Sikorsky S-45

S-45
S-45
General information
Type	Proposed flying boat airliner
National origin	United States
Manufacturer	Sikorsky Aircraft
Number built	0

Last updated January 04, 2026

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]

Specifications

Data fromGlobal 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]

Performance

Cruise speed: 200 mph (320 km/h, 170 kn)
Range: 5,000 mi (8,000 km, 4,300 nmi)

References

1 2 "Sikorsky S-45 Flying Boat". www.globalsecurity.org. 2017. Retrieved 19 May 2017.
↑ "The American Fixed Wing Era". www.sikorskyarchives.com. Sikorsky Archives. Retrieved 14 May 2017.
1 2 3 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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[glo-1] 1 2 "Sikorsky S-45 Flying Boat". www.globalsecurity.org. 2017. Retrieved 19 May 2017.

[sik-2] "The American Fixed Wing Era". www.sikorskyarchives.com. Sikorsky Archives. Retrieved 14 May 2017.

[ame-3] 1 2 3 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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v t e Sikorsky aircraft
Fixed-wing aircraft (company designations)	S-1 S-2 S-3 S-4 S-5 S-6 S-7 S-8 S-9 S-10 S-11 S-12 S-13 S-14 S-15 S-16 S-17 S-18 S-19 S-20 S-21 S-22/23/24/25/26/27 S-28 S-29-A S-30 S-31 S-32 S-33 S-34 S-35 S-36 S-37 S-38 S-39 S-40 S-41 S-42 S-43 VS-44 S-45
Fixed-wing aircraft (military designations)	C-6 C-28 JRS JR2S PS P2S RS XBLR-3 XPBS XSS XV-2
Helicopters (company designations)	VS-300 (S-46) S-47 S-48 S-49 S-50 S-51 S-52 S-53 S-54 S-55 S-56 S-57 S-58 S-59 S-60 S-61 S-61L/N S-61R S-62 S-63 S-64 S-65 S-66 S-67 S-68 S-69 S-70 S-71 S-72 S-73 S-74 S-75 S-76 S-80 S-92 S-95 S-97 S-100 S-102 S-103 S-300 S-333 S-434
Helicopters (military designations)	SH-3 Sea King HH-3E/F R-4 H-5 H-6 H-18 H-19 Chickasaw H-34 Choctaw CH-37 Mojave XH-39 HH-52A Seaguard CH-53 Sea Stallion CH-53E Super Stallion CH-53K King Stallion MH-53 CH-54 Tarhe UH-60 Black Hawk HH-60G Pave Hawk HH-60J/MH-60T MH-60R/S Seahawk SH-60B/F Seahawk H-60J/K VH-60 RAH-66 Comanche VH-92 Patriot CH-124 Sea King CH-148 Cyclone HLH
Experimental aircraft	Cypher/Cypher II Firefly Raider Raider X SB-1 X2 XBLR-3 XV-2