Wind-Tunnel Tests of a 10-foot-diameter Gyroplane Rotor
A 1936 NASA technical report on wind-tunnel tests of a 10-foot-diameter gyroplane rotor, written for aeronautical engineers and researchers rather than general readers. Its pictures are plain engineering graphs of lift, thrust, drag and angle of attack against tip-speed ratio and blade pitch, drawn as fine black curves on squared grids, which a designer might borrow as spare minimalist chart motifs.
