The Problem of the Propeller in Yaw with Special Reference to Airplane Stability
This is a 1933 NACA Technical Memorandum from the National Advisory Committee for Aeronautics, issued as a government engineering report for aerodynamicists studying propeller behaviour in aircraft stability. The pictures are engineering plates: graphs of performance curves, vector diagrams of blade forces, slipstream velocity profiles, and photographs of wind-tunnel test rigs. A designer might take from them the clean, monochrome technical-drawing look of early aeronautical research, with its fine grid lines, labelled vectors, and dense plotted curves.
