[Reports] / Amer.inst.of aeronautics and astronautics. N 89-2820 : Design of a gear drive system for counter-rotating fan rotors : Rep. presented at the AIAA/ASME/SAE/ASEE 25th joint propulsion conf.,Monterey(Ca),July 10-12,1989 / D.C.Howe,A.H.McKibbin, 1989. - 11 p. - Текст : непосредственный.