Static thrust of airplane propellers
A 1934 NASA technical report on static thrust of airplane propellers, produced for aeronautical engineers and researchers studying propeller performance. Its two charts plot static thrust coefficient against blade angle at 0.75 R, with points for two, three and four blades, and a blade angle correction against propeller diameter from 8 to 14 feet. A designer could take from them the plain engineering-graph vocabulary of labelled axes, marker symbols, and smooth fitted curves over grid paper.
