Methods of Visually Determining the Air Flow Around Airplanes (1932)
NASA Technical Reports Server (NTRS) · leaf 14
Reproduced from best available copy. N.A.C.A. Technical Note No. 425 Fig. 6 … yig. 6 Kersene smoke passing through propeller plane of Ourtlss XF7C-1 airplane.
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
