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GENEVA - An experimental solar-powered airplane took off from Switzerland on its first transcontinental flight Thursday, aiming to reach North Africa next week.

Pilot Andre Borschberg planned to take the jumbo jet-size Solar Impulse plane on its first leg to Madrid by Friday. His colleague Bertrand Piccard will take the helm of the aircraft for the second stretch of its 1,554-mile journey to the Moroccan capital Rabat.

Fog on the runaway at its home base in Payerne, Switzerland, delayed the takeoff by two hours, demonstrating how susceptible the prototype single-seater aircraft is to adverse weather.

“We can’t fly into clouds because it was not designed for that,’’ Borschberg said as he piloted the lumbering plane with its 207-foot wingspan toward the French city of Lyon at a cruising speed of just 43.5 mph.


Before landing in Madrid, Borschberg will face other challenges, including having to fly over the Pyrenees mountains, which separate France and Spain.

Just in case things go disastrously wrong, Borschberg has a parachute that he hopes never to use.

“When you take an umbrella, it never rains,’’ he joked in a satellite call with the Associated Press.

Piccard, the son of undersea explorer Jacques Piccard and grandson of balloonist Auguste Piccard, will have to cross the windy Straits of Gibraltar from Europe to Africa.

The team has been invited to Morocco by the country’s King Mohammed VI to showcase the cutting edge of solar technology. Morocco is about to start construction on a massive solar energy plant at Ouarzazate. The plant will form part of a countrywide solar energy grid with a capacity of 2,000 megawatts.

The mission is described as the final dress rehearsal for a round-the-world flight with a new and improved aircraft in 2014. That trip will include stops in the United States, Borschberg said. In 2010, the Swiss pilot flew nonstop for 26 hours to demonstrate that the 12,000 solar cells attached to the aircraft can soak up enough sunlight to keep the plane airborne through the night. A year later, he took Solar Impulse on its first international flight.


The project began in 2003 and is estimated to cost about $100 million over 10 years.