Jubilee boiler 3.5 gauge

Hi guys

Does anybody know if it is possible to change the tapered

section of the boiler for a parallel section using standard

tube. If so any advice on the diameter or if any other measurements will need changing..

You could use tube the size of the small, smokebox end of the boiler and use the cladding to give the tapered appearance. I know builders who make round top boilers instead of Belpaire, and construct the firebox shape with the cladding.

Greetings Derek, if you examine the old Model Engineer mags with the original articles, you will find that Martin Evans designed a parallel boiler version of this design, which would of course be correct for the earlier Fowler version of the locomotive. The Fowler parallel boiler design is to be found on page 561 of the 7th May 1959 edition of ME. Martin also produced a 5 inch gauge tapered boiler design a little later.

May I suggest that if you do go ahead with building the boiler, you use a single superheater boiler tube rather than 3 as originally designed, and use a full length of the firebox stainless radient superheater . This modification was also was drawn by Martin a little while later, but I would not bother with the thermic syphon shown on the same drawing. This advice was given to me by Martin himself when I discussed my build with him.

These designs make a fine locomotive, many examples are to be seen performing well, but I cannot remember a Fowler version, so you could have a first.

Regards

Brian B

There was never a Fowler version of the Jubilee class. They were a new build with taper boiler, by Stanier. I think you are confusing the Jubilee class with the Royal Scots which were rebuilt from straight (Fowler) boilers to taper boilers by Stanier.

Andrew.

Edited By Andrew Tinsley on 01/09/2023 11:05:08

I think the OP is referring to the design by Martin Evans for a Stanier 2-6-4T, which he named Jubilee.

Edited By Redsetter on 01/09/2023 11:38:57

Thanks Redsetter, all is now clear! Yes indeed there were two versions of the LMS tank one with straight boiler (Fowler) and the Stanier derivative with the later taper boiler.

Martin Evans certainly confused me!

Regards,

Andrew.