Discussion
Arrange these engine types in order of increasing bypass ratio:
1. Turbojet, with no bypass at all
2. Low bypass turbofan on a combat aircraft
3. High bypass turbofan on a transport
4. Turboprop, treating the propeller as a very large fan
Select the correct sequence.
Answer: A
The progression is one of accelerating steadily more air by steadily less, which raises propulsive efficiency throughout. Treating a propeller as the limiting case of a fan makes the whole family one continuous idea rather than four separate ones.
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