containing this video:
Norbert Mueller describes his wave disk generator:

According to Norbert Mueller this new engine saves 3.5 times energy consumption in hybrid vehicles.

"Michigan State University associate professor of mechanical engineering Norbert Mueller describes his Wave Disk Generator, for which he has received a $2.5 million grant from the U.S. Department of Energy to build a prototype new engine and generator technology that can dramatically improve efficiencies and reduce costs of electric hybrid vehicles."