Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines
The Regular Stuff: Chat, Buy, Sell, Off Topic, etc. => General Discussion - Model & Toy Steam Engines – Stirling Cycle – Flame Lickers – Small Antique Originals => Topic started by: Jim on November 20, 2025, 11:03:22 pm
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Bonjour,
For this kind of boats the pressure can go up to 80 bar / 1160 PSI ! But keep in mind that there is no boiler as flash steam is just giving the pressure at the end of the steam pipe.
120 mph / 198 km/f for this example (not one of my videos ;) ):
https://www.youtube.com/watch?v=g259PIB4nFc
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Wow 1,000 PSI now that's a dangerous thought!!!
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This is a typical design for high speed single acting steam engines.
Most of these were used in model boats and some from Stuart Turner
were used in small field generators by the military.
Stuart made a lot of different models with the same basic design.
Jim I suspect that as stout as that is that it was purpose built for a good sized model tether boat.
Tether boat engines are mostly single or twin cylinder however H.E. Boucher made 4 cylinder engines as did a few other makers.
High speed tether boats operate at up to 1,000 psi.
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Jim,
Your engine looks very similar to this one I found: https://www.worthpoint.com/worthopedia/stuart-turner-motor-torpedo-boat-mtb-250440021
It's used for models of 1920's era motor torpedo boats. I need to get to bed and get to work, so I don't have time to dig deeper.
What do you think?
Paul
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It's a weird one....but folks wanted it, I was surprised how many bids it received.
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It's built awfully heavy for a model, like it's expected to get abuse or heavy vibration. I wonder if it's an appliance off of a full size locomotive or ship engine?
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Similar to small steam engines patented by George Westinghouse.
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My first thought is that it may have originally been intended as a compressor!
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What's peoples thoughts on this 'steam engine'?
https://www.ebay.com.au/itm/286925122253?