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The Shvetsov ASh-21 is a seven-cylinder single-row air-cooled radial aero engine.
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 as well. 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)
- Type: 7-cylinder, air-cooled, single-row, radial engine
- Bore: 155.5mm (6.12in)
- Stroke: 155mm (6.10in)
- Displacement: 20.6 Liters (1,257 cu in)
- Dry weight: 487kg (1,074lb)
- Supercharger: Single stage, single speed, geared centrifugal supercharger
- Fuel system: Carburetor
- Cooling system: Air
- Power output:
- 520 kW (700 hp) at 2,300 rpm takeoff power
- 459 kW (615 hp) at 1,700 m (5,580 ft)
- Specific power: 25.5 kW/L (0.56 hp/in³)
- Compression ratio: 6.4:1
- Power-to-weight ratio: 1.07 kW/kg (0.65 hp/lb)
- 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.