Experimental research on air propellers V
A 1923 NASA technical report on experimental air propeller research, issued as a numbered series of aerodynamic test results for aeronautical engineers and propeller designers. Its pictures are plain black-and-white line graphs of propeller coefficient curves plotted against advance ratio, and rows of dark-shaded propeller blade cross-section profiles at successive radial stations, which a designer could take as a reference for measured curve shapes and airfoil outlines.
