Effect of Variation of Chord and Span of Ailerons on Rolling and Yawing Moments at Several Angles of Pitch
A 1931 NASA technical report on aileron research, issued for aeronautical engineers and aircraft designers, and it shows the effect of varying aileron chord and span on rolling and yawing moments at several pitch angles. Its pictures are plain line graphs with solid and dashed curves, labelled by angle of attack and aileron position, and a designer might take from them the clear grammar of data plotting: stepped families of curves, dashed secondary series, and sparse grid axes.
