Roundhouse Taliesin cylinder design

[JMORG]

Hi all,
I am currently embarking on a project to build Moel Tryfan for my apprenticeship project!
I'm initially designing everything first before I cut metal, but I am stuck on cylinders and (especially) valve chests.
I don't own a Taliesin but does anybody have any pictures on the valve chests (it maybe worth noting that the locomotive will be slip-eccentric, so much simpler!)?
Thank you!

[TonyW]

Any use?

[steamie1]

Nice to think of a single Fairlie restored programme underway Jmorg, good luck and do keep us mortals posted. I had a years apprenticeship at Rolls Royce and it was the best part of my working life, although I did not realise at the time. See it through and savour it whilst you are young.  

I was pleased to see inside the frames of Taliesin Tony. This is on my want list but I may have to keep it a dream for now finances being low right now. It's amazing to see the tiny watch like workings. I have Charles with the same workings only bigger. This intricate work is a joy to see especially when it works so well. Is she a favourite model old Tali? Does she run well slow by the way?  Having big wheels makes me wonder that's all. Is the steam supply pipe plastic and flexible to allow the frames to pivot?

[TonyW]

Is she a favourite model old Tali?

Sorry, not my loco! It was here for repairs a couple of months ago.

[GTB]

I'm initially designing everything first before I cut metal, but I am stuck on cylinders and (especially) valve chests.

Have a look at the drawings for Dave Watkins Wild Rose III design. It has the same arrangement of outside cylinders with inside valves and slip eccentrics.

http://www.davewatkins.pwp.blueyonder.c ... wings.html

Graeme

[JMORG]

Thanks for all the positive responses everyone!
I remember reading on the 16mm model of the month page about a scratch built taliesin that had a common valve chest? I'm struggling to understand how an arrangement would actually work?!? :S

[GTB]

I remember reading on the 16mm model of the month page about a scratch built taliesin that had a common valve chest? I'm struggling to understand how an arrangement would actually work?!?

Fairly common with models of inside cylinder locos., with a single valve chest above or below the cylinders. Not sure why you'd bother though with outside cylinders and inside slide valves.

Using the principle that a picture is worth a thousand words, Greenly's book has examples illustrated in the various editions. If you don't have access to a copy of the last edition, or it's reprints, there's a downloadable copy of the first edition online here.

https://archive.org/details/modellocomotive00greegoog

Graeme

[TonyW]

I remember reading on the 16mm model of the month page about a scratch built taliesin that had a common valve chest?

The Roundhouse Taliesin has a single valve chest containing two slide valves.

[JMORG]

Ah, I think I understand it now, the centre of the valve chest is the exhaust, so the spent steam will obviously try and escape through there...

[laalratty]

The exhaust on a Roundhouse Taliesin is from the centre valve chest, through a pipe that takes it from the bottom and between the valve spindles and up to the chimney. The pipe is held onto the chest by a small screw, this came loose on my uncles one which an amount of exhaust to leak, which did look rather prototypical although it did make the loco sound somewhat sick.