Images: Rotary engine promises clean burn

Reg Technologies is building a lightweight, clean-burning new engine technology capable of running on fuels ranging from diesel to hydrogen. The rotary design is said to be significantly smaller than a typical piston engine. It replaces the reciprocating motion of the piston with a single rotor that moves around an oval chamber.

This picture shows Reg Technologies' latest model, the RadMax (left), alongside a piston engine.