Thu Dec 03, 2009 2:41 pm
Thu Dec 03, 2009 7:25 pm

Thu Dec 03, 2009 7:49 pm
Thu Dec 03, 2009 7:51 pm
Thu Dec 03, 2009 8:11 pm
Fri Dec 04, 2009 12:44 am
Fri Dec 04, 2009 1:37 am
John Dupre wrote:They look suspiscously like early B-29 props....
Fri Dec 04, 2009 2:22 am
Fri Dec 04, 2009 3:09 am
tom d. friedman wrote:with the russkies selling off their country, artifacts, & crown jewels etc, i bet that spaghetti strainer flying boat goes for cheap cheapski!!
The Shvetsov ASh-73 ultimately began in 1938 from a specification for a 18-cylinder, twin-row, development of the Shvetsov M-25, a license-built 9-cylinder, air-cooled, radial Wright R-1820-F3 Cyclone engine. Development continued through a series of less than successful engines, before culminating in the ASh-73. Contrary to popular belief the ASh-73 wasn't a reverse engineered copy of the Wright R-3350: "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)." [1] rather the ASh-73 was the product of a similar specification. Since the earlier 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 to a similar requirement.