The effect of the masses of the controls on the longitudinal stability with free elevator. Part I
A 1939 NACA technical report from the NASA Technical Reports Server, written for aeronautical engineers and researchers, examining how control-surface masses affect longitudinal stability of an aircraft with a free elevator. The pictures are plain line graphs of pitching moment against angle of attack, with dashed and solid curves, plus a few small aircraft sketches and tables of weight-moment plots. A designer might take from them the clean diagrammatic style of technical charts and the simple sketches of aircraft tail and elevator configurations.
