Despite its apparent fragility, the solar-powered Zephyr has set a new record for unmanned flight and managed to stay aloft for a total time of 83 hours and 37 minutes (not too far south of four days). The Zephyr makes use of solar panels which power and lithium-sulfur batteries to allow 24 hour flight.

Of course, this thing has military applications, the plan is to use them as a surveillance platform, with the military hoping for indefinite flight. [Associated Press via DVICE]

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