Higher Propulsive Efficiency in Subsonic Aircraft 650839

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.


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