Calculation of the induced efficiency of heavily loaded propellers having infinite number of blades
This is a 1939 NACA technical memorandum, issued by the National Advisory Committee for Aeronautics for aeronautical engineers and researchers, presenting calculations of induced efficiency for heavily loaded propellers with an infinite number of blades. Its pages are dense with line graphs of efficiency and coefficient curves plotted against advance ratio, flying speed and loading parameters, drawn in thin black lines with labelled families of curves, grid lines and figure captions. A designer could draw on their clean, sparse plotting style, with rows of stacked graphs and legible tick-marked axes, for technical diagram layouts or data-visualisation templates.
