# 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 to Bulgarian Army for use in World War I Number built 1 History First flight July 1912

S-7 view from aft

The **Sikorsky S-7** was a Russian single engine experimental prototype aircraft built by the [Russian Baltic Railroad Car Works](/source/Russo-Balt) shortly after [Igor Sikorsky](/source/Igor_Sikorsky) became chief engineer of the aircraft manufacturing division.

## Design and development

The S-7 was two-seater [wire-braced](/source/Flying_wires) [monoplane](/source/Monoplane) powered by a 70 hp (52 kW) [Gnome](/source/Gnome_et_Rh%C3%B4ne) air-cooled [rotary engine](/source/Rotary_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 the [S-6A](/source/Sikorsky_S-6) including the main wing, tail and landing gear.[1]

## Operational history

The S-7 was entered in the international military competition at [Saint Petersburg](/source/Saint_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 1914 [Bulgaria](/source/Bulgaria) purchased the S-7 and used it in operations during [World War I](/source/World_War_I).[1]

## Specifications

*Data from* *Russian 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](/source/Gnome_Lambda) 7-cylinder air-cooled rotary piston engine, 70 hp (52 kW)

**Performance**

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

## References

1. ^ [***a***](#cite_ref-winged_1-0) [***b***](#cite_ref-winged_1-1) Sikorsky, Igor (1944). *The Story of the Winged-S*. New York: Dodd, Mead & Company. p. 43. [ISBN](/source/ISBN_(identifier)) [9781258163556](https://en.wikipedia.org/wiki/Special:BookSources/9781258163556). {{[cite book](https://en.wikipedia.org/wiki/Template:Cite_book)}}: ISBN / Date incompatibility ([help](https://en.wikipedia.org/wiki/Help:CS1_errors#invalid_isbn_date))

1. **[^](#cite_ref-ram_2-0)** ["S-7"](https://ram-home.com/ram-old/index.html). *ram-home.com*. 4 September 1997. Retrieved 2 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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Adapted from the Wikipedia article [Sikorsky S-7](https://en.wikipedia.org/wiki/Sikorsky_S-7) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Sikorsky_S-7?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.