PAYERNE: The masterminds of sun-powered plane Solar Impulse formally unveiled their new aircraft yesterday, a year ahead of their planned round-the-world flight.
Solar Impulse 2 is the successor of the original plane of the same name, which last year completed a trip across the United States without using a drop of fuel.
“These two aeroplanes are the most energy efficient aeroplanes ever designed,” pilot Andre Borschberg told a 500-strong audience of officials, sponsors and diplomats at Switzerland’s Payerne airbase.
“The first plane was a prototype, a flying laboratory,” said the former Swiss Air Force jet pilot.
Solar Impulse 2 is a bigger, better version of its predecessor, he said, reeling off the new aircraft’s statistics.
The new plane has a wingspan of 72 metres.
While that is the same as an Airbus A380, at just 2,300 kilos, Solar Impulse 2 is less than 1 percent the weight of the super jumbo jet.
That is thanks to the fact that the plane is built from carbon layers that weigh less than 25 gramme per square metre — one-third the weight of a sheet of paper, Borschberg said.
It will be powered by 17,248 solar cells spread across its wings and fuselage.
The goal, Borschberg said, is to be able to fly for at least 120 hours non-stop around the globe.
After test flights in Switzerland starting next month, the plan is to take off sometime after March 1, 2015 from a location in the Gulf, ideal for its weather conditions, and head eastwards.
“We will need at least five days and five nights to fly from China to the US and from the US back to Europe,” said Borschberg.
While that cannot compete with traditional air travel, the point of the project is to push the boundaries of green-flavoured research, said fellow pilot Bertrand Piccard, the latest member of a dynasty of Swiss scientists-cum-adventurers.
Borschberg said that the plane’s designers had wrestled with issues such as the fact that more reliable technology tends to be heavier, but that weight means less performance.