Sikorsky S-45

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Role Flying boat airliner
National origin United States
Manufacturer Sikorsky Aircraft

The Sikorsky S-45 was a proposed double-deck transoceanic flying boat originally designed in 1938 by Sikorsky Aircraft for Pan Am. The high wing monoplane featured a single-step hull with a triple-tail and was to be powered by six Wright R-3350 Duplex-Cyclone engines which were being developed at the time. The aircraft would have competed with the Boeing 314 but no examples of the S-45 were ever manufactured.[1][2][3]


Data from Global Security[1]

General characteristics

  • Capacity: 100 passengers
  • Length: 155.5 ft (47.4 m)
  • Wingspan: 236 ft (72 m)
  • Height: 25.75 ft (7.85 m)
  • Wing area: 4,670 sq ft (434 m2) [3]
  • Empty weight: 34,930 lb (15,844 kg)
  • Gross weight: 87,000 lb (39,463 kg)
  • Powerplant: 6 × Wright R-3350 Duplex-Cyclone Air-cooled 18-cylinder radial engines, 2,500 hp (1,900 kW) each [3]


  • Cruise speed: 200 mph (322 km/h; 174 kn)
  • Range: 5,000 mi (4,345 nmi; 8,047 km)


  1. ^ a b "Sikorsky S-45 Flying Boat". 2017. Retrieved 19 May 2017.
  2. ^ "The American Fixed Wing Era". Sikorsky Archives. Retrieved 14 May 2017.
  3. ^ a b c Johnson, E.R. (2009). American Flying Boats and Amphibious Aircraft: An Illustrated History. Jefferson, North Carolina: McFarland & Company, Inc., Publishers. p. 340. ISBN 978-0-7864-3974-4.
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