The M-25 is an aircraft engine that was produced in the USSR in the 30s and 40s under the license of Wright R-1820-F3.

The Wright R-1820 license was purchased in 1934. The Plant № 19 (Perm) was set up in order to adapt the engine. Arkady D. Shvetsov was appointed engineering director and chief design engineer of the plant.

First engines were produced of US-made parts. The only difference from the original M-25 was the use of metric components (size specification). Altogether, Perm and Kazan plants produced 13 888 M-25 engines. 

Type: radial

Volume: 29,87 l

Stroke Cycle: 174,5 mm

The Number of Cylinders: 9

Cylinder Diameter: 155,5 mm

Cooling System: air-cooled

Manufacturer: Plant № 19 (Perm), Plant № 27 (Kazan)

Manufacturer address: 1934-1942

The piston-type nine-cylinder air-cooled radial engine M-25 is a licensed production variant of the Wright R-1820-F3.

I-14, Neman R-10, Polikarpov I-15, I-15bis, Polikarpov I-153, Polikarpov I--16, DI-6, KOR-1, IP-1.