Dual higher harmonic control (HHC) for a counter-rotating, coaxial rotor system
a rotor system and coaxial technology, applied in the field of rotary wings, can solve the problems of increasing maintenance and operating costs, contributing to crew fatigue, periodic aerodynamic load on the rotor blades, etc., and achieve the effect of reducing or theoretically eliminating airframe vibration
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[0018]FIG. 1 illustrates an exemplary vertical takeoff and landing (VTOL) rotary-wing aircraft 10 having a dual, counter-rotating, coaxial rotor system 12 which rotates about a rotating main rotor shaft 14U, and a counter-rotating main rotor shaft 14L (FIG. 2) both about an axis of rotation A. The aircraft 10 includes an airframe F which supports the dual, counter rotating, coaxial rotor system 12 as well as an optional translational thrust system T which provides translational thrust during high speed forward flight generally parallel to an aircraft longitudinal axis L. Although a particular aircraft configuration is illustrated in the disclosed embodiment, other counter-rotating, coaxial rotor systems will also benefit from the present invention. Although a particular counter-rotating, coaxial rotor system aircraft configuration is illustrated in the disclosed embodiment, other rotor systems and other aircraft types such as tilt-wing and tilt-rotor aircraft will also benefit from ...
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