The Effect of Reduction Gearing on Propeller-body Interference as Shown by Full-Scale Wind-Tunnel Tests
This 1931 NACA technical report, issued by the National Advisory Committee for Aeronautics in the United States for aeronautical engineers and researchers, presents full-scale wind-tunnel tests of propeller and fuselage interference with geared versus direct-drive propellers. Its pictures are plain engineering line graphs, with thrust and power coefficient curves and efficiency curves plotted against advance ratio, drawn in black ink on white paper. A designer could take from them the clean chart conventions of dual-axis plots, dashed comparison lines, and tabular labelling.
