Sikorsky S-45

The Sikorsky S-45 was a proposed double-deck transoceanic flying boat designed in 1938 by Sikorsky Aircraft for Pan Am. The high-wing monoplane had a single-step hull and a triple tail and was to be powered by six Wright R-3350 Duplex-Cyclone engines, which were then still in development. It was planned to carry 100 passengers with a wingspan of 236 feet and a range of 5,000 miles at a cruising speed of 200 miles per hour, and it would have competed with the Boeing 314. No example of the S-45 was ever manufactured.