This appears to be an early concept for the Hughes HK-1 Hercules (“Spruce Goose”) featuring twin fuselages. It should be pointed out that a twin fuselage cargo aircraft is a reasonable notion; by spreading the load across the wingspan, the stress on the wing, and the moment arm at the point of attachment to the load (i.e. the fuselage) is greatly reduced. The usual complaint about a multi-body aircraft is that the “wide stance” means the landing gear would be equally wide, necessitating ridiculously broad runways. For for a seaplane, that’s not as much of an issue. Aerodynamic drag and construction costs, however, are generally greater for a multi-body design.
Origin of this image seems to be HERE. The claim is that this photo was taken at the
