Talk:Wright R-1820 Cyclone

Variants
Should we include the Soviet M-25 variants on this page, or do they deserve their own page... Magus732 (talk) 21:11, 4 February 2009 (UTC)


 * We already have one: Shvetsov M-25. There was a link in the "See also" section, but I've added a few more. - BillCJ (talk) 01:28, 5 February 2009 (UTC)

I presume the engine was a single bank ... the article doesn't say. "gas"; is this LNG or gasoline? — Preceding unsigned comment added by 220.244.72.216 (talk) 10:35, 16 December 2012 (UTC)

Supercharging and turbocharging
turbo supercharging applied Wright Aeronautical Engines in 1937 -

Wright Aeronautical Engines in 1937 - USA This version of the nine cylinder G Cyclone R-1820-G2, has a rating of 1000 ... More than 1000 of the 1300 engines sold were of the Wright Cyclone type, ... www.aviation-history.com/engines/wr-1937.htm - 11k - Cached - Similar pages

"The various G Cyclone models differ only with respect to the amount of supercharging applied. The G-1 has a blower gear ratio of 5.95 to 1; the G-2 a blower ratio of 7 to 1; the G-3 a blower ratio of 8.31 to 1 and the G-6 a blower ratio of 8.83 to 1. All the G Series engines are of the nine-cylinder radial aircooled type and have the following characteristics: bore, 6.125 inches; stroke, 6.875 inches; compression ratio, 6.45 to I; diameter, 54 1/4 inches; length, 43 1/4 inches; dry weight (geared) 1,163 pounds, (direct drive) 1,068 pounds."

terminology cofusion

Wdl1961 (talk) 15:29, 14 February 2009 (UTC)

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'G' and 'S' prefixes
Can we mention somewhere what the meaning of the G and S prefixes are? I'd seen the 'G' used before, and thought perhaps it was a CW term for a geared vs direct-drive version, i.e. a GR-1820 would just be an R-1820 in USAAF parlance. But I see from the list here that that can't be the case, since I doubt they were mostly direct-drive engines. As for the "S", that cannot be "supercharged", since they almost all has some sort of supercharging, and there are only a few SR models on here. And only one "SGR", and most military R-1820s were geared and supercharged, as far as I know.

Idumea47b (talk) 03:29, 9 September 2018 (UTC)


 * Actually, you're right that the G prefix is Curtiss-Wright terminology for geared versions; you see it only on their civil engines, and direct-drive versions of those engines lack the G. I think the S in their system might have stood for supercharging, but I think by the time they used that, all Cyclones were supercharged; the ones with S just had higher boost. Anyway, they seem to have dropped it at a later point. Still later they switched to a completely different designation system for their Cyclone engines.


 * The listing of variants for these engines needs to be cleaned up in general and better explained. Lots of people will just repeat U.S. military numbered-suffix designations without even checking, but those should only apply to engines built for military service (admittedly there were *lots* of those after World War II), and they aren't at all descriptive; they were just assigned in increasing order, odd numbers for Army, even for Navy, -AN-number for combined use. Civil designations tell you a bit more on the specific engine type and features: there's a big difference between a C series Wasp and an H series Wasp, or between an F-series Cyclone and a G-200 series one. --Colin Douglas Howell (talk) 20:54, 26 April 2019 (UTC)