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Experimental apparatus for the study of propellers (1937)
NASA Technical Reports Server (NTRS) · leaf 13
N.A.C.A. Technical Memorandum No. 819 Figs.6,7,8,9 … Figure 8. Figure 9.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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