A Comparison of Propeller and Centrifugal Fans for Circulating the Air in a Wind Tunnel (1928)
NASA Technical Reports Server (NTRS) · leaf 11
Fig. 5. N.A.C.A. six inch wind tunnel with propeller fan drive. Dynamic ~ Pressure Reference Line Centrifuga/ Fan Propeller Fan Fig. 6. Photographic recording Manometer records.
NASA Technical Reports Server (NTRS) · Legacy CDMS · Weick
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
