Full-Scale Tests of Metal Propellers at High Tip Speeds
A 1932 NASA technical report on full-scale tests of metal aircraft propellers at high tip speeds, published as a text-and-graph research document for aeronautical engineers. Its single page pairs dense typeset explanation with line graphs plotting propeller efficiency and power coefficients against a dimensionless speed ratio, with curves for several blade designs. A designer could borrow the clean black-line chart style, the labelled coordinate axes and the stepped family of curves as a restrained technical graphic language.
