Drag Tests of 4/9-Scale Model Engine Nacelles with Various Cowlings
This NACA technical report from 1932, issued by the National Advisory Committee for Aeronautics for aeronautical engineers and researchers, presents wind tunnel drag tests on a 4/9-scale model of aircraft engine nacelles fitted with different cowlings. The plotted curves show net drag in pounds against angle of pitch in degrees, with separate lines for each cowling arrangement and a schematic of the nacelle and ring positions. A designer could take from them the clean, minimal line-and-grid style of early engineering data graphics and the simple sketch of a streamlined engine housing.
