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Shvetsov M-25

From Wikipedia, the free encyclopedia

Soviet aircraft engine

M-25

Type	Radial engine
Manufacturer	Shvetsov
Number built	13,888
Developed from	Wright R-1820
Developed into	Shvetsov ASh-62

TheShvetsov M-25 was an aircraftradial engine produced in theSoviet Union (USSR) in the 1930s and 1940s, a licensed production variant of theWright R-1820-F3.

Design and development

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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 inPerm andKazan. There were a number of sub-variants which differed from the original M-25 in that they hadreduction gears, rather thandirect drive. Performance was similar to the equivalent Wright engines. The M-25 was later developed into theASh-62 and was later used as a pattern for the M-70. The M-70, a twin-row 18-cylinder engine, eventually developed into theASh-73 which powered theTupolev Tu-4, an unlicensed, reverse-engineered copy of theBoeing B-29 Superfortress.

Applications

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Specifications (Shvetsov M-25)

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General characteristics

Type: 9-cylinder, air-cooled,radial engine
Bore: 155.5 mm (6.122 in)
Stroke: 174.5 mm (6.870 in)
Displacement: 29.876 L (1,823.1 cu in)
Length: 1,100 mm (43.307 in)
Diameter: 1,365 mm (53.740 in)
Dry weight: 434 kg (957 lb)

Components

Supercharger: Single speed, single stage, geared centrifugal supercharger
Fuel system: 1 K-25 (Solex) Carburetor

Performance

Power output: 520–600 kW (700–800 hp) depending on model
Compression ratio: 6.4:1

References

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Wikimedia Commons has media related toShvetsov 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.

v t e Aviadvigatel, Soloviev and Shvetsovaero engines
Gas turbines	D-20 D-21 D-25 D-30 PD-14 PS-12 PS-30 PS-90 PD-18R PD-30
Radial engines	ASh-2 ASh-21 ASh-62 ASh-73 ASh-82 M-11 M-22 M-25 M-63 M-64 M-70 M-71 M-72 M-80 M-81

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