The effect of varying fan ratios from 0–8 is examined, with particular reference to high subsonic transports. Front and aft fan ratios up to 5 show progressive advantages indirect operating cost. When mounted as a group of three, with the center engine ingesting fuselage boundary layer, aft fan ratios up to 7 are worth while, and these values will rise as lower sizes, weights, and drags result from engineering developments, such as fan-turbine units optimized to suit particular aeroplanes and variable pitch fans incorporating thrust reversal.
Higher Propulsive Efficiency in Subsonic Aircraft
Sae Technical Papers
Aeronautic and Space Engineering and Manufacturing Meeting ; 1965
1965-02-01
Conference paper
English
Higher propulsive efficiency in subsonic aircraft
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