Supporting > Vehicles & Models

Freelance 3/4” traction engine

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propforward:
Good deal. Hope to see pics of it at some point. 👍👍

Jasonb:
General arrangement and boiler.

There is mention of testing to 150psi so that would suggest a working pressure of 75psi.

Team ricky:
Brilliant find thanks !!

Looks like the same design as my parts would suggest ;)

16g copper throughout

Same fire box design

Only big question I have is it shows no stays….
Would not be detrimental to add and at those pressures mad not to …!

I’m definitely not going over 100 psi test 40 psi WP , that’s a good amount of power especially with the low gearing traction engines run !

Team ricky:
A little soldier done ✅

I made up the crown sheet and soldered the tubes to the fire box and the front half of the crown sheet,

All went well but borderline on heat so I’ve ordered a 30 jet torch to finish the boiler ,

Offering up the parts inside the shell it all looks good and on drawing, To finish the fire box I will solder inside joints too just before soldering the fire box in the shell!

One other feature missing is the crown sheet gussets….. I don’t think it’s necessary but maybe at the higher pressures mentioned…

Jasonb:
I think as the crown is arched rather than flat you should be OK without staying that.

Text does mention that it is about on the borderline for needing stays to the firebox but designer felt that provided you stuck with 16swg it was OK.

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