World’s biggest solar-powered plane completes test flight in Hawaii after installing a battery cooling system. After seven months, Solar Impulse 2 has returned to the sky as it prepares to resume its record-setting round-the-world flight.
The huge, sun-powered plane, which smashed the longest solo record last summer from Japan to Hawaii, took off from Oahu's Kalaeloa Airport on Friday for an approximately 90-minute maintenance flight, according to reports.
The plane's wingspan is greater than a Boeing 747's, but it flies only about as fast as a car and weighs only about as much as a large SUV.
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