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Shvetsov ASh-73
The Shvetsov ASh-73 is an 18-cylinder, air-cooled, radial aircraft engine produced between 1947 and 1957 in the Soviet Union.
Contents
Design and development
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,[1] 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.[2]
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.
Applications
- Beriev Be-6
- Ilyushin Il-18 (1946 Prototype)
- Tupolev Tu-4
- Tupolev Tu-70
Specifications (Shvetsov ASh-73TK)
References
Notes
- ↑ “There was no need to copy the Wright R-3350-23A; the engine that was put into production was the indigenous ASh-73TK - a further development of the M-71 and M-72, which differed in being fitted with twin TK-19 turbosuperchargers (TK = toorbokompressor).” Yefim Gordon, Vladimir Rigmant (2002). Tupolev Tu-4, Soviet Superfortress (Red Star, Vol.7). Midland Publishing ISBN 1-85780-142-3. pp. p. 21
- ↑ “In the late 1930s and the early 1940s OKB-19 evolved two 18-cylinder two-row radials - the 2,000-hp M-71 and the 2,250-hp M-72 - which were similar in their design features and production techniques to the Wright Twin Cyclone engines powering the B-29” Yefim Gordon, Vladimir Rigmant (2002). Tupolev Tu-4, Soviet Superfortress (Red Star, Vol.7). Midland Publishing ISBN 1-85780-142-3. pp. p. 21
Bibliography
- Kotelnikov, Vladimir (2005). Russian Piston Aero Engines. Crowood Press Ltd., p.130-131.
- Yefim Gordon, Vladimir Rigmant (2002). Tupolev Tu-4, Soviet Superfortress (Red Star, Vol.7). Midland Publishing ISBN 1-85780-142-3, p.22-25, 63-64, 91.
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| This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Shvetsov ASh-73". |
