## A note on the calculation of helicopter performance at high tip-speed ratios |

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angle of attack assumptions in regard azimuth position blade element blade-element angle blade-section CALCULATION OF HELICOPTER center of rotation Charts for Estimating charts of reference component of rotor compressibility effects Cp _ Cp Q cP,o curve labeled disk loading exact orientation existing rotor feathering Final iteration flight path force equilibrium force in longitudinal Gessow H-force helicopter performance high forward speeds HIGH TIP-SPEED RATIOS Initial Iteration K\CO Langley Field lb/sq ft level flight line of zero longitudinal displacement longitudinal plane NACA TN NASA onno orientation and magnitude parasite-drag area PERFORMANCE METHOD perpendicular to axis pitch angle plane of symmetry power coefficient power required published rotor radius resultant rotor force resultant-force vector rotor force vector rotor resultant force rotor theories rotor thrust coefficient rotor-shaft power shaft power sin(a small-angle assumptions stall and compressibility Tapscott tions velocity zero lift