Switzerland’s Solar Impulse has unveiled the aircraft with which it will attempt a solar-powered round-the-world flight in 2015.   The 236-ft. wingspan Solar Impulse is scheduled to make its first flight in mid-May.   The aircraft, registered HB-SIB, is larger and heavier than the prototype, HB-SIA, with increased wingspan, solar-cell area and battery capacity. Solar Impulse 2 will have increased endurance and speed, giving it a greater ability to manage weather ...

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