A true novelty engine with its slow cycle of revolutions, like watching the waves come in or clouds pass by, The Stirling marble engines of the Beta type are usually geared down to maintain constant flywheel motion. They run on low fuel use and as the cylinder dips into and out of the flame here, ordinary glass marbles should not overheat and crack. An easy build with minor machining and mostly purchased parts, marble Stirling can be a good introduction for beginners to dynamic engine modeling! [ame]http://www.youtube.com/watch?v=Ehmt11-YEmo[/ame]
