Talk:Wright R-1820 Cyclone

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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)[reply]

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)[reply]

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)[reply]

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)[reply]

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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)[reply]

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)[reply]