Wind-Tunnel Tests of 10-foot-diameter Autogiro Rotors
This is a 1937 NACA technical report on wind-tunnel tests of 10-foot-diameter autogiro rotors, issued by the National Advisory Committee for Aeronautics for aeronautical engineers and researchers. The pictures are plain engineering line graphs with gridded axes, plotting lift coefficient and flapping angles against tip-speed ratio across pitch settings, with small inset charts and curves labelled by blade angle; a designer might take their clean monochrome grid and labelled-curve layout as a model for technical diagrams.
