Wind tunnel force tests in wing systems through large angles of attack
A 1928 NASA Technical Note, issued by the National Advisory Committee for Aeronautics, reporting wind tunnel force tests on wing systems at large angles of attack for aeronautical engineers. The pictures are charts of lift and drag coefficients plotted against angle of attack for Clark Y monoplane wings with varying aspect ratio and flap settings, drawn as dense black-line graphs on grid paper with small wing-section sketches; a designer might take their clean hand-drawn plotting style, dashed and dotted curve legends, and grid structure as a model for technical diagram layouts.
