Solar Impulse 2 Unveiled

With a mission to circumnavigate the earth in 2015, the Solar Impulse 2 unveiled on 9 April in Payerne, Switzerland. The craft has a wingspan of 72m, which is even wider than the one of Boeing 747; but it weighs much lighter and can reach a top speed of 140km per hour. Covered by more than 17,000 solar cells on the wings, it is designed to use only solar energy for all electricity uses, even allow one pilot to spend five days in the cockpit.

The Solar Impulse 1 has proved its capability of flying with power gained only from sunlights in 2013 when it flew from West coast to East coast in the United States. Bertrand Piccard and Andre Borschberg, both founders and pilots, will find a sustainable way to operate their around-the-worid flight not only for the plane but also for the pilots, in terms of being five days in the air.

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