Shvetsov M-25
The Shvetsov M-25 was an aircraft radial engine produced in the Soviet Union (USSR) in the 1930s and 1940s, a licensed production variant of the Wright R-1820-F3.
| M-25 | |
|---|---|
 | |
| Type | Radial engine |
| Manufacturer | Shvetsov |
| Number built | 13,888 |
| Developed from | Wright R-1820 |
| Developed into | Shvetsov ASh-62 |
Design and development
The first M-25s were produced from kits imported from the United States; the main difference between the later M-25 and the R-1820-F3 was the use of metric components. 13,888 M-25s were produced in the USSR at factories in Perm and Kazan. There were a number of sub-variants which differed from the original M-25 in that they had reduction gears, rather than direct drive. Performance was similar to the equivalent Wright engines. The M-25 was later developed into the ASh-62 and was later used as a pattern for the M-70. The M-70, a twin-row 18-cylinder engine, eventually developed into the ASh-73 which powered the Tupolev Tu-4, a reverse-engineered copy of the Boeing B-29.
Applications
Specifications (Shvetsov M-25)
General characteristics
- Type: 9-cylinder, air-cooled, radial engine
- Bore: 155.5 mm (6.122 in)
- Stroke: 174.5 mm (6.870 in)
- Displacement: 29.876 L (1,823.1 cu in)
- Length: 1,100 mm (43.307 in)
- Diameter: 1,365 mm (53.740 in)
- Dry weight: 434 kg (957 lb)
Components
- Supercharger: Single speed, single stage, geared centrifugal supercharger
- Fuel system: 1 K-25 (Solex) Carburetor
Performance
- Power output: 700-800hp depending on model
- Compression ratio: 6.4:1
References
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Wikimedia Commons has media related to Shvetsov M-25. |
- Gunston, Bill (1986). World Encyclopedia of Aero Engines. Wellingborough: Patrick Stephens. p. 175.
- Kotelnikov, Vladimir (2005). Russian Piston Aero Engines. Crowood Press Ltd. pp. 118–119.