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advancing blade aerodynamic drag amplitudes angular velocity antivibrator application arms blade motion C. G. to hinge calculation center of gravity center of rotation centrifugal forces coefficient of elasticity damped motion danger of instability descending vertical flight Dissipation of energy distance of stabilizer Djinn dynamic absorber elastic deformation elastic suspension energy due equation corresponds equation of motion equilibrium exciting force fair the lines Feingold Figures 3(a fixed system forward flight fuselage Geometric symbols Hinged Blades HORIZONTAL ABSORBER horizontal flapping horizontal plane jet helicopter kinetic energy Lagrange equations landing gear concentrated Langley Field Laufer leaf springs Let us note machine Mechanical Oscillations NACA NASA natural frequency Oscillations of Rotors packs of leaf pendulum position potential energy Proper Values pylon retreating blade rotating system rotor rpm Science Aeronautiques shows the schematic small masses speed stabilizer mass system of equations Technique et Science Theory of Mechanical tip mass TWO-BLADED HELICOPTERS undercarriage vertical vibrations