Talk:TsAGI A-4

Name of producer
These different forms may be due to different Cyrillic to Roman letters, though CANI is a bit hard to understand. Following the OED's table gives TsAGI. Maybe the French do/did it differently.TSRL (talk) 22:11, 1 November 2014 (UTC)
 * Altered to comply with Romanization of Russian--Petebutt (talk) 01:35, 2 November 2014 (UTC)
 * I'm happy with with that move, especially given the TsAGI page; the Romanization of Russian page is one editor's view, though, and there is a long but unresolved (no consensus) debate on its talk page.  Useful but not authoritative.  The penny finally dropped on CAHI, which is an acronyms of the English translation of the Institute's name.TSRL (talk) 19:47, 2 November 2014 (UTC)

Engine
Both sources agree it was a M-26. Aérophile adds that it had 7 cylinders and gave 300 hp. Gunston does not state either parameter but (in his engine section) says the M-26 was a Russian built Bristol Trojan (Titan??); this was a 205 hp, 5 cylinder engine. Gunston does say the A-4 had more power than its predecessor, the 2-EA and that this did have a Trojan, so the error seems to be in Gunston's M-26 = Trojan assignment. If the M-26 was a Bristol engine, it would have to be the 7 cylinder, 290 hp Neptune.TSRL (talk)
 * The M-26 was what became the Ivchenko AI-26--Petebutt (talk) 01:35, 2 November 2014 (UTC)
 * Could do with an in-line in the Ivchenko AI-26 article on this; at present we have an engine which was in production (at least ten A-4s) in 1933 but was designed in 1946!TSRL (talk) 09:25, 2 November 2014 (UTC) The AI-26 does not feature in the Ivchenko section in Gunston's engine book; the only AI-2x types there are gas turbines. He does however mention it in his slightly later Russian aircraft book (the one cited here) as "qualified 1946 at 500 hp", which is a lot more than the M-26, not recorded as connected.TSRL (talk) 09:38, 2 November 2014 (UTC)
 * MMM.. so maybe the Titan / Neptune connection might stand up--Petebutt (talk) 11:41, 3 November 2014 (UTC)
 * The M-26 (aka KIM - Kommunisticheskiy Internatsional Molodyozhi - Communist International Youth) developed by A.A. Bessonov at GAZ-24 to replace imported J-6 engines, using M-15 parts and sub-assemblies, from 1928 to February 1931 when it passed State acceptance trials. Production 1931-1933 at GAZ-24, with 446 built. Powered the Tupolev ANT-9, Stal-2 and TsAGI A-4. From:--Petebutt (talk) 06:38, 10 November 2014 (UTC)
 * The Kotelnikov book also implies that the AI-26 was developed from a later engine also designated M-26, ca.1945. Presumably not related due to differences in bore,stroke and displacement. KIM - 150/170/21.03, M-26/AI-26 - 155.5/155/20.6--Petebutt (talk) 06:58, 10 November 2014 (UTC)
 * So from the dimensions both the KIM and the AI-26 had 7 cylinders.TSRL (talk) 17:14, 10 November 2014 (UTC)