Comparative Performance Obtained with XF7C-1 Airplane Using Several Different Engine Cowlings (1930)
NASA Technical Reports Server (NTRS) · leaf 23
N.A.C.A. Teohnlcal Note No.334 … Fig. 11 Three-quarTjer front view of exhaust oolleotor ring oowllng as used on XF7C-1 airplane over service type cowling.
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
