Tests on thirteen navy type model propellers
A 1927 NASA technical report of wind-tunnel tests on thirteen model propellers of the navy type, compiled for aeronautical engineers and researchers. Its two pictures are paired graphs of efficiency, thrust and torque coefficients plotted against advance ratio V/nD, with curves rising to a peak and falling away. A designer might borrow their clean line-chart structure, grid layout and labelled axis conventions for technical diagram work.
