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Tandem Air Propellers (1939)
NASA Technical Reports Server (NTRS) · leaf 25
N.A.C.A. Fig. 10 .40 … 0 .4- .6 1.2 1.6 2.0 2A 28 3.2 3.6 Figure 10.- Working cnart. 4-blade right-band propeller.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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