8 A network of German research labs is developing a UAV that combines an eVTOL with a glider (writes Nick Flaherty). The Albacopter project, led by Fraunhofer IVI, is an airborne experimental platform for testing and demonstrating flights that combines the VTOL capabilities of multi-copters with the aerodynamic advantages of gliders to extend the operating range. The €8 million project includes researchers from six Fraunhofer institutes working across mobility, materials science, energy and propulsion engineering and mechatronics, as well as sensor, communication and automation technologies, machine learning and production engineering. Two Songbird 150 UAVs from manufacturer Germandrones were bought as part of the project to test and validate innovative attitude control systems, autopilots, sensors and energy management systems. The VTOLcapable aircraft has a wingspan of 3 m and can carry a payload of up to 4 kg. A Lidar photo detector developed by the Fraunhofer Institute for Microelectronic Circuits and Systems is being used in the project that can detect individual photons of light. The project is specifically designed to replace sensors with newer generations of technology. The project is also developing a novel drive system with higher performance than direct-drive systems. It uses a highspeed synchronous machine combined with a multi-level spur gear unit. “We are in the end stages of the conceptual phase and will soon begin building the drive unit,” said Dr Lars Fredrik Berg, project manager for energy storage systems and drive engineering at the Fraunhofer Institute for Chemical Technology. “In addition to developing the drive, the researchers are also designing a stand for testing the eVTOL drive systems to up to 450 kW.” Airborne vehicles eVTOL-glider UAV plan Platform one December/January 2024 | Uncrewed Systems Technology The motor system proposed for the Albacopter project
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