In case you thought that the solar-powered plane Solar Impulse with its record 26 hour flight was impressive, you might want to check out the QinetiQ Zephyr solar powered unmanned aircraft.
Two years ago, the Zephyr was able to stay in the air for almost three and a half days, and now the design team is going to make certain that it has the ability to stay in the air almost indefinitely.
The Zephyr has a 74 foot wingspan, but weighs in at 110 pounds. It is powered by solar panels that are about as thin as a sheet of paper, and there are batteries along the wings that can keep it powered for night flights.
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