Shvetsov ASh-21

The Shvetsov ASh-21 is a seven-cylinder single-row air-cooled radial aero engine.

Type Radial engine
Manufacturer Shvetsov OKB-19 in Perm'
First run 1945
Number built 7,636
Developed from Shvetsov ASh-82

Design and development

The ASh-21 is basically a single-row version of the Shvetsov ASh-82. The ASh-21 also incorporates a number of parts from the ASh-62 radial engine. Design began in 1945, and by 1947 testing had finished and production had begun. Between 1947 and 1955 7,636 ASh-21 engines had been built in the USSR and beginning in 1952 it was produced in Czechoslovakia as the M-21.


Specifications (Shvetsov ASh-21)

General characteristics

  • Type: Seven-cylinder, air-cooled, single-row, radial engine
  • Bore: 155.5 mm (6.12 in)
  • Stroke: 155 mm (6.10 in)
  • Displacement: 20.6 L (1,257 cu in)
  • Dry weight: 487 kg (1,074 lb)


  • Supercharger: Single stage, single speed, geared centrifugal supercharger
  • Fuel system: Carburetor
  • Cooling system: Air


See also

Comparable engines

Related lists


  • 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.
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