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Ocean crossing Solar impulse pilots prepare for worst case scenario

The Solar Impulse is about to embark on its record-breaking attempt to cross the Pacific and stay airborne for five days using only solar power. (RTS/ 

The plane flies from the eastern Chinese city of Nanjing in a 120-hour flight to Hawaii. It's the longest leg of the round-the-world trip.

The team have waited several weeks for optimal weather conditions. They need as much sunlight as possible to adequately charge the plane's solar cells in-flight.

The Solar Impulse project was launched to drum up support for clean energy initiatives, especially solar power. Its two stops in China - Chongqing and Nanjing - were aimed at raising awareness of solar projects in the world’s most populous country.

The trip began on March 9, 2015 in Abu Dhabi. During its mission, the sun-powered plane will fly for nearly 500 hours, travel 35,000 kilometres and cross two oceans and four continents.

The next leg of the journey is the most hazardous - pilot André Borschberg is flying solo and will only be taking occasional 20 minute naps. 

He and Bertrand Piccard, the alternate pilot, trained for the worst case scenario: loss of control over the Pacific.

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