Sphere drag tests in the variable density wind tunnel
This N.A.C.A. technical note from 1929, issued by the National Advisory Committee for Aeronautics for aeronautical engineers and researchers, reports sphere drag measurements taken in a variable density wind tunnel. The first picture is a graph of drag coefficient against Reynolds number comparing tunnel configurations, while the second is a rotated cross-section drawing of the tunnel with a sphere mounting, offering a designer plain engineering line charts and technical drawing conventions to borrow for diagrammatic layouts.
