Solar Impulse, the none-fuel plane, has left Cairo as it makes the final lap of its global tour. The plane will take about 48 hours from Egypt’s capital to Abu Dhabi, UEA – where it started the circumnavigation in March 2015.
Pilot Bertrand Piccard is at the controls one final time.
It is expected that the flight will be straightforward although concerns have been raised regarding the effect of Middle East heat on the plane.
Mr Piccard is likely to have to spend a lot of time at high altitude on oxygen to get above the thermals and the turbulence they induce.
Mr Piccard said: “We thought it was going to be an easy flight because it’s always good weather between Egypt and Abu Dhabi across Saudi. But actually, it’s extremely difficult to find a good strategy.”
First plane to circumnavigate with no fuel
So far, Solar Impulse has covered 30,000 km as it seeks to be the first plane to circle the world on no fuel.
The Cairo-Abu Dhabi flight marks the 17th and final segment in the journey, which has included crossings of the Pacific and Atlantic oceans.
Mr Piccard has alternated pilot duties with his friend and business partner Andre Borschberg.
The two have been working on the Solar Impulse project for more than a decade.
Their plane is wider than a 747 jumbo jet but weighs just 2.3 tones.