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The Breda Wind Tunnel (1939)
NASA Technical Reports Server (NTRS) · leaf 13
N.A.CA. Technical Memorandum No. 928 Figs.10,13 Figure 13.- Propeller as8embly(2 propellers with contra-vane).NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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