Performance of a 300-horsepower Hispano-Suiza airplane engine
This is a 1921 technical report from NASA's Technical Reports Server on the performance of a 300-horsepower Hispano-Suiza aircraft engine, written for engineers and aviation researchers. Its pictures are plain engineering line graphs with grid axes, black curves and dashed lines plotting rpm, air density, fuel consumption, heat balance and propeller loads at several altitudes. A designer could take from them only the restrained, data-driven graphic language of early engineering charts: thin rules, labelled curves, and tabular plotting.
