The span as a fundamental factor in airplane design
A 1928 technical report from NASA's Technical Reports Server, a scanned aeronautics paper rather than a trade book, which treats wingspan as a basic design parameter for aircraft. Its pictures are line diagrams: a sketch of forces on a turning aircraft, plotted curves of angle against position, and stepped views of a biplane tilting over one to four seconds, with a graph of strength versus speed. A designer might borrow the clean engineering line work, the stepped sequence of motion, and the plain graph styling.
