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The rotor in hover
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actuator disc advance ratio aerodynamic aerofoil aerofoil section aircraft analysis autorotation axis azimuth behaviour blade element theory blade flapping blade pitch blade section blade tip calculation cause Chapter coefficient collective pitch component cyclic pitch damping descent direction disc tilt downwash duct dynamic effect engine flapping equation flapping frequency flapping hinge flapping motion forward speed fuel consumption fuselage gives ground resonance helicopter rotor hence hinge offset hover increase induced power induced velocity lift lift force loading main rotors tilt mass mission mode momentum theory normal pilot pitch angle Plate profile power rearward rotor control rotor disc rotor head rotor hub rotor power rotor radius rotor rotation rotor shaft rotor speed rotor torque sail shown in Fig stall static droop streamtube tail boom tail rotor blade tail rotor thrust term torque trim variation vertical vibration vortex vortex ring weight Westland Westland Lynx Westland Sea King zero