A blade-element analysis for lifting rotors that is applicable for large inflow and blade angles and any reasonable blade geometry

Walter Castles, Jr., Noah C. New
naca-tn-2656
Jul 1952


Simple approximate solutions are derived for the relationships between the rotor thrust and flight-path velocity components and the rotor blade angle, torque, and in-plane forces. These approximate solutions, based upon the assumption of a triangular distribution of blade circulation and a parabolic variation of blade-element profile drag with lift, are sufficiently accurate for preliminary calculations and the determination of the equilibrium angle of attack and lateral tilt of the tip-path plane.

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