The horsepower of aircraft engines and their maximum frontal area
A 1936 NASA Technical Memorandum on aircraft engine horsepower and maximum frontal area, written for aeronautical engineers and researchers. Its single page of graphs plots engine-related ratios on ruled axes with labelled tick values and sets of diagonal reference lines, showing how the variables relate. A designer could borrow the clean technical chart layout, the thin grid lines and the small serif axis labels for an industrial or scientific graphic.
