On April 9 the Solar Impulse 2 (HB-SIB) was unveiled during a ceremony at Payne in Switzerland in front of invited dignitaries. The aircraft was designed to complete a round-the-world flight powered entirely by sunlight. Solar Impulse 2 builds on experience gained with the first aircraft (HB-SIA, see From Switzerland to Morocco (and Back) by Sunlight, August 2012, p18) and has a wingspan of 72m (236ft) covered by 17,248 solar cells that power four electric motors. The aircraft weighs just 2,300kg (5,000lb). Solar Impulse 2 is due to fly in May, after which training flights will be conducted over Switzerland. The round-the-world trip is expected to begin in March'2015 and take three months, during which the aircraft will fly for a total of 20 days.
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机译：4月9日，在瑞士佩恩举行的颁奖典礼上，太阳动力2（HB-SIB）在受邀贵宾面前揭幕。该飞机旨在完成完全由阳光驱动的环球飞行。 Solar Impulse 2建立在第一架飞机上的经验基础之上（HB-SIA，请参见《阳光从瑞士到摩洛哥（返程）》，2012年8月，p18），机翼跨度为72m（236英尺），由17,248个太阳能电池供电，为四个飞机提供动力电动机。该飞机仅重2300千克（5,000磅）。太阳动力2号（Solar Impulse 2）将于5月飞行，此后将在瑞士进行训练飞行。环球旅行预计将于2015年3月开始，历时三个月，在此期间飞机将飞行20天。
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