Comparative Flight Performance with an NACA Roots Supercharger and a Turbocentrifugal Supercharger
This is a 1931 NACA technical report by NASA's technical reports server comparing flight performance of aircraft fitted with a Roots supercharger against one with a turbocentrifugal supercharger, written for aeronautical engineers and researchers. Its charts plot true airspeed, altitude, temperature and engine speed for climb and level flight, and a designer could take from them the clean, precise graph style of technical line charts, with dashed and solid curves, labelled axes and plain black-and-white plate photographs of aircraft engines.
