Solar Impulse II. Around the world with a solar airplane.

[Yiannis_B]

«Imagine energy reserves increasing during flight! To make this dream a reality, we had to make maximum use of every single watt supplied by the sun, and store it in our batteries. We tracked down every possible source of energy efficiency. Today, Solar Impulse is the first solar airplane flying through night and day, the first aircraft to come close to perpetual flight» André Borschberg.
http://www.solarimpulse.com/en/our-...ure&utm_campaign=tech-challenges#.VCGOppSSxV4

http://en.wikipedia.org/wiki/Solar_Impulse