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Re:Wave Disk Engine Could Be 3.5 Times More Efficient Than C... by georgieporgie on Thursday March 17, 2011 @09:02PM (#2338877)
Another very interesting engine design is the Superball motor which was much hyped a few years ago, but nothing seems to have materialized:

http://www.youtube.com/watch?v=0CmGJucRDBk

Re:Wave Disk Engine Could Be 3.5 Times More Efficient Than C... by Luyt on Friday March 18, 2011 @06:50AM (#2339981)
It seems to use ceramic balls which have the same function as cranks in an Otto motor, which is probably a weak spot (much wear and tear). Otherwise the idea is elegant; an actual working prototype might be nice to see.