Unmanned Glider May Hold Secret To Perpetual Flight...

Engineers from the Australian Centre for Field Robotics in Sydney are working on an autopilot system for gliders that senses thermals and adjusts its course, utilizing the thermal currents to stay aloft. Couple that abil...

http://www.neatorama.com/2011/07/05/unmanned-glider-may-hold-secret-to-perpetual-flight/