Patent ID: 6302356
Filing Date: 2001-10-16
Classification: B64C

Abstract:
A combination, comprising:a helicopter having a main rotor;a pair of gas turbine engines mounted to said helicopter, each engine of said pair of gas turbine engines having an engine power output shaft;a pair of nose gearboxes mounted to said helicopter, each nose gearbox of said pair having an input coupled to one of said engine power output shafts, and each nose gearbox of said pair having a power output shaft; anda two stage main reduction gearbox having a first stage power input portion and a second stage power output portion, said power input portion being coupled to said power output shafts of said nose gearboxes, and said power output portion being coupled to said main rotor;said power input portion having a gear reduction first stage speed ratio exceeding 5.5 to 1.