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
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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