[Reports] / Amer.inst.of aeronautics and astronautics. N 90-3971 : Some far-field acoustics characteristics of the XV-15 tilt-rotor aircraft : Rep.presented at the AIAA 13th aeroacoustics conf.,Oct.22-24,1990,Tallahassee(Fl) / R.A.Golub,L.E.Becker,C.K.Rutledge и др, 1990. - 14 p. - Текст : непосредственный.