Is this a good thing for green cars? Aside from the flexible fuel inputs, not really. It's not really a green engine even though the company calls it efficient. If it were, it could make a big impact. REGI U.S. says the RadMax engine is scalable for use in everything from weedtrimmers to military jet engines. The engine is also 50 percent lighter than a comparable stratified Wankel engine while producing twice or three times as much power (Mazda fans will remember the work the company did on getting the inefficient and fairly dirty Wankel engines to something resembling environmental friendliness). You can see an animated schematic of the RadMax engine in action here.
[Source: REGI U.S., Inc.]