Modelling and characterization of a novel gimbal two-blade helicopter rotor

Abstract

A novel rotor design specifically conceived for lightweight helicopters is described and analyzed with respect to its kinematic and basic performance characteristics. The design is based on an innovative gimbal mount which allows a quasi-constant-speed transmission from the mast to the hub in a wide variety of relative motions between these two elements. This is motivated by the need of alleviating substantial oscillating rotor loads transmitted to the mast as a result of cyclic flapping. The rotor design is illustrated in detail and the results of several studies are reported, which assess the validity of the proposed design and pave the way to further analysis concerned with the rotor dynamic behaviour