Pretty cool design. It's "like a rotary/Wankel engine" but uses one area/pocket for the Otto cycle (hence 3 spark plugs at 120 deg apart), unlike a Wankel what uses 3 separate chambers for intake, combustion and exhaust as the rotor spins around, and one chamber with spark plugs dedicated for combustion. Wonder how it does on fuel, as the Wankel wasn't very fuel efficient for the power it made.