Helicopter Performance, Stability, and Control

a₁ aerodynamic aircraft airfoil analysis angle of attack autorotation B₁ blade element calculated Chapter charts chord climb collective pitch Colo CT/O curve cyclic pitch damping derivatives disc loading drag coefficient dynamic pressure engine example helicopter Figure of Merit flight conditions forward flight forward speed ft/sec ft² function fuselage gross weight ground effect H-force Helicopter Rotor hinge offset horizontal stabilizer ideal twist increase induced velocity knots lb/ft/sec level flight lift coefficient Mach number main rotor maneuver maximum lift coefficient method Mtip NACA nondimensional oscillation parameters pilot pitching moment power required radius rate of descent reported in reference retreating blade Reynolds number rotation rotor thrust shaft shown in Figure sideslip stall tail rotor takeoff tilt tip path plane tip speed ratio torque trim conditions V₁ vortex wake wind tunnel wind tunnel tests wing zero ΟΥ ΩΡ дв ді др ду дх