Since propeller efficiency becomes less as tip speed approaches sonic velocity and, to increasing extent as flying speed is higher, it is customary to keep tip speed from exceeding 0.85 and 0.95 times sound velocity; formulas given for induced efficiency. (See also Luftfahrtforschung v 15 n 7 July 6 1938 p 334-9; and English translation in Nat Advisory Committee Aeronautics -- Tech Memo n 884 Jan 1939 p 39-51, 3 supp plates)
Prospects of propeller drive for high flying speeds
Die Aussichten des Luftschaubenantriebes fuer hohe Fluggeschwindigkeiten
1938
Bibliography
Aufsatz (Zeitschrift)
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