D-4 To Solar Impulse 2 #RTW Earliest Possible Takeoff
Originally published on 1Sun4All. The Solar Impulse team was awake very early yesterday morning to support the first Solar Impulse 2 (#Si2) flight outside of Switzerland, the description under a new #Si2 YouTube video noted. “Markus, our test pilot, was the first to test the plane in the air. André Borschberg then perform [sic] … [continued]