Aerodynamic characteristics of wings with cambered external airfoil flaps, including lateral control, with a full-span flap
This is a 1936 NASA technical report on wind-tunnel tests of wing configurations with cambered external flaps and lateral control, prepared for aeronautical engineers and aircraft designers. The pictures are dense engineering charts of NACA airfoil sections, plotting lift-to-drag ratio, lift and drag coefficients, centre-of-pressure travel and moment coefficient against angle of attack, with cross-section diagrams and tabulated ordinates in dark ink on pale paper; a designer might take their clean grid layouts and labelled curve styles as reference for technical diagrams.
