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The Development of RotatingWing Aircraft
An Introduction to the Helicopter
An Introduction to Hovering Theory
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aerodynamic aircraft airfoil section airplane angle of attack angle-of-attack angular velocity Appendix IIA autogyro autorotation azimuth blade element blade motion blade pitch blade stall blade twist calculated center of gravity characteristics charts chord climb component constant control axis curve damping in pitch drag coefficient drag-lift ratio effect equation expression figure of merit flapping hinges flapping motion flight conditions forces forward flight forward speed frequency fuselage given harmonic Helicopter Rotor ideally twisted in-plane inasmuch increase induced velocity inflow lift coefficient lift force longitudinal machine momentum theory NACA TN nondimensional nose-up operating oscillation parasite drag perpendicular pitch angle pitching moments position power required produced profile-drag losses profile-drag power radial rate of descent retreating blade rotation rotor blades rotor speed rotor thrust shown in Fig solidity static stability stick tail rotor taper theory thrust coefficient thrust vector tilt tip speed tip-path plane tip-speed ratio torque values variation vertical vibration zero