Analysis of W. F. Durand's and E. P. Lesley's propeller tests
This is a 1924 NACA-era technical report analysing propeller performance data from W. F. Durand and E. P. Lesley's wind-tunnel tests, published through the NASA Technical Reports Server for aeronautical engineers and researchers. Its pictures are plain line charts of propeller efficiency plotted against speed ratio, with labelled curves for numbered propeller designs, grid backgrounds, and boxed legends listing blade shape, pitch and section; a designer might borrow the clean graph layouts, numbered curve labels and boxed captions as a restrained technical diagram style.
