ZURICH — Solar Impulse is well into the final assembly process of HB-SIB, the aircraft that is to fly around the world using solar power only. The aircraft is being assembled in a hangar at Dübendorf air base, near Zurich, Switzerland. Construction of the 236-ft.-span wing is well underway. The ribs and leading edge have been fitted to the massive spar. Each of its carbon fiber plies weighs just 25 grams (0.9 oz.) per square meter (10.7 ft.), the typical minimum being 90 grams per square ...


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