Characteristics of Five Propellers in Flight
A 1928 NASA technical report on propeller performance, published in the United States for aeronautical engineers and researchers. Its pictures are plain engineering charts: paired line graphs of rpm, horsepower and rate of climb against miles per hour, coefficient curves for full-scale and model propellers, and rotated blade-outline diagrams with dimensioned sections. A designer could draw on their clean, grid-based linework and restrained two-tone plotting for technical diagram styling.
