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World|science|March 19, 2015 / 05:23 PM
Solar Impulse: Plane completes Ahmedabad to Varanasi leg

AKIPRESS.COM - Solar Impulse, the solar-powered plane attempting to fly around the world, has completed on Wednesday the first leg in a two-hop journey from India to Myanmar, BBC Science Correspondent Jonathan Amos  reports.

Solar Impulse, with Andre Borschberg at the controls, left Ahmedabad early on Wednesday, touching down a little over 13 hours later in darkness in Varanasi.

It will be just a short "pit stop" in India's northeast before the vehicle pushes on over the Bay of Bengal.

The leg to Mandalay in Myanmar (Burma) will be flown by Bertrand Piccard.

The two pilots are taking it in turns to guide Solar Impulse on its circumnavigation of the globe.

So far, they have covered about 3,000km in the three segments flown since beginning the adventure in Abu Dhabi on 9 March.

It will likely be another five months before they return to the United Arab Emirates, having crossed both the Pacific and Atlantic oceans in the process.

Wednesday's take-off was delayed by almost two hours because of customs issues.

But then Borschberg completed the roughly 1,100km from Ahmedabad to Varanasi slightly faster than had been anticipated.

The team is laying over for about eight hours before taking off for Mandalay.

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This fourth leg is longer - about 1,500km - and has some tricky conditions to negotiate.

"In Varanasi, we can expect to have foggy mornings, which could be a problem for an early take-off," explained Christophe Beesau, who works on flight strategy.

"And for leg four, of course, we will cross the Bay of Bengal. This may be challenging because we have often at altitude an important wind, and, on the other hand, due to air traffic control restrictions, we have to keep the track.

"We know that we will have to adjust carefully the flight profile to avoid this problem."

Also, about two hours before landing in Mandalay, Solar Impulse will have to fly over a big range of mountains up to 3,000m in height.

It will aim to get this done before sunset so that it can then gently descend towards the Myanmar city in the dark.

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