Unveiled earlier this month in Payerne, Switzerland, the Solar Impulse 2 is scheduled to quickly proceed to flight testing ahead of its solar-powered around-the-world attempt next year. First flight is planned for mid-May, and circumnavigation is required to begin in March 2015 to avoid the monsoon season. Testing will be relatively unusual, by aviation standards, as only part of the flight envelope will be explored. Project leaders Bertrand Piccard and Andre Borschberg will examine ...


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