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The experimental aircraft "Solar Impulse" is prepared to take off with German test pilot Markus Scherdel from the airbase in Payerne, Switzerland, on Wednesday, April 6, 2011 for the first test flight
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![The experimental aircraft "Solar Impulse" is prepared to take off with German test pilot Markus Scherdel from the airbase in Payerne, Switzerland, on Wednesday, April 6, 2011 for the first test flight The experimental aircraft "Solar Impulse" is prepared to take off with German test pilot Markus Scherdel from the airbase in Payerne, Switzerland, on Wednesday, April 6, 2011 for the first test flight](https://c8.alamy.com/comp/2P77RC6/the-experimental-aircraft-solar-impulse-is-prepared-to-take-off-with-german-test-pilot-markus-scherdel-from-the-airbase-in-payerne-switzerland-on-wednesday-april-6-2011-for-the-first-test-flight-in-2011-solar-impulse-is-ultimately-aiming-for-the-aviators-dream-of-perpetual-flight-and-to-prove-a-point-by-flying-through-the-night-the-propeller-plane-with-a-61-meter-200-foot-wingspan-is-powered-by-four-electric-motors-and-designed-to-fly-day-and-night-by-saving-surplus-energy-from-its-12000-solar-cells-in-high-performance-batteries-ap-photokeystone-dominic-favre-2P77RC6.jpg)