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Aerodynamic airfoil American Helicopter Society AMI code analytical angle of attack apparent mass blade element theory blade flapping motion blade span blade tip blade under consideration coefficient input mode collective pitch input correlation cyclic pitch distorted wake model downwash elliptical wing equation 20 equation 37 equation 56 extended Local Momentum fixed wing following blade forward flight given by equation Helicopter Rotor hovering rotor induced velocity distribution Kawachi Kocurek and Tangular Momentum Theory NACA TN nondimensional number of blade pitch input mode preceding blade prescribed wake vortex present theory recurrence equation results obtained rotary wing rotor blade rotor rotational plane semi-infinite vortex cylinder shown in Fig spanwise lift distributions spanwise partitions station Substituting equation Tangular wake model theoretical THEORY LANDGREBE WAKE thrust coefficient input time-wise variation tip path plane tip vortex tip vortices uniform attenuation coefficient upwash region UTRC code vortex ring wake deformation wake vortex theory wing span