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<t>HI,<br/> <br/> -Is it possible to make a "two piston-type" Stirling engine, that <br/> would use two diaphragms instead of the pistons.<br/> <br/> -How big does the diameter of the dislplacer have to be if the <br/> cylinder has the diameter of 7.5" (coffee cup Stirling engine)?<br/> <br/> Thank ...