Company E-volo introduced the concept of electric double-helical multikoptera 18. Payload apparatus should reach 204 kg, the maximum altitude of 2000 meters, and the speed of 100 km / h . Volocopter can without compromising safety through failure just four engines. The e-volo system controls flight direction and velocity through differential power to each rotor, eliminating the normal mechanical controls and getting the most from each miniature powerplant. Multiple small rotors also generate less noise than a more traditional vehicle. According to the developers, the project into practice may take place already in the next few years.