Determination of the air forces and moments produced by the ailerons of an airplane
This is a 1928 aeronautics technical report issued by the NACA-era aeronautical research community, a series of engineering data sheets on aileron forces and moments for airplane design. The four plates are graphs and a wing sketch: curves of aileron effectiveness and lift coefficient plotted against span ratio and angle of attack, and a spanwise lift distribution diagram. A designer could take the clean plotted-line style and the labelled family of curves as a model for technical diagrams with multiple parameter lines.
