Effect of tip shape and dihedral on lateral-stability characteristics
This is a 1937 NASA technical report, issued as an aeronautical research paper on how wing tip shape and dihedral angle affect lateral stability, with graphs of lift and moment coefficients plotted against angle of attack and dihedral angle for wind-tunnel tests. Its pictures are plain line graphs with gridded axes, labelled data series, and small markers, and a designer might take from them only the visual language of technical charts: clean grids, stepped curves, and legend keys.
