Siemens says its engineers have developed an electric motor that delivers a continuous output of about 260 kilowatts (kW) and is five times more than comparable drive systems. This new motor weighs 50 kilograms (kg) and is specifically built for use in aircraft.

The company claims the engine's power-to-weight ratio allows for larger aircraft with take-off weights up to two tons to use electric drives for the first time.

"This innovation will make it possible to build series hybrid-electric aircraft with four or more seats," says Frank Anton, head of eAircraft at Siemens Corporate Technology, the company's central research unit. “We're convinced that the use of hybrid-electric drives in regional airliners with 50 to 100 passengers is a real medium-term possibility."

Simulation techniques and lightweight construction allow the drive system to achieve a weight-to-performance ratio of 5 kW per kg. Electric motors of comparable strength that are used in industrial applications deliver less than 1 kW per kg.

Since the new motor delivers its performance at rotational speeds of 2,500 revolutions per minute, it can drive propellers directly, without the use of a transmission, says Siemens.