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Unmanned air vehicles (UAV) are assuming a prominent role in aviation and the future may have already arrived. Most of us have heard of the Global Hawk and Predator UAVs, which have been collecting real-time battlefield data without risking loss of life. However, the most amazing performance and avionics can be found in airplane-model-size MiniUAVs and insect-like MicroUAVs still on the drawing board. Meanwhile the all-electric NASA Helios "tower in the sky" is moving ever closer to reality.