| M-25 | |
|---|---|
 | |
| Type | Radial engine |
| Manufacturer | Shvetsov |
| Number built | 13,888 |
| Developed from | Wright R-1820 |
| Developed into | Shvetsov ASh-62 |
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.
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, an unlicensed, reverse-engineered copy of the Boeing B-29 Superfortress.
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