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Sturgeon's House

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Piston engines have been doing a good job of converting chemical energy into mechanical work for about a century and a half now, but this hasn't stopped various people from trying to seal a pressure-bearing volume that isn't cylindrical.  So far only Felix Wankel and Mazda have really pulled it off, but there will always be dreamers:





And then there's this thing, which I guess has pistons but the pistons spin in a circle:


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