Preliminary Tests of Nose- and Side- Entrance Blower Cooling Systems for Radial Engines, Special Report
A 1939 NACA special report from the NASA Technical Reports Server on preliminary wind-tunnel tests of nose- and side-entrance blower cooling systems for radial aircraft engines, written for aeronautical engineers. Its pictures are plain engineering graphs with ruled grids, labelled curves and dashed or solid line styles plotting coefficients against a V/nL axis, which a designer could use as a restrained source of technical chart layouts and line-plot typography.
