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Solar Impulse heads to Hawaii as weather clears
Photo: AFP

Solar Impulse heads to Hawaii as weather clears

AFP · 28 Jun 2015, 22:35

Published: 28 Jun 2015 22:35 GMT+02:00

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Swiss pilot André Borschberg, 62, left the ground in the central Japan city of Nagoya around 3:00 am (6pm GMT), five days after weather problems forced the organizers to cancel an earlier attempt to reach Hawaii.
"It took off at 3 o'clock and 4 minutes," spokeswoman Elke Neumann said.
The journey to Hawaii is 7,900 kilometers (4,900 miles) and is expected to last at least five days and five nights.
It is the eighth leg of the circumnavigation, and with nowhere to land after leaving Japan, is considered the riskiest so far.
Borschberg has said he will keep in shape during his long solo flight by doing yoga, and will sleep 20 minutes at a time, normally at night.
But he has also previously admitted that being cooped up in the 3.8-cubic-metre cockpit for long stretches of time is a challenge.

Weather window

Solar Impulse 2 set off from Abu Dhabi earlier this year in a multi-leg attempt to get all the way around the world without a single drop of fuel.

The featherweight flying machine was not supposed to land in Japan, but bad weather en route from Nanjing in China to Hawaii forced a diversion at the start of June.

Story continues below…

The plane has since been stranded in Japan for nearly a month, with the crew scouring long-range forecasts for a favourable weather window.
A chance to restart the record-breaking journey had presented itself Tuesday, with the plane due to leave Nagoya at 2:30 am, but mission chiefs pulled the plug at the 11th hour due to bad weather over the Pacific Ocean.
Neumann said the weather looked good for now but could still change.
In an interview published Thursday, one of the plane's two pilots, Bertrand Piccard, said it must cross the Pacific within a few weeks or it could remain stuck in Japan for a year.
By early August, the days will become too short for the solar-driven plane to cross the Pacific, and subsequently the Atlantic Ocean safely, he told the Tribune de Genève daily.
Solar Impulse 2 has 17,000 solar cells and on-board rechargeable batteries. 

Its top speed is 140 kilometres an hour.
The aircraft's wingspan is longer than that of a jumbo jet, but it weighs only 2.3 tonnes — about the same as a car.
The plane is the successor to Solar Impulse, which managed a 26-hour flight in 2010, proving its ability to store enough power in lithium batteries during the day to keep flying at night.

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