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Solar Impulse lands in Hawaii, completing historic flight
By Eugene Tanner
Kapolei, United States (AFP) July 3, 2015

The Solar Impulse 2 aircraft completed a historic flight in its quest to circle the globe without consuming a drop of fuel, touching down gracefully in Hawaii on Friday after the most arduous leg of its journey.

The sun-powered plane, piloted by veteran Swiss aviator Andre Borschberg, took 118 hours -- about five days -- to make the voyage from Japan to Hawaii and landed shortly after dawn at Kalaeloa Airport on the main Hawaiian island of Oahu.

"Just landed in #Hawaii with @solarimpulse! For @bertrandpiccard and I, it's a dream coming true," Borschberg tweeted triumphantly after completing the most perilous part of the around-the-world odyssey.

Borschberg and Bertrand Piccard have been alternating the long solo flights and Japan to Hawaii -- where it was Borschberg in sole control -- was the eighth of 13 legs.

"Difficult to believe what I see: #Si2 in Hawaii! But I never had doubts that @andreborschberg could make it!" tag-team copilot Piccard wrote on Twitter.

"This flight to Hawaii is not only an aviation historic first, but also a historic first for energy and cleantechs."

The experimental plane landed a little after 1600 GMT, and Borschberg, all smiles, emerged a short time later from the cockpit, later adorning a traditional Hawaiian flower lei and holding a celebratory bottle of champagne.

Sunlight glimmered on the horizon as the Solar Impulse ground crew burst into cheers and applause upon completion of the groundbreaking flight.

The 4,000-mile leg (6,500 kilometers) from Nagoya, Japan to Hawaii was not only the world's longest solar-powered flight both in terms of flying time and distance, it also set the record for longest solo flight by time.

The whole trip from Japan to Hawaii took four days and 22 hours, with the Swiss aviator taking catnaps of only 20 minutes at a time to maintain control of the pioneering plane.

Borschberg easily beat the previous longest solo endurance flight, by Steve Fossett, who flew for 76 hours and 45 minutes in 2006 in the Virgin Atlantic GlobalFlyer.

Fellow pioneering aviator and Virgin Group founder Richard Branson tweeted his congratulations to Borschberg and his team.

"Congrats @SolarImpulse, beating @Virgin GlobalFlyer record non-stop solo flight without refuelling. Huge step forward," Branson wrote.

- Yoga in the sky -

The flight tested its exhausted pilot to the maximum, in what his team described as "difficult" conditions.

Traveling at altitudes of more than 9,000 meters (29,500 feet), Borschberg at times had to use oxygen tanks to breathe and experienced huge swings in temperature throughout.

Alone throughout the entire flight and utterly self-reliant in the unpressurized cockpit, Borschberg was equipped with a parachute and life raft, in case he needed to ditch in the Pacific.

Mission organizers described the journey as having taken "pilot and aircraft to the limits" of their endurance.

Borschberg, born in Zurich, is no stranger to adventure -- 15 years ago, he narrowly escaped an avalanche, and then in 2013 he was involved in a helicopter crash that left him with minor injuries.

The pilot, who is also a yoga enthusiast, has worked as an army pilot and supervised the construction of the first Solar Impulse plane.

In 2010, for the first time in history, he flew 26 hours straight using only solar energy.

Borschberg didn't let the tiny cockpit of the Solar Impulse 2 plane stop him from practising yoga, transforming his tiny bench into a yoga mat and using specialized postures custom-tailored for him by his personal yogi.

"Yoga is a great support for this flight above the Pacific: it positively affects my mood and mindset," Borschberg tweeted Thursday with a photo of himself in a pose.

- Next stop: Phoenix -

The plane will now be flown across the United States and eventually, if all goes according to plan, land back in Abu Dhabi next March, where it started its journey earlier this year.

The next leg will be piloted by Piccard and will fly 2,920 miles from Hawaii to Phoenix.

Solar Impusle 2 has 17,000 solar cells and on-board rechargeable lithium batteries, allowing it to fly through the night.

Its wingspan is longer than that of a jumbo jet but it weighs only 2.3 tonnes -- about the same as a car.

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