It's the goal of nearly every military unmanned aircraft to stay completely invisible during a mission. Engineers have devised many ways of achieving this, from using radar-absorbing materials in construction to designing control systems that optimize an aircraft's ability to fly below radar. One bold new approach aims to shrink the size of the vehicle itself and offer a cunning disguise to fool any onlookers. The remote-controlled Nano Hummingbird UAS was developed by Monrovia, Calif-based Aero-Vironment Inc., one of the Pentagon's top suppliers of small unmanned aircraft. With a 6.5-inch wing-span and a weight of only 19 grams (0.7 ounces), the tiny flapping-wing drone is marvel of miniature mechanics and cleverly designed to mimic a hummingbird in appearance.
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