does the table show between bypass ratio and specific thrust?

  • A.They move in opposite directions
  • B.They rise together
  • C.They are unrelated
  • D.Specific thrust is fixed by the flight regime alone

Answer: A

Accelerating more air more gently gives less thrust per kilogram of air but better propulsive efficiency. That is exactly why a high bypass engine must be physically much larger to produce the same total thrust as a turbojet would.

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