The Aerodynamic Characteristics of Four Full-Scale Propellers Having Different Plan Forms
This 1938 NACA-series report from NASA's Technical Reports Server presents wind-tunnel test results for four full-scale aircraft propellers of differing blade plan forms, written for aeronautical engineers. Two pictures are performance charts plotting power coefficient, thrust coefficient and efficiency against advance ratio for several blade angles, and one shows two propeller blades photographed against a plain ground. A designer could take from the charts the clean, labelled line-graph style of technical data, and from the blades the tapering, paddle-like silhouettes of early propeller design.
