ACOUSTIC SPECTRA AND DETECTION OF VIBRATING ROTOR BLADES, INCLUDING ROW-TO-ROW INTERFERENCE Vinod G. Mengle G.E. Aircraft Engi -. - Ci nci nnati , Ohio nes AIM 13th Aeroacoustics Conference October 22-24, 1990 I Tallahassee, FL For permision to copy or republish, contact the American Institute of Aeronautics and Astronautics 370 L'Enfant Pmmenade, S.W., Washington, D.C. 20024