Tests in the Variable-Density Tunnel of Seven Tapered Wings Having N.A.C.A. 230 Mean Lines, Special Report
A 1937 NASA technical report of wind-tunnel tests on seven tapered wing designs using N.A.C.A. 230 mean-line airfoil sections, written for aeronautical engineers. Its pictures are dense engineering graphs of effective profile-drag and lift coefficients, moment curves, and small plan-view and airfoil section diagrams plotted in fine black lines on squared grids, showing how wing shape affects aerodynamic performance and offering a designer little beyond the plotted curves and their labels.
