Hydrogen fuel in the venerable Wankel rotary engine powers to Mazda demonstrators as an alternative strategy to using clean fuel without the expense and complexity of fuel cells. The RX8 sports car uses hydrogen Wankel to drive wells while MX5 minivan is a series hybrid electric with the Wankel generating electricity for electric drive motors.
Background
Mazda is small Japanese affiliate of Ford Motor Co
Wankel engine is small, simple and lightweight
Never lived up to its initial expectations