Wind-Tunnel Investigation of Wings with Ordinary Ailerons and Full-Span External-Airfoil Flaps
This is a 1937 NACA technical report on wind-tunnel tests of wing designs with ordinary ailerons and full-span external-airfoil flaps, issued by NASA's Technical Reports Server for aeronautical engineers. The single photograph shows a man in a suit seated beside a large wing model mounted on struts inside a tunnel test section, with a bare grey wall behind it. A designer could take from it the stark, documentary look of early aerodynamic laboratory photography, with its strong diagonal bracing and centred symmetrical composition.
