Shvetsov M-25
Soviet aircraft engine
title: "Shvetsov M-25" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["1930s-aircraft-piston-engines", "aircraft-air-cooled-radial-piston-engines", "shvetsov-aircraft-engines", "soviet-union–united-states-relations"] description: "Soviet aircraft engine" topic_path: "geography/united-states" source: "https://en.wikipedia.org/wiki/Shvetsov_M-25" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Soviet aircraft engine ::
::data[format=table title="infobox aero engine"]
| Field | Value |
|---|---|
| name | M-25 |
| image | Shvetsov M-25A.jpg |
| engine_type | Radial engine |
| manufacturer | Shvetsov |
| number_built | 13,888 |
| developed_from | Wright R-1820 |
| developed_into | Shvetsov ASh-62 |
| :: |
|name= M-25 |image = Shvetsov M-25A.jpg |caption = |engine_type= Radial engine |national_origin = |manufacturer= Shvetsov |first_run= |major_applications= |number_built = 13,888 |developed_from = Wright R-1820 |developed_into = Shvetsov ASh-62 |variants_with_their_own_articles =
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.
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, an unlicensed, reverse-engineered copy of the Boeing B-29 Superfortress.
Applications
Specifications (Shvetsov M-25)
::figure[src="https://upload.wikimedia.org/wikipedia/commons/4/40/Shvetsov.jpg" caption="Family tree of Shvetsov engines"] ::
| and start a new, fully-formatted line with -- |type=9-cylinder, air-cooled, radial engine |bore=155.5 mm |stroke=174.5 mm |displacement=29.876 L |length=1100 mm |diameter=1365 mm |width= |height= |weight=434 kg |valvetrain= |turbocharger= |supercharger=Single speed, single stage, geared centrifugal supercharger |fuelsystem=1 K-25 (Solex) Carburetor |fueltype= |oilsystem= |power=700 - depending on model |specpower= |compression=6.4:1 |fuelcon= |specfuelcon= |oilcon= |power/weight=
References
::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::