Did I hear you say "model steam engine run on air pressure"? Those, along with atmospheric and Stirling engines, have been my hobby for quite a while. Although I've built a boiler works, it's far more convenient (and safer) to run them with an airbrush compressor. Here are a couple of samples of my work...
They are all very nice works of art Marv. The rope drive is very impressive, never seen anything like it before and of course the
"toilet steam engine". That is quite unique. If it were mounted on bearings at each end I think it would get to a very high rpm.
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