Jan Ridders recently updated his plans for a vertical flame eater engine that he originally made in 2003 as a birthday present for his son Marc. He made a number of improvements and redrew the plans using a CAD program. Jan says this engine is “more forceful and noisy” than his Stirling engine models.
This is just one of about two dozen beautiful engines Jan has designed. You can see them all by visiting his web site, which is in both English and Dutch (look for the buttons to change the language). Jan gives his plans away for free, although he will accept a donation if you’d like to make one. You just have to send him an email telling him which plans you would like. You can contact him via his web site.