## A Momentum Analysis of Helicopters and Autogyros in Inclined Descent, with Comments on Operational Restrictions |

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Aircraft angle of attack appendix AUTOGYROS autorotating rotor climb collective pitch comparison data bands descending flight descent rate equal to zero equation 11 equation 25a equation 45 equation 57 experimental data Figure 12 finite wing flight measurements flightpath forward flight forward speed full autorotation gain of potential glide slope Harry H Helicopter Rotor Heyson horizontal hovering ideal autorotation inclined descent increase indicates induced power induced velocity induced-velocity ratio Langley Research Center mass flow maximum lift coefficient minimum speed momentum theory NACA NASA NASA TN negative nondimensionalized normal obtained operational restrictions pilot potential energy Ps/Ph rate of descent rate of gain required shaft power resultant velocity rotor in vertical rotor inclination side of equation solve equation substitute equation thrust tip-path plane tip-path-plane inclination vector vertical descent vertical flight vertical force vertical-drag coefficient VG,min vortex rings Vq/w wake skew angle windmill-brake wq/w yield