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solar-powered aeroplane, Solar Impulse, has completed a three-day flight
over the Pacific Ocean.
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It flew over San Francisco¡¯s Golden Gate Bridge on Saturday evening as
it prepared to land in California.
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The plane took off from Hawaii on Thursday, where it underwent repairs
for the past eight months after its batteries were damaged during the
flight from Japan.
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This is the ninth leg of its attempt to fly round the world.
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"I crossed the bridge. I am officially in America," said pilot Bertrand
Piccard as he flew above San Francisco Bay.
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Solar Impulse started the journey last March in Abu Dhabi. The trip has
involved two different pilots flying separate legs.
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Piccard will land the plane later on Saturday evening at Moffett
Airfield, located in Mountain View in Silicon Valley.
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The landing is being delayed until winds drop.
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Solar Impulse gets all its energy from the sun - through the 17,000
photovoltaic cells that cover the top surfaces of the craft.
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These power propellers during the day, but also charge batteries that
the vehicle¡¯s motors can then call on during the night.
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The distance on this leg was 4,000km or 2,200 nautical miles.
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Starting in Abu Dhabi, UAE, in March, Solar Impulse crossed Oman, India,
Myanmar, and China.
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It then flew to Japan, before undertaking a 8,924km passage to Hawaii.
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That five-day, five-night crossing set a record for the longest ever
non-stop solo aeroplane journey.
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But the vehicle¡¯s batteries overheated during the trip, forcing the
project to stop on the Pacific archipelago while repairs were conducted.
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A further 20m euros (16m pounds; 23m dollars) had to be raised from
supporters during the winter to keep the project going for another year.
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Piccard shares flying duties with his business partner, Andre Borschberg.
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It was Borschberg who flew into Kalaeloa last July, and he will next
take the controls on the next leg across the US mainland.
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The pair¡¯s intention is to reach New York by the start of June, to begin
preparations for an Atlantic crossing.
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Assuming this is completed successfully, it should then be a relatively
straightforward run back to the "finish line" in Abu Dhabi.
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They first trialled a smaller plane, taking it on a trans-America
crossing in 2013.
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The version of the vehicle they currently fly is considerably bigger.
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Its wingspan is wider than a 747 jumbo jet, and, yet, it weighs only 2.3
tonnes.
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¡¯Living creation¡¯
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Because the prop-driven craft moves so slowly, mission legs can take
several days and nights of continuous flight.
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This means Piccard and Borschberg - whoever is at the controls - have to
stay alert for nearly all of the time they are airborne.
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They are permitted only catnaps of up to 20 minutes - in the same way a
single-handed, round-the-world yachtsman would catch small periods of
sleep.
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They also have to endure the physical discomfort of being confined in a
cockpit that measures just 3.8 cubic metres in volume - not a lot bigger
than a public telephone box.
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But Borschberg says the experience so far has been exhilarating.
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"An experimental plane is a living creation," he told BBC News.
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"Each flight you do brings new learning that you can use to improve the
quality, reliability and performance of the aeroplane."
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