Sikorsky S-25

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Sikorsky S-25 G2,3,4
Sikorsky-S-25-Ilya-Muromets-First-flown-in-March-1916-First-aircraft-in-history-with-a-tail-gunner-position-Imperial Russian Air Service.jpg
Role Bomber
Manufacturer Sikorsky
Designer Igor I. Sikorsky
First flight Winter 1915-16
Primary users Imperial Russian Aviation Roundel.svg Russia
Red star.svg Soviet
Number built 8 G2, 5 G3, 4 G4[1]
Developed from Sikorsky S-22
Wingspan 30.8 m (101 ft 2 in) [2]
Engine 4×various engines
Armament G3: 6 MGs
450–680 kg (1,000–1,500 lb) [2] of bombs[note 1]}
Max Speed G3: 126 km/h (78 mph) [2][note 2]
Climb G3: 6,500 ft (2,000 m) in 17:00 [2][note 3]
Ceiling G3: 11,500 ft (3,500 m) [2][note 4]
Endurance G3: 5:00 [2][note 5]

In winter of 1915-1916 the first Sikorsky S-25 Series G-2 Il'ya Muromets four-engine bomber was completed. Eight were built altogether. It was also known as the Kievskiy.

One gunner could assume a position atop the fuselage with his head above the top wing, with machine guns aiming fore and aft. Two other gunners were just aft of the wings using side windows in the fuselage, and a fourth was dragged to the tail on a small railed cart. This was likely the first tail-gunner position in any aircraft.

Five S-25 Type G3s were completed from early 1916 to 1917 followed by three during the Revolution, followed by roughly four S-25 Type G4 in 1917. The G-3s featured 220hp Renault engines plus 150hp R-BVZ-6 engines, twin fins, and armament of six machine guns.

S-25 Type G4s were built starting in July 1917. Perhaps only four were built before production was disrupted by the Revolution. [1]

For more information, see Wikipedia:Sikorsky Ilya Muromets.


  1. G2: 4MG+bombs [2]
  2. G2: 116 km/h (72 mph)
  3. G2: 27:00[2]
  4. G2: 9,800 ft (3,000 m) [2]
  5. G2: 6:00 [2]
  1. 1.0 1.1 Durkota, p.323.
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Lamberton, pp.228-229.
  • Alan Durkota, Thomas Darcey, and Victor Kulikov. The Imperial Russian Air Service. Flying Machines Press, 1995. ISBN 0-9637110-2-4
  • W.M. Lamberton and E.F. Cheesman, Reconnaissance & Bomber Aircraft of the 1914-1918 War. Great Britain: Harleyford Publications Ltd., 1962. ISBN 9780900435027