Discussion
A design team must choose an engine for a 200 seat aircraft cruising at Mach 0.82 over intercontinental ranges, with strict airport noise limits to meet.
Which type should they select and why?
Answer: B
At that cruise Mach number the high bypass turbofan has by far the best propulsive efficiency and the lowest jet noise. A turbojet would burn far more fuel, a turboprop cannot reach the speed, and a ramjet produces no thrust at rest at all.
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