Solar Impulse Unveils Solar-Powered UAV

Credit: SOLAR IMPULSE
The prototype of the Solar Impulse long-duration solar-powered aircraft was unveiled last week in Duebendorf, Switzerland, near Zurich. The HB-SIA, weighing barely more than an average family car (1,600 kg./3,527 lb.) but with the wingspan of a Boeing 747-400, is intended to demonstrate the ability...

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