The aircraft suffered the set-back during its unbelievably long flight from Nagoya, Japan, to Hawaii — breaking the record for longest non-stop solo flight, at 117 hours and 52 minutes, in the process. But the takeoff from Japan put too much strain on the batteries that are used to store the solar energy the craft needs to fly.
But now it’s all fixed up and tested. New batteries have been fitted and extra cooling systems installed to prevent the problem reoccurring in the future. A series of 13 test flights — including high-altitude testing — have confirmed it’s ready to go.
The team is now waiting for a “favourable” weather window in which pilot Bertrand Piccard can set off. Depending on conditions, it will head for either Phoenix, San Francisco, Los Angeles or Vancouver. When the Pacific is finally crossed, the rest of the journey remains: on to New York, Europe or North Africa, and then finally Abu Dhabi, where the attempt started.
With 17,000 solar panels on the airplane’s wing to charge 942 kilos of lithium battery, Solar Impulse 2 can cruise at rather slow 88mph. During the long, continuous flights, pilot Andre Borschberg is only able to take 20-minute naps for breaks. But at least now he’s able to fly again.