The Effect of Compressibility on Eight Full-Scale Propellers Operating in the Take-Off and Climbing Range
This is a 1938 NACA-style technical report, published by the National Advisory Committee for Aeronautics in the United States, for aircraft engineers and propeller designers studying compressibility effects on full-scale propellers. The pictures are dense engineering line graphs: families of curves plotting efficiency and thrust coefficients against advance ratio, with dashed and solid traces for different propeller speeds and blade-angle settings, set in a plain grid with small labels. A designer could borrow the restrained monochrome grid and layered curve families as a model for technical data visualisation or minimalist line charts.
