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A little hot-cold air machine made within 2 h work. My first try, so I'm happy it just worked. Yes, it runs on top of a wood stowe. 
Razvan-Mihai Dudu's profile photoAnders Jackson's profile photoTravis Rowland's profile photodave pomerleau's profile photo
Yes, it is also known as Stirling machine. But it's easier to understand how it works if you think about it as a hot-cold air machine. ;-)
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