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<t>So in order to get a large enough temperature variance, the hot cyclinder would need to go far enough in the ground to find a sufficient source of heat? Seems like it may work but that would be pretty big.<br/> <br/> I have another idea about a single cylinder focused windmill type engine (more l...

<t>Something I have been thinging about for quite some time now is the <br/> possibility of building a two cyclinder Stirling type engine that <br/> uses the above ground atmosphere to provide the warm temperature for <br/> one cyclinder and then bury the other cylinder far enough into the <br/> ear...