The unmanned aircraft has a wing span of 18 meters but weighs only 30 kg, utilizing a structure constructed of carbon fibers and powered by solar energy generated by amorphous silicon arrays covering the aircraft’s wings. These cells, no thicker than sheets of paper also form the wing's airfoil. The hand-launched drone uses different energy resources during the different flight phases. By day it flies on solar power generated by part of the solar arrays. By night it is powered by rechargeable lithium-sulphur batteries that are recharged during the day using solar power.
More info at these links...
Defense Update
Aero Society Channel
Global Observer -- good video clip here.
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