Patent ID: 7594623

Claim:
An engine mounting system for use in rotorcraft having a rotor, a pylon assembly, a transmission coupled to the pylon assembly, and an engine, the engine mounting system comprising: a forward mount for coupling the engine to the transmission, the forward mount having selected physical characteristics and comprising: an annular base portion configured for coupling to the engine, the annual base portion having a first outside diameter; an annular top portion configured for coupling to the transmission; and an annular flexure region disposed between the annular base portion and the annular top portion, the annular flexure region comprising: a first part having a second outside diameter that is less than the first outside diameter; and a second part forming a transition in outside diameter between the second outside diameter and the first outside diameter; and an aft mount for coupling the engine to the pylon assembly; wherein the forward mount is configured, such that a contribution from the engine to the dynamic response of the engine mounting system is determined by a selected physical characteristics of the flexure region; wherein the aft mount comprises: a bipod disposed in a plane generally transverse to the longitudinal axis of the engine; wherein the aft mount is configured to avoid reaction of torque, such that only the forward mount reacts torque, thereby eliminating torsional redundancy in the engine mounting system, so as to thereby prevent torque from the rotor from being induced into the engine by the aft mount.