Wind-tunnel of three lateral-control devices in combination with a full-span slotted flap on an NACA 23012 airfoil
This is a 1938 NACA technical note from NASA's Technical Reports Server, reporting wind-tunnel tests of three lateral-control devices with a full-span slotted flap on an NACA 23012 airfoil, written for aeronautical engineers. Its pictures are dense engineering plots of rolling, yawing and hinge-moment coefficients against aileron deflection in degrees, drawn as ruled grids with labelled curves, sometimes with small airfoil sketches. A designer might borrow the crisp grid-and-curve plotting style, the clean line hierarchy, and the restrained monochrome technical layout.
