Climbing efficiency of aircraft
A 1927 technical report on aircraft climbing efficiency, issued by NASA's Technical Reports Server as a scanned archival document for engineers and aviation researchers. Its three pictures are line graphs plotting horsepower percentages against speed ratios, with curves for brake and thrust horsepower, horsepower required, and wing horsepower, marked by climbing and top-speed reference lines. A designer might take from them the clean, labelled chart style of early engineering graphics, with dashed and solid curves, stepped numeric scales and handwritten-style annotations.
