Solar-powered plane takes off on historic round-the-world trip

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Solar plane to take off on 1st round-the-world flight

The Solar Impulse 2 took off from Abu Dhabi just after dawn Monday morning, beginning its journey around the world in a historic attempt to circumnavigate the globe without using fossil fuel.

The aircraft will fly for 25 days over a five month period as it completes the 35,000-kilometer (21,700-mile) journey. For much of the flight it will aim for an optimal speed of 45 kph (28 mph) and an altitude of 28,000 feet (8,500 meters) during the day and 5,000 feet (1,500 meters) at night.

The Solar Impulse 2 is a larger version of a single-seat prototype that first flew five years ago.

It has a wingspan of 236 feet (72 meters), which is larger than that of the Boeing 747.

Built into the wings are 17,248 ultra-efficient solar cells that transfer solar energy to four electrical motors that power the plane’s propellers.

The solar cells also recharge four lithium polymer batteries.

At around 2,300 kilograms (5,070 pounds), the Si2 weighs about as much as a minivan or mid-sized truck.

An empty Boeing 747, in comparison, weighs some 180,000 kilograms (400,000 pounds).

Solar Impulse founder André Borschberg was at the controls of the single-seat aircraft when it lumbered into the air at the Al Bateen Executive Airport. Borschberg will trade off piloting with Solar Impulse co-founder Bertrand Piccard during layovers on the journey before the plane returns to Abu Dhabi in late July or August. Some legs of the trip, such as over the Pacific and Atlantic oceans, will mean five days and five nights of flying solo.

“It is also exciting because you know, you simulate, you calculate, you imagine, but there is nothing like testing and doing it in real,”

Borschberg said just hours before takeoff. “I am sure we are all confident and hopefully we will be able to see each other here in five months.”

The Si2 is heading first to nearby Muscat, Oman, where it will land after about 10 hours of flight. A typical passenger jet takes just one hour to make the same journey. Piccard says the best speed for the lightweight Si2 — made of carbon fiber — is at about 25 knots, or 45 kph (28 mph).

Borschberg has been practicing yoga and Piccard self-hypnosis in order to calm their minds and manage fatigue during the long solo flights. They aim to rest a maximum of 20 minutes straight, repeating the naps 12 times over a 24-hour period. Goggles worn over the pilot’s eyes will flash lights to wake him up.

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The Solar Impulse 2 as it prepares to depart from Abu Dhabi, United Arab Emirates, on Monday. IMAGE: AYA BATRAWY/ASSOCIATED PRESS

Neither pilot will be able to stand in the cockpit while flying, but the seat reclines for stretching and its cushion can be removed for access to a toilet.

Armbands placed underneath their suits will buzz if the plane isn’t flying level. The plane also does not have a pressurized cockpit so Borschberg and Piccard will be able to feel the changes in temperature. The pilot’s blood oxygen levels constantly will be monitored and sent back to ground control.

The plane will reach an altitude of around 28,000 feet (8,500 meters) during the day to catch the sun’s rays and at night dip to around 5,000 feet (1,500 meters) when flying over the ocean.

“You have to make the cockpit like your own house for a week in the air.”

Piccard is no stranger to aviation feats. In 1999, he and another man succeeded in the first non-stop balloon circumnavigation of the world.

After two stops in India, the Si2 will head to China, where it will stay for a month until the days are longer to catch more of the sun’s energy. It will also make stops in Myanmar, Hawaii, Phoenix, Arizona and New York’s John F. Kennedy International Airport. The path across the Atlantic will depend on the weather and may include stops in southern Europe or Morocco.

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The Solar Impulse 2 prepares to depart at an airport in Abu Dhabi, United Arab Emirates, early Monday, March 9, 2015.

Those curious can follow the aircraft on Solar Impulse’s website and track its battery status, energy consumption, location and flight path, as well as how much the pilot has slept and how much food and water he has left. There is also a live feed of the plane’s Monaco-based control room with occasional footage from the cockpit.

Borschberg and Piccard say the flight is to make the world “confront the Conference on Climate Change of the United Nations, which will define the new Kyoto protocol in December 2015 in Paris.” All countries are supposed to present targets for a new global climate agreement at the meeting.

Solar Impulse supporter Prince Albert of Monaco was present at the plane’s control centre during Monday’s takeoff. The UAE-based Masdar, the Abu Dhabi government’s clean-energy company, is a key sponsor of the flight.

As the plane waited on the runway, a brief electrical alarm threatened to delay takeoff, but it was quickly resolved, allowing the large plane to slowly lift off into the rising sun.

“Everybody was just hoping the airplane will go,” Piccard said. “Now the adventure has started.”

The Associated Press contributed reporting.

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