Over the years there have been many different inventors and engineers who have attempted to built vertical lift aircraft. The single main rotor with a smaller anti-torque rotor emerged as the most popular. With recent advances in technology, innovative engineers have been attempting to build a practical electric-powered helicopter. As it turns out, the single main rotor design is not the most efficient – efficiency is necessary for an electric-powered helicopter to be capable of lifting a reasonable payload. As such, engineers are designing very different vertical lift vehicles. One of these is the 2-person Volocopter and its first successful flight was November 17, 2013.
Designed and built in Germany, the Volocopter has an especially unique design. It uses 18 rotors, each powered by its own electric motor. They are mounted on a light weight carbon fiber ring above the cabin. Several on-board computers monitor and control the speed of each rotor system to achieve directional control – eliminating the need for any type of mechanical linkage. The system is designed so that if one of the motors fails (actually, several can fail at the same time) the aircraft can still safely land. Additionally, there is a ballistic parachute system for added safety.
Currently, the biggest limitation is battery life. The battery allows a flight time of 20 minutes, however, the company believes that advances in battery technology will extend the flight time in the near future. As an interim solution, the Volocopter will be built as a hybrid which will allow several hours of flight time. This is achieved by using a combustion engine to power a generator that supplies the batteries and motors with electricity.
The manufacturer, E-volo, claims the production aircraft will be extremely cost effective to operate, very quiet and easy to fly. More information can be found on their website: www.e-volo.com.