[Reports] / Amer.inst.of aeronautics and astronautics. N 90-2156 : Efficiency study comparing two helicopter planetary reduction stages : Rep. presented at the AIAA/SAE/ASME/ASEE 26th joint propulsion conf., July 16-18, 1990, Orlando(Fl) / T.L.Krantz,R.F.Handschuh, 1990. - 9 p. - Текст : непосредственный.