Solar Impulse Back In The Air After Battery Upgrade

Credit: Solar Impulse 2: Milko Vuille
Solar Impulse 2 (Si2) has completed its first test flight following a battery system upgrade and ahead of restarting its solar-powered round-the-world flight attempt in April from Hawaii. The aircraft has been in storage in the University of Hawaii’s hangar at Kalaeloa Airport since its batteries...

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