Aerodynamic Characteristics of Twenty-Four Airfoils at High Speeds
This is a 1930 NASA technical report of aerodynamic test data for twenty-four airfoil sections, issued by the NASA Technical Reports Server collection for aeronautical engineers and researchers. The pictures are engineering line graphs with plotted curves of drag and lift coefficients against camber ratio and position of maximum gradient, plus one polar diagram of lift against drag; a designer might take their clean grid layouts, numbered curve labels and restrained monochrome linework as a model for technical diagrams.
