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Some pictures and a video to come later....
Nice pictures. Are both of them cast iron? They sure look to be. Very nice!!! As for the thread, are you looking for both stirling as well as atmospheric engines Flame Lickers)?Bill
Graham, looking at the first two photos you posted the only major difference that I can see if teh valve on the end of the model cylinder, linkages look very similar. Are there any other variations that I can't see?Must admit I like the look of the original engine, not sure if it is the shape or the bare iron that tickles my fancy I would think supporting the core(s) for the water space was quite difficult, the air passage not so bad as it can be supported at either end