Diesel engines come from the U.S. and called Eco-motors OPOCE. This is a two-cylinder engine with counter-rotating pistons. The engine works on the two-stroke principle, eliminating components such as valves and camshafts. The engine has a power-weight ratio of 2kW/kg.

The engine itself can reduce fuel consumption by 30 percent. But in an intelligent way to use electrical energy during a trip in cruising speed could reduce consumption to 50 percent compared to a conventional helicopter.

Some of the weight savings are adequate to prevent transmission between the engines and rotors. Main rotor including driving motor can be tilted in the process, while the fuselage may be in the best aerodynamic position, which reduces air resistance.

At high speed tail rotor can be turned off and the handling and stability control of the tail fin and rudder.

The helicopter can land and take off both of power from the batteries alone, but for security reasons, the two diesel engines still idle. Such a take-off or landing will still be significantly quieter than today's turbine-powered helicopters.

At ILA exhibition displayed a model of Eco2avia. EADS wants in a next step, go ahead and build a prototype aircraft. The idea is that it will afford to fly with bio-diesel made from algae, which reduces the environmental impact further. At the exhibition demonstrated EADS algbransle flights with a twin-engine small aircraft.