A Note on the Calculation of Helicopter Performance at High Tip-speed Ratios |
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12 SQUARE FEET angle of attack assumptions in regard azimuth position becomes CT blade element blade-element angle blade-section CALCULATION OF HELICOPTER Charts for Estimating charts of reference component of rotor Cp,c CP,i Cp,o CP,P Cp,c CP,P Cp,p deg deg disk loading exact orientation existing rotor f values feathering Final iteration flight path force equilibrium force in longitudinal Gessow H-force helicopter performance high forward speeds HIGH TIP-SPEED RATIOS Initial iteration Langley Field lb/sq ft line of zero longitudinal displacement longitudinal plane NACA TN NASA orientation and magnitude parasite-drag area PERFORMANCE METHOD perpendicular to axis 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 W sin y zero lift