It took 12 years of research and testing, including flights of the previous version, to finally build the aircraft they believe will be able to fly around the world in 20 flying days spread over three months.
Chairman of the Solar Impulse project Bertrand Piccard says every detail on the airplane is designed for maximum efficiency.
This airplane is an example of energy efficiency, how we save the energy, and how the energy from the sun is enough to keep the airplane in the air day and night, said Piccard.
While flying on auto-pilot, either pilot will be able to sleep for a while, use the toilet, even exercise.
Borschberg says the goal is not to promote building more solar-powered planes.
It is to bring products to their clients which are more energy efficient: in home buildings, in transportation, in appliances, it can be lighting, he said.
Solar Impulse 2 is scheduled to begin test flights in May, while the actual circumnavigation is planned to start next March from an airport somewhere in the Persian Gulf.
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