It looks like CORSAIR was described by Westbury starting in Model Engineer volume 132 (1966), in the series ‘Single-Acting Steam Engines’.
Part#6 of the series (ME issue 3299, 17th June), seems to confirm Jason’s suspicions.

I’ve attached a couple of images which I hope are sufficiently cropped to avoid copyright problems!

Clem

Never heard of Hiduminium before (so much for a degree in material science! ).
https://en.wikipedia.org/wiki/Hiduminium

I wonder if any of our ME related suppliers at the time of the original design were offering it and ETW was using the term LH generally in conversations with fellow machinists.

The nearest to Dural is 2024 but that is not easy to get hold of in small amounts but the 2014 that I suggested earlier is stocked by quite a few of the ME suppliers though some may still list it as HE15. which is another copper containing alloy, it so often used for conrods in model engines (IC and high speed Steam)that don’t have room for bearing shells such as this engine

Once linked up to a flash steam boiler and doing several thousand rpm a lesser alloy may start to streatch and you will get an oval big end.

High Duty Alloys Redditch factory was still operating as Mettis Aerospace around 2017 when we moved away.

I’d heard of Hiduminium but wasn’t aware of the connection, or the other sites.

Thanks for the snippet of industrial history.