Figs. 1, .C.A. Technical Memorandum Ho. 729 Forward setting of blade Perpendicular to rotor shaft --Backward setting "f- of "blade Perpendicular to mean--, Mean plane of rotation plane of rotation of "blades v/hen g6 is small of "blades Perpendicular to flight speed Eotor .shaft Fiffore 1 … Figure 2
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