Siemens fully integrated drive system makes electric aircraft a reality

At the Paris Air Show, Siemens, Diamond Aircraft, and EADS made a significant announcement with the successful debut of the second-generation DA36 E-Star 2, a tandem hybrid aircraft. This marked a major step forward in the development of electric propulsion systems for aviation. The aircraft completed its first flight on June 1, 2013, at the new Vienna Airport, flying for one hour and showcasing the potential of hybrid technology in commercial aviation. The DA36 E-Star 2 features a fully integrated drive system developed by Siemens, which is both flexible and scalable. It's designed to support aircraft with up to 100 passengers, making it a promising solution for future commercial operations. Compared to the previous model from 2011, this version is more advanced, with a reduced weight of approximately 100 kg, while also improving efficiency and performance. One of the key advantages of the system is its ability to significantly cut fuel consumption and emissions—by around 25%—while enabling quieter takeoffs. The propulsion system includes a Siemens motor, power electronics, and a gearbox, all integrated into a compact unit weighing just 13 kg. This system delivers 80 kW during takeoff and 65 kW continuously, offering a power-to-weight ratio of 5 kW/kg—twice as powerful as the first prototype and six times that of a standard industrial motor. During flight, the aircraft can draw energy from its battery, and once in cruise mode, the battery is recharged using the Austro Engine Wankel generator. The battery was developed by EADS’ Innovation Workshop, highlighting the collaborative effort behind this project. Ralf-Michael Franke, CEO of Siemens AG’s Industrial Business and Domain Drive Technology Group, emphasized that this technology could soon be adapted for small aircraft and eventually scaled up for commercial use. He noted that the fully integrated drive concept not only represents a technological milestone but also showcases the versatility of such systems across various industries. In addition to the technical achievements, the three companies also announced a joint commitment to further develop hybrid electric technologies, signaling a strong partnership in the future of sustainable aviation. The DA36 E-Star 2’s success demonstrates that hybrid electric propulsion is no longer just a concept—it's a viable path toward greener skies.

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