Power Output and Air Requirements of a Two-stroke Cycle Engine for Aeronautical Use
This is a 1927 technical report from the NACA aeronautical research series, prepared for engineers studying engine performance, and it is a government technical report rather than a commercial book. The pictures show a two-stroke engine's fuel injection mechanism, test curves for specific fuel and air consumption against brake horsepower at several engine speeds, and charts of compression pressure and air flow against supply pressure. A designer might take from them the clean, schematic look of early engineering test graphs, with their labeled axes, plotted data points, and close photographs of mechanical hardware.
