K.A.C»A. Technical Memorandum No* 825 Figs.18,19.20,21 … Direct- ional effect of the funda- mental note. Fig^ire 21,- Figure 20.- Directional ef- Directional ef- fect of the com- fect of the com- ponents of the ponents of the propeller noise. propeller noise, n= 16950 r.p.m. n = 14150 r.p.m.
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
