Hi Raphael,
Now that is a proper model paddle steamer! Tanwen was built to test some model steam engines I was working on, they were to be compact to be used in a small class of boat Mini something? Any way less than 500 mm which Tanwen is, just! It is based on a type of Australian boat. It is fitted with a single cylinder engine. I did design and make a twin but never got around to fitting it. Attached a couple of photographs you might find interesting.
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Maybe if we get to Paris again I will fit it in place of the single cylinder engine in Tanwen.
Take care stay safe.
Tony.