The Solar Impulse 2, a long-range experimental solar-powered aircraft with the registration HB-SIB, flies above Payerne Airport in Switzerland on Sept. 8, 2014.

The Solar Impulse 2, a long-range experimental aircraft, crashed in the Gulf of Mexico when it lost power during an unmanned test flight on May 4, a report from the National Transportation Safety Board said. There were no fatalities or injuries.

Developed by entrepreneur André Borschberg and Bertrand Piccard, a descendant of famous European explorers who pioneered scientific advancements both in the air and under the sea, the sun-powered plane has undertaken several successful test flights since it was developed in 2015. The solar-powered aircraft circumnavigated the world in 2015 and 2016.

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“The Solar Impulse........

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