Although he has flown HB-SIA in a simulator, Mr Borschberg says he will not really know how it performs until the first test flight later this year.
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So, although it has a wingspan of 61 metres, HB-SIA has room only for a pilot.
With all four engines at full power, HB-SIA is only as powerful as a motor scooter.
The HB-SIA craft was piloted by Bertrand Piccard, a co-founder of the effort, who is perhaps best known for being the first person to circumnavigate the globe in a hot-air balloon, in 1999.
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