Paper considers effect upon direct operating cost of subsonic transport of increased propulsive efficiency achieved by raising fan ratio from 0 to 8; front and aft fan ratios up to five show progressive advantages in direct operating cost; when mounted as group of three, with center engine ingesting fuselage boundary layer, aft fan ratios up to seven 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 -- Paper
SAE Meeting ; 1965
1965
7 pages
Conference paper
English
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Higher Propulsive Efficiency in Subsonic Aircraft
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