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The theory of contra-vanes applied to the propeller (1939)
NASA Technical Reports Server (NTRS) · leaf 26
/ 1 Figs. 26,27,28,29,30,31 N.A.C.A. Technical Memorandum No. 909 … Figure 26 Figure 29 o- a Figure 28 ' Figure 31 Figures 26-31.- Efficiency of contra-vanes with allowance for blade e.NASA Technical Reports Server (NTRS)
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