Shvetsov ASh-73
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The Shvetsov ASh-73 started life in 1938 from a specification for a 18-cylinder, twin-row, air-cooled, radial engine. Contrary to popular belief the ASh-73 wasn't a reverse engineered copy of the Wright R-3350, rather the ASh-73 was the product of a similar specification. Since the earlier Shvetsov M-25 engines were a licensed copy of the Wright R-1820, there were similarities and some parts were interchangeable between the R-3350 and the ASh-73. The two engines evolved from a common ancestor and from a similar requirement.
The original project designation for the ASh-73 was the M-70. The M-70 was tested in late 1938 and was a failure. The M-71 of 1940, was the successor to the M-70 and it too was a failure. The M-71 was in turn succeeded by the M-72 of early 1945, which although moderately successful wasn't placed in production. The first prototypes of the ASh-73 were built in 1945 and by the end of 1946 testing had completed successfully and the first models to enter production in 1947 lacked turbo-superchargers. Later turbo-superchargers were fitted and these were direct copies of the units used on the R-3350. The ASh-73 was produced until 1957 and 14,310 were built.
[edit] Specifications (Shvetsov ASh-73TK)
General characteristics
- Type: 18-cylinder, air-cooled, radial engine
- Bore: 155.5mm (6.12in)
- Stroke: 170mm (6.69in)
- Displacement: 58.1 Liters (3,545 cu in)
- Dry weight: 1,355kg (2,987lb)
Components
- Supercharger: Single speed, single stage, geared centrifugal supercharger
- Cooling system: Air
Performance
- Power output: 2,000/2,400hp
- Compression ratio: 6.9:1
[edit] Applications
[edit] References
- Kotelnikov, Vladimir (2005). Russian Piston Aero Engines. Crowood Press Ltd., p.130-131.
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