Propeller scale effect and body interference
A 1925 NACA technical note from the NASA Technical Reports Server, presenting engineering test data on propeller scale effect for aeronautical researchers. One picture is a line graph comparing power absorbed by full-scale and model propellers, plotted as ratio curves against V/nD with solid and dashed lines and labelled propeller pitch series. A designer could borrow its clean grid-and-curve data-plot layout, with thin dark lines, sparse markers and small serif axis labels, for technical or diagrammatic visual language.
