The RotorSport Calidus is a tandem two-seat aircraft, designed in Germany 3 years ago as a comfortable touring machine. It was certified by CAA in UK Jan 2011 and over 1000 have been sold Worldwide. Autogyros may look like helicopters, they are different. They use unpowered rotors to generate lift, with a propeller driven by an engine (like a light aircraft) produces thrust. The airflow over the rotors causes them to spin, a lot like a windmill.