01465nam 2200373Ia 450 991069898440332120090616103436.0(CKB)5470000002398028(OCoLC)401294309(EXLCZ)99547000000239802820090616d1986 ua 0engurbn||||a||||txtrdacontentcrdamediacrrdacarrierWind-tunnel acoustic results of two rotor models with several tip designs[electronic resource] /R.M. Martin and Andrew B. ConnorHampton, Va. :National Aeronautics and Space Administration, Scientific and Technical Information Branch,[1986]1 volumeNASA technical memorandum ;87698Title from title screen (viewed on May 19, 2009)."July 1986."Wind tunnel acoustic results of two rotor models with several tip designsRotors (Helicopters)NoiseRotors (Helicopters)Noise.Martin R. M(Ruth McVoy),1956-1410052Connor Andrew B1410053United States.National Aeronautics and Space Administration.Scientific and Technical Information Branch.GPOGPOBOOK9910698984403321Wind-tunnel acoustic results of two rotor models with several tip designs3497954UNINA