The theory of contra-vanes applied to the propeller (1939)
NASA Technical Reports Server (NTRS) · leaf 27
N.A.C.A. Technical Memorandum Ho. 909 fig*. 32,33,34,35,36,37,38,39 … Pig. 34 Fig. 37 Figure* 32-37.- Efficiency of contra-vanes with allowance for blade €. Fig. 38 Pig. 39 Figures 38-39.- Arrangement* on which the hub diameter between propeller and contra-vanes increase* or decreases*
NASA Technical Reports Server (NTRS)
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