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Low, from aircraft design point of view, we should try to make the wings elongate, such resistance is small, easy low-speed flight and gliding. 'In order to save energy during the day and the aircraft will climb to 8500 meters altitude, the night will be at 1500 m altitude flying at low altitude. Zheng Xiangming introduction, the aircraft climb is relatively energy intensive, in terms of the solar-powered aircraft, to fly about 10,000 m too difficult 8500 m above the clouds, and easy acceptance of solar energy. Jiangsu Key laboratory of solar technology main Renchen Zhen dry professor said, 'in general, after the plane jumps over the clouds, the sun light is strong, and the height and high altitude, so the solar cell the back plate temperature will be relatively low, which is also conducive to heat the back panels, a higher conversion rate. 'Zhen-dry after years of research found that the current civilian conversion rate of solar panels generally only reach 16% -18%, but the' Solar Impulse No. 2 'using a single crystal silicon solar panels, the conversion rate is relatively higher. Number basic data [read] â–\xA0 wingspan 72 meters, exceeding the volume of the largest commercial airliner â–\xA0 weighs only 2.3 tons, and quite a family car, a less than 747 percent â–\xA0 maximum altitude of up to 8500 m â–\xA0 highest speed of 140 km â–\xA0 mounted on the wing 17248 thin, highly efficient solar panels. these panels only 135 microns thick each, the equivalent of a human hair. total battery weight of 633 kg, only the total weight of the aircraft â–\xA0 about a quarter of the fuselage and wings are made of a very light carbon fiber material. how light carbon fiber? plain paper weight per square meter is 80 grams, the same area and thickness of the carbon fiber, weighing only 25 grams â–\xA0 equipped with bathroom 3.8 square meters of single cockpit [Info] in April 2014, 'Solar Impulse No. 2' upgrade 'Solar Impulse' was unveiled, local time June 2, 2014, completed the first in 瑞士帕耶讷flying initial design and development of 'Solar Impulse' was the aircraft in April 7th, 2010 first flight, after another day and night flight, cross-border flights and intercontinental flights Red Net News Changsha, March 17 (rolling news reporter Shen Hao Zhang Ying intern correspondent Xu Hui Luo Shan) from the prohibition of cold dishes, clear and specific to certain dishes, Changsha municipal departments for campus canteen safety insurance