Hi Bob --
The two books I have that show dimensions indicate the first course behind
the smokebox is 86" and the course around the combustion chamber is 96".
It is not specified if that is over the jacketing, but I suspect not. It
also appears that all the later GS's (3-6) had the same basic boiler.
Hope this helps.
Have fun!
Bill Winans
At present I am working on a project that involes the above engine
design.
Does anyone on this list know the diameter of the SP G-6 Boiler?
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