The Sikorsky Twin Engined Amphibian, Type S-38, Model 1928
This is a 1928 NACA Aircraft Circular, issued by the National Advisory Committee for Aeronautics in the United States, for engineers and aircraft builders, documenting the Sikorsky S-38 twin-engined amphibian flying boat. The pictures are plates of photographs and scaled drawings showing the aircraft's wings, hull, cabin interior and factory production, which a designer could use for studying early aviation engineering and industrial plan layouts.
