[Reports] / Amer.inst.of aeronautics and astronautics. N 89-1147 : Importance of engine as a source of helicopter external noise : Rep. presented at the AIAA 12th aeroacoustics conf.,Apr. 10-12,1989, San Antonio(Tx) / R.JanakiRam,M.J.Smith,H.Tadghighi, 1989. - 13 p. - Текст : непосредственный.
Tadghighi H. analytical model for prediction of main rotor/tail rotor interaction noise : Rep. presented at the AIAA 12th aeroacoustics conf.,Apr. 10-12,1989/San Antonio(Tx) / H.Tadghighi, 1989. - 14 p. - Текст : непосредственный.