Wind-Tunnel Tests on a Series of Wing Models Through a Large Angle of Attack Range. Part I : Force Tests
This is a 1930 NACA technical report of wind-tunnel force tests on wing models across a wide range of angles of attack, issued by the National Advisory Committee for Aeronautics for aeronautical engineers and researchers. The pictures are black-and-white engineering diagrams: airfoil section outlines with radiating vector lines showing forces, plus grid-plotted graphs of lift and drag coefficients against angle, offering a designer a stark, precise vocabulary of technical linework.
