The Reduction of Aileron Operating Force by Differential Linkage
This is a 1936 NACA Technical Note from the NASA Technical Reports Server, a government aeronautical engineering report written for aircraft engineers and designers, describing how a differential aileron linkage can reduce the control force a pilot needs. The pictures are plain engineering graphs, a linkage schematic and a geometric construction in black line on white, with no decorative art, offering a designer clean grid and curve layouts and diagram conventions.
