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Posted by Redaktion
 - Yesterday at 14:56:12
SolarStratos achieved an altitude of 9,521 metres using a double electric motor aircraft, which took advantage of warm air thermals and a lithium-ion battery to fly over the Valais Alps. The aircraft had 22 square metres of solar cells, which helped recharge the batteries.

https://www.notebookcheck.net/A-solar-powered-plane-achieves-altitude-record-in-a-5-hour-flight.1093148.0.html