In an effort to redefine the limits of renewable energy, a Swiss research group said their solar powered aircraft successfully completed an overnight flight Thursday thanks to its ability to store energy gathered during daylight hours.
The four-engine Solar Impulse, whose wingspan greatly exceeds its fuselage length for maximum lift, took off from Switzerland's Payerne airbase early Wednesday and returned at dawn Thursday. Pilot Andre Borschberg flew the craft to an altitude of 8,654 meters while achieving a top ground speed of 68 knots.
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