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Calculation of the induced efficiency of heavily loaded propellers having infinite number of blades (1939)
NASA Technical Reports Server (NTRS) · leaf 59
N.A.C.A. Technical Memorandum No. 884 Figs.80,21,28,85,26,27 Figure 27. Figure 26.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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