The carbon fibre aircraft has a huge wingspan which at 72m is wider than a boeing 747 jet.
Bbc solar panel plane.
Media caption andre borschberg gives the bbc a guided tour of the solar plane.
A solar powered plane is expected to begin the first ever round the world trip of its kind on monday.
An independent survey of mr thompson s system showed even after 20 years the income from.
The unmanned craft flies high in the atmosphere to avoid commercial air traffic and adverse weather.
Media caption take off occurred at 23 30 gmt.
Image caption the financial services ombudsman said it had received 2 000 complaints about solar panels.
Solar plane takes off on test flight jump to media player a solar powered plane that will try to fly around the world in 2015 is making its first test flight after taking off in switzerland.
Close share panel media playback is unsupported on your device media caption the bbc s john sudworth watched solar impulse take off from nanjing on the most difficult phase of its round the world.
It will be the first ever manned night flight on a plane propelled exclusively by solar energy.
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A solar plane which can stay aloft for weeks at a time is to be manufactured by airbus in the uk.
And yet the vehicle.
The zero fuel aeroplane solar impulse has left the egyptian capital cairo on the last leg of its global tour.