(ANSAmed) - GENEVA, MAY 24 - The adventure of the first Mediterranean flight to be conducted by the Swiss plane Solar Impulse, which runs exclusively on solar power, has begun. The HB-SIA took off this morning just before 8:30 AM from the military airport of Payerne (Switzerland) and is headed towards Madrid, the first stop of an intercontinental trip which will take the aircraft to Morocco under the Swiss pilot Andre' Borshberg. The takeover had been scheduled for 6:45 but was delayed due to slight fog. The prototype is due to land in Madrid-Barajas in the early morning hours of Friday. The stop in the Spanish capital will allow for a change of pilots, with Borshberg's fellow countryman Bertrand Piccard taking over for the second leg of the trip to Rabat. The take-off is expected to happen a few days later. For the first time in the world, the ultra-lightweight carbon-fibre aircraft is to fly over 2,500 km without a single drop of fuel. The place - with a wingspan of an Airbus a340 (63.4 metres) and weighing the same as a family car (1,600 kg) - already conducted its first international flight last year to Paris and Brussels. The flight to Morocco is considered a trial run before the Solar Impulse's around-the-world flight in 2014, for which a new plane is being built. (ANSAmed).