Noble Gas Engine

http://peswiki.com/index.php/Top_5_Exotic_Free_Energy_Technologies

PlasmERG’s Noble Gas Engine – Nobel (inert) gas engine patterned after the Papp Engine, would cost 1/3 what a comparable output engine would cost, while its fuel would cost a few dollars per month — negligible; totally revolutionizing the renewable industry. Nine months of running time logged. Company is gearing up to go into production. (PESWiki; [updated March 22, 2011])