|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.
Specifications (Shvetsov M-25)
- Type: 9-cylinder, air-cooled, radial engine
- Bore: 6.125 in (155.6 mm)
- Stroke: 6.875 in (174 mm)
- Displacement: 1,823.1 in³ (29.876 L)
- Dry weight: 499 kg (1,100 lb)
- Supercharger: Single speed, single stage, geared centrifugal supercharger
- Fuel system: 1 K-25 (Solex) Carburetor
- Power output: 700-800hp depending on model
- Compression ratio: 6.4:1
|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.