Record solar plane's first 'hop'

The Solar Impulse prototype plane, part of a planned solar-powered circumnavigation of the globe, has left the ground for the first time.

The maiden flight was dubbed a "flea hop" by project leaders, at 350m in length and a height of just one metre.

The plane will now be transported to a different airfield for a flight of a few hours in March.

The final version of the plane will attempt a transatlantic flight in 2012 prior to the round-the-world trip.

The prototype first ventured outside a hangar in November, with a range of on-the-ground tests and a run-up of the plane's motors.
Solar Impulse plane

Thursday's flight, with test pilot Markus Scherdel at the controls, was the first time the plane had been brought to takeoff speed.

"The airplane flew the way we have experienced it in the simulators," said Bertrand Piccard, a founder of Solar Impulse and the first person to carry out a round-the-world balloon flight.

"That's of course a very big comfort for all the engineers who've worked for six years to build this airplane."

The next flight, at the Payerne air force airfield in western Switzerland, will see the plane reach an altitude of nearly 9,000m.

Only after this flight will the plane make its first "solar flight" - that is, powered by the solar generators rather than the on-board batteries.

The team plans a flight of a full day and night in the summer of 2010, building up to a transatlantic flight in small steps as the crew ensure the plane's behaviour is well-understood.

"It's a completely new flight domain," said Dr Piccard.

"It's the first time in the history of aviation that an airplane so big and so light using so little energy gets in the air - basically everything is new."

Source - BBC

Solar powered plane ready for take off

Solar Impulse HB-SIA, the world’s first aircraft the first aircraft designed to fly around the clock without using fossil fuel or polluting the planet, was unveiled at a Swiss military airfield last week.

The project, which aims to show how new technology can be harnessed to fight climate change, is the brainchild of adventurer Bertrand Piccard and fighter pilot Andre Borschberg. It follows from the world’s first non-stop flight around the world in a balloon by Piccard and Brian Jones in 1999.

Following a 2001 study into the feasibility of a solar powered circumnavigation flight, engineer and fighter pilot Borschberg joined as project manager. The €76m project began formally on 28 November 2003.

Dassault Aviation, which designed and built the Mirage fighter, offered to help with the aero-elasticity and flight commands, safety and system reliability. Through that relationship, Dassault Systemes, the computer aided design and manufacture firm, sponsored a full design capability for seven engineers.

Robert Fraefel, head of the design team and manager of structural production for the aeroplane, said it would have been impossible to develop the project in just six years without computerised help.

“Mr Borschberg kept saying to us, ‘This is a risky project – take risks!’, but as an engineer, you still want a margin of safety,” he said.

Fraefel, whose previous job was designing cars for the Sauber Formula 1 team, said the main challenge was having a completely blank sheet of paper.

“Usually you make small improvements to an existing part, but we had nothing to guide us except the maths and the physics calculations. Fortunately, they all worked perfectly, and sometimes even better in practice than in design,” he said.

The intensity, six days a week for three years, forged a close family spirit among the 15 core members of the team. “We even had two marriages and a couple of births,” Fraefel said.

Source - Solar Impulse