Talk:Dobrynin VD-4K

Military history: Aviation / Technology / Russian & Soviet / Cold War C‑class

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Aviation: Engines

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Compound?[edit]

Article currently reads in part The Dobrynin VD-4K was a Soviet six-bank, 24-cylinder, turbo-compound, inline engine developed after the end of World War II. (my emphasis)

But the diagram in the infobox appears to me to be a non-compound, turbo charged engine.

Andy Dingley, I see you're active, and you've been a good source of information on this sort of distinction in the past (I admit it), any comments? Andrewa (talk) 22:31, 5 July 2019 (UTC)[reply]

So what's the issue? The turbo compounding is similar to (possibly copied from) the Wright R-3350, with three power-recovery turbines mounted near the banks. Like the R-3350, there's also a mechanical supercharger at the rear of the crankcase. The difference is that there's an additional separately-mounted turbosupercharger (like several of the R-1820 models). Bigger and more complex than the comparable US radials, but not out of line as a post-war evolution to produce an intercontinental bomber. This engine was only ever intended for the Tu-85. Andy Dingley (talk) 22:58, 5 July 2019 (UTC)[reply]

Thanks, and you seem to be right, in that there's a label on the PRT cooling air. And there's an intercooler (unlabelled). So I guess the PRTs are there, just not shown in the diagram. Andrewa (talk) 03:45, 6 July 2019 (UTC)[reply]