Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines
The Regular Stuff: Chat, Buy, Sell, Off Topic, etc. => General Discussion - Scale Model Gas Engines - Hit & Miss - Throttle Governed - Non-Compression – etc => Topic started by: parallelmotion on September 06, 2025, 03:36:54 pm
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That really is quite special!
I would guess that a thermal syphon would develop between the cylinder walls and the radiator. Warm water rises in the cylinder and transfers over to the upper end of the radiator, where the water then cools, and "falls" to the bottom of the radiator from which it transfers back to the bottom of the cylinder?!?!
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Thank you Raphael. Yes, that is a cast iron radiator. As I understand it the model has a cavity for water cooling but not a full water jacket. A friend says his will run for hours without water (no load).
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Bonjour,
My first passion is steam, and I also like Hit & Miss engines very much. This one is particularly exceptional in my opinion, I envy you ;)
Little question, do I see a radiator ? is it actually one? If so, how does the water circulate? I don't see any pump and the cylinder seems quite thin...
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I'm really a hot air and steam engine guy but couldn't pass this one up. It's a 1/3 scale model of a 3/4 hp inverted engine made in 1898. This new (to me) model was the 3rd example (no. 1003) sold as a finished engine by Debolt Machine in the mid-1980s, so it's now about 40 years old. It hadn't been run in decades so a little cleaning of the fuel mixer was required prior to this trial run.
https://youtu.be/PFMhY54wVG4