Preliminary Tests of Blowers of Three Designs Operating in Conjunction with a Wing-Duct Cooling System for Radial Engines, Special Report
A 1939 NACA special report by the National Advisory Committee for Aeronautics, held in the NASA Technical Reports Server, presenting preliminary tests of three blower designs for cooling radial aircraft engines through a wing duct. The three pictures are engineering drawings of blowers with cross-section and front-view elevations, with dimension lines, flow arrows, propeller hubs, and labelled elliptical-shaped spinners, giving a designer a clear model of technical line-drawing layout and annotation.
