Credit: NPS/ The Economist
Unmanned gliders will soon be able to stay airborne indefinitely & so act as communication relays, keep a persistent eye on the ground below & even track marine animals thousands of kilometres across the ocean.
http://www.economist.com/blogs/babbage/2013/02/unmanned-gliders / hand-launched Tactical Long Endurance Unmanned Aerial System TALEUAS developed United States Naval Postgraduate School in Monterey California electric motor propeller airborne altitude riding rising currents warm air thermals senses sense lift spirals around take advantage vultures eagles birds of prey soaring birds use technique Kevin Jones charge project raptors drone more efficient endurance limited power requirements electronics payload battery powered covering the craft’s wings with solar cells PV photovoltaic photo voltaic generate power during the day lithium-polymer battery ithium-ion capable storing energy to last the night stay aloft indefinitely chance locate orographic dynamic soaring heavier-than-air artefact airborne /
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