Wind-tunnel investigation of ordinary and split flaps on airfoils of different profile
This is a 1937 NASA technical report of wind-tunnel test results on aircraft wing sections, compiled by the NASA Technical Reports Server for aeronautical engineers and researchers studying flap designs. Its pictures are dense engineering graphs with grid lines, multi-curve plots of lift, drag, and moment against angle of attack, and legend boxes, which a designer might take from as examples of technical data layout and a restrained monochrome chart style.
