DLR’s high-altitude platform HAP-alpha has completed its first flight at the Cochstedt test centre in eastern Germany, beginning flight testing of the 27-metre-wing-span aircraft designed for missions in the lower stratosphere. The 138-kilogram platform stayed airborne for about 70 minutes and climbed to around 180 metres during the initial low-altitude test, a first step toward future operations at altitudes of up to 20 kilometres.
HAP-alpha is being developed as a flying testbed for Earth-observation and communications technologies under real conditions. Planned payloads include a high-resolution camera system and synthetic-aperture radar, allowing engineers to validate sensors and data links in an aircraft that can operate above conventional aviation traffic. The project is positioned as a flexible experimental platform rather than a commercial aircraft programme, with the emphasis on proving systems for later use in stratospheric missions.
The first flight keeps the programme on track for more demanding trials after the low-altitude checkout phase. Higher-altitude work will focus on the aircraft’s endurance, control and payload integration in the thin air of the lower stratosphere, where such platforms are expected to support remote sensing and communications experiments.