KAPOLEI, Hawaii — Two pilots are slowly carving their way into a new future of solar-powered flight as one of them embarks on the latest leg of their around-the-world journey in a plane powered only by the sun.

After some uncertainty about the winds, the Solar Impulse team took off from Hawaii early Thursday. The aircraft landed in Hawaii last July but was forced to stay in the islands after the plane’s battery system sustained heat damage on its trip from Japan.

The Swiss-made Solar Impulse 2 is now on course to land in Mountain View, California, in about three days.

The aircraft started its journey in March 2015 from Abu Dhabi, the capital of the United Arab Emirates, then made stops in Oman, Myanmar, China and Japan.

Pilot Bertrand Piccard, who is flying this leg of the trip, said the idea of crossing the ocean in a solar-powered plane a few years ago stressed him out, but Thursday morning he was confident things would go according to plan.

The plane’s ideal flight speed is about 28 mph, though that can double during the day when the sun’s rays are strongest.