Tank Tests of Auxiliary Vanes as a Substitute for Planing Area
This is a 1934 NACA technical note, Report No. 490, reporting tank tests of auxiliary vanes used in place of planing area on seaplane hulls, written for aeronautical engineers and naval aviation researchers. The plates are graphs of resistance, trim and spray angles against speed, followed by photographs of scale hull models fitted with vanes. A designer might take from them the clean, dense engineering-chart look of 1930s technical plates, with thin black curves on white and small serif captions, plus sleek streamlined hull silhouettes.
