Contribution to the aerodynamics of rotating-wing aircraft (1939)
NASA Technical Reports Server (NTRS) · leaf 38
l Memorandum Ho. 921 Figs. 1,2,3,4,5,6,7 Circumferential Normal "~-«^ direction Figure 2.- Velocities and angles at a section of the blade. Flight direction Figure 1.- Axial flow through normal plane. -32 a. Actual variation ksv ■» k8a cos a - k8n sin d b, Variation of substitute function kBh = k8a… … Direction of rotation of rotors A, Region of sound flow . B, Region of separated flow (idealized) 0,¥ 0,6 US ft fff C, Reversed-velocity region Figure 7.- Operating angle of blade Figure 6.- Mean angle of sideslip sections in rotor-swept- plotted against coef- disk area. ficient of advance.
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