The Solar Impulse 2 (Si2) solar-powered round-the-world aircraft made its first flight from Payerne, Switzerland, on June 2. The 2-hr. 17-min. flight was made on stored battery power. A test of the solar power-generation system will be the next step, says Solar Impulse. The 236-ft. wingspan Si2 has 17,000 solar cells on the wing and tail, and 2,077 lb. of rechargeable lithium ion batteries.  For its first flight, the aircraft was flown by test pilot Marcus Scherdel. Solar Impulse says ...


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