A NEW MODEL OF ROTOR DYNAMICS DURING PITCH AND ROLL OF A HOVERING HELICOPTER

A new model of rotor dynamics during pitch and roll of a hovering heli copter (or a helicopter in slow axial flight) is presented. This model is based on the aerodynamic model TEMURA (Technion Model of Unsteady Rotor Aerodynamics) that has been developed during recent years. After a description of the new aerodynamic model, its application to calcul ate the flapping dynamics during pitch is presented. The derivation al so includes the calculation of the loads that are transferred to the f uselage. The model is used to study the rotor behavior during pitch an d roll. It is shown that the new model is capable of predicting correc tly the helicopter off-axis response, a phenomenon that was beyond the capability of previous models.