Solar Impulse 2, a solar-powered plane co-founded by Swiss pilot Andre Borschberg, took off today on a potentially record-breaking flight across the Pacific Ocean. The BBC reports that the single-seater left Japan's Nagoya Airfield at 18:03 GMT (a little after noon CT) and hopes to reach Hawaii in roughly five days. In total, the flight would traverse 8,200km or approximately 5,095 miles. If successful, the BBC notes the Solar Impulse team will break records for both the longest-duration solo flight and the furthest distance flown by an entirely solar-powered aircraft.
Borschberg and partner Bertrand Piccard hope that the third time is the charm for this endeavor. The plane's first attempt at takeoff in May was cut short by the forecast causing an unscheduled landing, and the second attempt (occurring last Tuesday, June 23) was postponed for similar reasons. According to the BBC report, the team hasn't aggressively publicized its take off today just incase weather conditions again cause an unexpected landing. At the time of this article, Solar Impulse's official site and Twitter account remained mum on its current progress. The BBC reported the point of no return is set at about eight hours, so Solar Impulse should know within the next two hours.
Solar Impulse 2 has a bigger wingspan than a jumbo jet, but it's light (roughly the weight of a car) and powered solely by 17,000 solar cells. "During the day, the solar cells recharge lithium batteries weighing 633 Kg (2077 lbs.) which allow the aircraft to fly at night and therefore to have virtually unlimited autonomy," the team states on its About page. Of course beyond technical challenges, the human element of this record-attempt also present a significant hurdle. Borschberg's space is roughly the size of a phone booth according to the BBC, and the pilot will only be able to take 20-minute naps throughout this initial leg. If a water landing must happen, the plane contains supplies for its pilot to survive for an entire week during recovery.
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