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Forgive me if this has been discussed before. I have Quinn's boiler calculator which I am using to plan a design for a 6" boiler. I do have a professional set of plans for a 6" that states 55 tubes, I'm not sure of the diameter at the moment, I'm going to guess at 1/4"-3/8". Using Quinn's...

Hi, Ray here from Ontario, Canada, I've been a model builder for a year or so. My first build was a PM Research Steam Engine #3, I enjoyed that so much I wanted something more challenging so I built a PM Research #4. This taxed the limits of my Mini lathe and mini mill but with the help of...