The Shvetsov M-25 was an aircraft

radial engine The radial engine is a reciprocating engine, reciprocating type internal combustion engine, internal combustion engine configuration in which the cylinder (engine), cylinders "radiate" outward from a central crankcase like the spokes of a wheel. ...

produced in the

Soviet Union The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...

(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 Perm or PERM may refer to: Places * Perm, Russia, a city in Russia **Permsky District, the district **Perm Krai, a federal subject of Russia since 2005 **Perm Oblast, a former federal subject of Russia 1938–2005 ** Perm Governorate, an administr ...

and

Kazan Kazan; , IPA: Help:IPA/Tatar, ɑzanis the largest city and capital city, capital of Tatarstan, Russia. The city lies at the confluence of the Volga and the Kazanka (river), Kazanka Rivers, covering an area of , with a population of over 1. ...

. There were a number of sub-variants which differed from the original M-25 in that they had

reduction gear A gear train or gear set is a machine element of a mechanical system formed by mounting two or more gears on a frame such that the teeth of the gears engage. Gear teeth are designed to ensure the pitch circles of engaging gears roll on each oth ...

s, rather than

direct drive A direct-drive mechanism is a mechanism design where the force or torque from a prime mover is transmitted directly to the effector device (such as the drive wheels of a vehicle) without involving any intermediate couplings such as a gear train ...

. 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 The Tupolev Tu-4 (; NATO reporting name: Bull) is a piston-engined Soviet Union, Soviet strategic bomber that served the Soviet Air Force from the late 1940s to the mid-1960s. The aircraft was a copy of the American Boeing B-29 Superfortress, ha ...

, an unlicensed, reverse-engineered copy of the

Boeing B-29 Superfortress The Boeing B-29 Superfortress is a retired American four-engined propeller-driven heavy bomber, designed by Boeing and flown primarily by the United States during World War II and the Korean War. Named in allusion to its predecessor, the Bo ...

Applications

* Gotha Go 244 *

Kharkiv KhAI-5 The Kharkiv KhAI-5, (sometimes Neman R-10) was a Soviet reconnaissance and light bomber aircraft, designed in the mid-1930s in the Kharkiv Aviation Institute (KhAI, - in Ukrainian: ХАІ), under the direction of Iosif Grigorevich Nyeman (someti ...

bis *

Tupolev I-14 The Tupolev I-14 (also designated ANT-31) was a Soviet fighter aircraft of the 1930s. It was a single-engined, single-seat monoplane with retractable undercarriage, designed to carry heavy armament, and as such was one of the most advanced fighter ...

Polikarpov I-15 The Polikarpov I-15 () was a Soviet biplane fighter aircraft of the 1930s. Nicknamed ''Chaika'' (', "gull") because of its gulled upper wings,Gunston 1995, p. 299.Green and Swanborough 1979, p. 10. it was operated in large numbers by the Soviet ...

bis *

Polikarpov I-153 The Polikarpov I-153 ''Chaika'' () is a late 1930s Soviet sesquiplane fighter. Developed from the I-15 with a retractable undercarriage, the I-153 fought in the Soviet-Japanese combats in Mongolia and was one of the major Soviet fighter types ...

Polikarpov I-16 The Polikarpov I-16 () is a Soviet single-engine single-seat fighter aircraft of revolutionary design; it is a low-wing cantilever monoplane fighter with retractable landing gear, and the first such aircraft to attain operational status. It "in ...

Specifications (Shvetsov M-25)

References

* * {{Soviet Union–United States relations, state=collapsed 1930s aircraft piston engines Aircraft air-cooled radial piston engines Shvetsov aircraft engines Soviet Union–United States relations

Design and development

Applications

Specifications (Shvetsov M-25)

See also

References