Hi Moxis,Thank you Stephen. Yes, when running with compressed air the engine behaves almost the same. It seems that it has only two modes: Complete stillstand and full speed.
This is why I don't like very much about playing with steam, my ongoing project is an open launch with one cylinder steam engine which is powered by an electric gearmotor located hidden under the floor panels. Much easier to control the speed and behaves like a real steam engine with low speed so that you can really see the moving parts.
The engine, an early Stuart was donated to me by one of my friends who didn't have much to do with it. So I promised to build a boat for it. There will be a fake boiler installed on the gearmotor with all electronics inside:
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Lovely work, Moxis!Hi Moxis,
It is an intriguing problem with your steam engine waiting for a solution. I take it that you don't really want to fault find your steam engine, that's ok, I am happy to make suggestions if you wish.
Your open launch looks very nice, the electric motor is a good idea if you don't want to do live steam.