The aircraft took off from Nagoya, Japan, Sunday on a planned 120-hour flight to Hawaii. Clearly, it is not out for a speed record; it was cruising at a ground speed of about 10 miles an hour when I watched it online.
In 2010, the craft flew a then-record breaking 26 consecutive hours. When it landed, it reportedly had enough battery left for another six hours in the air. Only five years later, the flight from Japan to Hawaii is scheduled for nearly five times as long. The goal is a 13-segment flight around the world – a seemingly easy feat for nearly any four-motored aircraft – except this one is powered by the sun.
Solar panels on the wings and fuselage charge the batteries during the day, while the airplane climbs as high as 30,000 feet. Then during the night, it runs the battery-powered motors in a long, slow, descent. Along the way, pilot and CEO André Borschberg snatches 20-minute naps.