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; Deutsche Luftfahrtforschung -- Jahrbuch 1938 p I-365-70)
Prospects of propeller drive for high flying speeds
Die Aussichten des Luftschaubenantriebes fuer hohe Fluggeschwindigkeiten
1939
13 pages
3 Supp plates, Bibliography
Report
Englisch
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