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Sikorsky S-7

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Experimental Russian monoplane prototype from 1912

S-7
Sikorsky S-7 circa 1912
General information
Type	Experimental
National origin	Russian Empire
Manufacturer	Russian Baltic Railroad Car Works
Designer	Igor Sikorsky
Status	sold toBulgarian Army for use in World War I
Number built	1
History
First flight	July 1912

TheSikorsky S-7 was a Russian single engine experimental prototype aircraft built by theRussian Baltic Railroad Car Works shortly afterIgor Sikorsky became chief engineer of the aircraft manufacturing division.

Design and development

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The S-7 was two-seaterwire-braced monoplane powered by a 70 hp (52 kW)Gnome air-cooledrotary engine. Construction began in early summer of 1912 and completed in July. The pilot sat in the rear cockpit with a passenger seated in a forward compartment in a tandem arrangement. The fuselage was enclosed in plywood and the aircraft used components taken from theS-6A including the main wing, tail and landing gear.^[1]

Operational history

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The S-7 was entered in the international military competition atSaint Petersburg in August 1912. During a take-off attempt from a furrowed field the landing gear was severely damaged and the S-7 was unable to finish the completion. In 1913 the aircraft was repaired and served as a trainer. In 1914Bulgaria purchased the S-7 and used it in operations duringWorld War I.^[1]

Specifications

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Data fromRussian Aviation Museum^[2]

General characteristics

Crew: One
Capacity: One passenger
Length: 26 ft 11 in (8.2 m)
Upper wingspan: 32 ft 10 in (10 m)
Wing area: 220 sq ft (20 m²)
Empty weight: 990 lb (449 kg)
Gross weight: 1,711 lb (776 kg)
Powerplant: 1 ×Gnome Lambda 7-cylinder air-cooled rotary piston engine, 70 hp (52 kW)

Performance

Maximum speed: 67 mph (108 km/h, 58 kn)

References

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^^a ^bSikorsky, Igor (1944).The Story of the Winged-S. New York: Dodd, Mead & Company. p. 43.ISBN 9781258163556.{{cite book}}:ISBN / Date incompatibility (help)
^"S-7".ram-home.com. 4 September 1997. Retrieved2 April 2017.

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

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