[Reports] / Amer.inst.of aeronautics and astronautics. N 90-3986 : Noise reduction of short ducted fan by using forward swept and inclined blade / K.Ohtsuta,S.Akishita;Rep.presented at AIAA 13th aeroacoustics conf.Oct.22-24,1990,Tallahassee(Fl), 1990. - 7 p. - Текст : непосредственный.