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Freelance 3/4” traction engine

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Team ricky:
Hi all,

Here’s an interesting project part built and re-built !!

I do want to make a traction engine but at a cost I can do !
Brought partbuilt here’s the good :

Rear wheel rims ready for spokes
Main cab all built minus a water tank
Boiler parts individually ok
Parts made so far are scale
Several valves were made to a good standard

Bad bits :

The boiler was lashed up with soft solder and the front of the throat plate was slot milled to clear the horn plates and was very dangerous indeed….

No plans or drawings

No engine castings No n this scale available

So the way I’m tackling this is to come up with a sensible spec, stick to it , discard any bad bits and do over!

Silver solder the boiler

My spec as I see it going in is:

3/4” scale parts only
Engine casting set is from a Revees Trojan
Silver soldered boiler
Gas or meths (I thought about coal )
Engine reverse gear
Simple 1 speed gears with a neutral setting
Traditional crank and rods
Water pump (either axle or manual


I think so far I’m on the right track…

I have fully stripped the boiler and removed all traces of soft solder (big job)
And silver soldered the bushes back in and fire hole , Hopefully more pics soon ;)

propforward:
Heck of a project - look forward to seeing it take shape. Sounds like a readonable recovery plan - would be wise to cross reference the boiler to an established design, or else go through the design against a model boiler design reference and check to make sure it’s up to the task. Not knowing your background I don’t know how comfortable you are with either approach. Assuming you are in the UK it would be wise to engage the help of a model engineering club before you go far, as I think you’ll need to have it inspected in some manner if you wish to show it.

Jasonb:
Rather than a freelance the tender/hornplates you show suggest it is built to or very closely base on the design "Modular" that was published in Model Engineer Magazine in the early 80s

With the cylinder, valve gear and crank on it's own platform it could be removed from the traction engine and used as a stand alone steam engine hence the name "Modular"

Team ricky:
Small world !!

Yes I think you are onto something there…. The give away is the two entrance cut outs and the steam turret design… both features I have matching the one picture on the net !


I wonder what overall design/type I should go for ? Manufacturer’s?

I’m pretty sure I’m just going off piste with this one and probably will enjoy that alot more than hunting/following drawings- Famous last words !

I did forget to picture the smoke box end and chimney as they are complete

Team ricky:
As for the boiler …..

A drawing for that would go a long way , However I’m pretty confident it’s to a general design up to this point and research and books I’ve brought pretty much show the overall design is sound just the soldering was terrible!!

The boiler design is a wet back front sides like a larger scale would be, Therfore stays will added which are not drilled for yet as you would expect, the doubler I’ve added allows for the fire box sides to be extended as normal- this will get fixture rivets for soldering.. I also extended the doubler to fix the mill slot a rank amateur did , Very dangerous as it was ….

I’m going for 80psi test and 30 psi on the relief valve , If it fails I’ll do what’s needed to fix or make a new one which isn’t too tricky looking at the build so far..

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