Talk:Lycoming XR-7755

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Military history: Aviation / Technology / North America / United States / World War II

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Note

In personal conversation with Lycoming employees who remembered this engine, they told how the noise from a running engine destroyed the test stand and could, also, be heard for miles around.--Phyllis1753 (talk) 16:46, 17 April 2008 (UTC)[reply]

Assessment

made importance=low Accotink2 (talk) 14:38, 12 July 2010 (UTC)[reply]

Banks and rows

There seems to be a slow edit war here (maybe between completely different editors) on how to describe this engine's layout. Should be fixed one way or the other using a reliable source if only to refer here if it happens again. Radial engines are usually described by the number of rows (sets of conrods if you like) followed by the total number of cylinders. As this engine is liquid cooled the cylinders could be lined up into banks (common enough term for a line or block of cylinders) and makes it look quite unusual. There is another very similar (but much smaller engine), the Armstrong Siddeley Deerhound which is described in sources as a 'three-row, 21-cylinder' engine with no mention of the cylinder banks. Hoping that we can find an amicable solution, cheers. Nimbus (Cumulus nimbus floats by) 00:20, 21 December 2012 (UTC)[reply]

More than ten years later I see "The resulting design used nine banks of four cylinders each at a 40° angle to each adjacent cylinder" still in the article and it seems blatantly wrong to me. Surely banks in a radial 4 stroke must have an odd number of cylinders? Pictures also seem to confirm 4 rows, stacked vertically. Jan olieslagers (talk) 08:11, 25 June 2023 (UTC)[reply]

Nope, not the largest by long shot

The Lyc may well have had 36 cylinders and 7,755 cu. in. displacement, but the Soviet Yakovlev M-501 had 42 cylinders, 8.760 cu. in. and a lot more hp. The sole survivor still exists, powering a German competition tractor-pull machine. You can read all about it at the website/blog Old Machine Press.96.248.62.13 (talk) 16:29, 7 August 2018 (UTC)[reply]

The surviving engine you mention is not a Yakovlev M-501, but a heavily modified version of a marine derivative, the Zvezda M503. But your point about the "largest piston-driven aircraft engine" claim is correct. --Colin Douglas Howell (talk) 02:41, 26 October 2018 (UTC)[reply]