Shvetsov M-25
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The Shvetsov M-25 was an aircraft radial engine produced in the Soviet Union in the 1930s and 40s, a licensed production variant of the Wright R-1820-F3.
The first M-25s were produced from kits imported from the United States and the main difference between the later M-25 and the R-1820-F3 is 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 being 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.
[edit] Specifications (Shvetsov M-25)
General characteristics
- Type: 9-cylinder, air-cooled, radial engine
- Bore: 6.125 in (155.6 mm)
- Stroke: 6.875 in (174 mm)
- Displacement: 1,823 in³ (29.88 L)
- Dry weight: 499kg (999lb)
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
[edit] Applications
- Neman R-10
- Polikarpov I-14
- Polikarpov I-15bis
- Polikarpov I-153
- Polikarpov I-16
[edit] References
- Gunston, Bill (1986). World Encyclopedia of Aero Engines. Wellingborough: Patrick Stephens, 175.
- Kotelnikov, Vladimir (2005). Russian Piston Aero Engines. Crowood Press Ltd., p.118-119.
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