Originally posted by Furious
My understanding is that the ASh-82 (previosly M-82) was a short cylinder version of the M-81 and that the M-81 was a (or a derivitive of a) 14 cylinder Wright R-2600.
I know at least 2 web sites that say this as does Yefim Gordon
Well there is some disagreement about this too.......but its clear that all Shvetov's designs were spawned from Wrights technology as he held various licenses..........
below is one critique of Yifim Gordons assumption that the Ash82 was a short Wrights Cyclone.............
Opinions of
Ilya Grinberg, Erik Pilawskii
The hoary old Western myth that the Shvetsov M-82 radial was even remotely related to the Wright Cyclone is preposterous in the extreme, and unworthy of repetition by such distinguished researchers. The M-25 was indeed a license-built R-1820, but it was in production only very briefly before the considerably modified M-25A supplanted it. Further development of the M-25A and -25V resulted in the M-62 and M-63 motors, but that was basically the extent of the development of this family of aero engines. The 14 cylinder M-82 was an entirely original Shvetsov design, perhaps conceptually influenced-- as were all European 14 cylinder radials (BMW 801, Hispano-Suiza 14M, FIAT A74, etc.)-- by the French Gnome-Rhone 14B radial of 1932. Whilst the cylinder dia was identical to the R-2600 (155.5mm) if you start to look at pictures of the crank housing etc you will begin to pick up gross differences............
my view is that Shvetsov was well intol his 3rd or 4th serial engine development in the M 82 and his earlier ones were straight licensed copies........ he would of been well aware in 37 of the R-2600 and its potential.
The idea that the M 82 was a copy of the BMW just does not gel........ Shvetsov had no technology agreement with BMW.
Sorry about the hijack............. but common misconceptions were being aired
