The Drag of a J-5 Radial Air-Cooled Engine
A 1928 NASA technical report on the drag of a J-5 radial air-cooled aircraft engine, issued through the NASA Technical Reports Server for aeronautical engineers and researchers. The single plate shows a photographed aircraft engine with its cowling, and four numbered panels compare circular, sector and streamline cowl rings, with a propeller and nose cowl in the bottom panel; a designer might take its stark black-and-white engineering photography and grid-of-panels layout as a clean, documentary reference.
