MacDonald, Alexander Forsyth, 1897-1965 · Port Credit, Ont. : Aviation Service Corporation · leaf 131
Fig. 30, Turboprop Engine. THE BY-PASS ENGINE The propeller generates thrust by accelerating alarge mass of air to a relatively low velocity. The jetaccelerates a relatively small air mass to a very highvelocity. For low aircraft speeds the propeller is mostefficient. For high aircraft speeds, the… … Aero Engines 127 is because the jet engine produces its greatest propul-sive efficiency at high aircraft speeds. At low aircraftspeeds, its thrust efficiency falls off and its fuel con-sumption becomes excessive. The Rolls-Royce ConwayBy-pass is designed to improve the efficiency of thejet engine…
Airplanes
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