Solar Impulse HB-SIB, the second aircraft from the program headed by Andre’ Borschberg and Bertrand Piccard, took to the skies early this morning piloted by Markus Scherdel. Taking off from Payerne Airport at 3:38 Greenwich Mean Time (GMT) Solar Impulse 2 climbed to a randomly orbiting path within a 20-mile compass of the airfield to the southwest, Lake Neuchatel to the north, and Belleville to the northeast. At about 4:01 GMT, and about 5,300 feet, Scherdel reported a slight vibration and briefly leveled off until determining that it was probably an aerodynamic vibration – not a motor issue, but possibly from a hatch door. He continued climbing and performed a bank angle test of 5° at varying airspeeds and “a steady heading sideslip” to determine that controllability and stability were OK. At 4:47 GMT the team’s web site reported, “Flight Director is quite happy: no problem has been detected on the electrical and propulsion system, stability of airplane is good. …
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