Improved engine and aircraft performance has been achieved in the latest generation of aircraft engines, the fanjets, by the application of the by-pass principle, owing to its superior propulsive efficiency as compared to its basic counterpart — the turbojet. This paper demonstrates that in the moderate subsonic flight regime, interesting performance gains are obtainable by using by-pass ratios appreciably larger than in today’s fanjet engines. Considerations for the selection of an optimum by-pass ratio and design approaches to the high by-pass fan are discussed.
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