The Effect of the Angle of Afterbody Keel on the Water Performance of a Flying-Boat Hull Model
This is a 1935 NACA technical note on flying-boat hull research, published by NASA's Technical Reports Server and aimed at aeronautical engineers testing seaplane hulls in tanks. The pictures are rotated engineering charts and drawings: plotted curves of resistance and trim against speed, plus a hull profile and keel sections with dimensioned callouts. A designer could take from them the restrained line-graph style of technical plots and the sweeping curved profile of a boat hull.
