A study of curvilinear flight
A 1931 NACA technical report on curvilinear flight, a study of how aircraft behave when turning, issued by the National Advisory Committee for Aeronautics for aeronautical engineers and researchers. Its pictures are graphs of angular rate, angle of attack and lift coefficient plotted against time and velocity, with a few schematic wing sections; a designer might take from them the clean line-and-grid vocabulary of early engineering charts.
