Solar Impulse has completed initial tests of its prototype solar-powered aircraft, HB-SIA, after a brief first flight at Duebendorf, Switzerland, on Dec. 3. The1,600-kg. (3,527-lb.), single-pilot aircraft flew 350 meters along the runway at an altitude of about 1 meter. First tests were conducted on battery power. The 11,600-plus solar cells on the upper surfaces of HB-SIA’s 63.4-meter (208-ft.) wing, and tail will be connected after the aircraft is disassembled and relocated to Payerne Air ...

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