If you’re interested, you can get a developer kit with one of the engines for $30,000. The company is working on both gas and diesel versions. How It Works The X Mini is a take on the rotary engine.

A German engineer, Felix Wankel, is credited with developing the world's first rotary engine in the 1950s. Wankel rotary engines use a triangular rotor spinning in a semi-oval case on an ...