Shape and strength of seaplane under-structures with special regard to seaworthiness
A 1921 NACA technical report on seaplane float and under-structure design, issued by the aeronautical research body for engineers and aircraft designers studying seaworthiness. The pictures are line diagrams of truss frames, force arrows and float profiles, with numbered members and labelled figures, offering a designer structural schematics of braced floats and hulls rather than decorative imagery.
