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*Jet* is a generic, informal term for an aircraft with jet propulsion. In a civilian context it may refer to an airliner or small private jet.

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How do tubojets compare to afterburning turbofans in terms of efficiency?

Turbojets used to be more common in the 40's and 50's but once jet engine design matured they pretty much went extinct in favor of the more efficient turbofan. … So both jets have similar high speed performance, which jet should we expect to be more fuel efficient, the turbojet at max thrust, or the turbo fan with afterburner on, at max thrust? …
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I'm having a hard time conceptualizing this statement from "The Jet Engine" by Rolls-Royce

This is taken from section 21 of Chapter 3, Compressors that discusses axial flow compressors in turbine jet engines. … https://www.wiley.com/en-it/The+Jet+Engine%2C+5th+Edition-p-9781119065999 (also here) …
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