Servo Magazine (July 2008)
The Vulture Seldom Comes Home to Roost
On a more celestial level, DARPA is also funding a competition to develop an unmanned aerial vehicle that will shatter endurance records. The bird will draw 5 kW of power, carry a 1,000 lb (450 kg) payload, stay aloft for at least five years, and remain in its assigned airspace 99 percent of the time while fighting winds encountered at operating altitudes, reportedly ranging from 60,000 to 90,000 ft (18,000 to 27,000 m). The goal is to provide long-term intelligence, surveillance...