Wing-flapping Aircraft Hovers and Flies Life-sized hummingbird-like unmanned surveillance aircraft weighs two-thirds of an ounce, including batteries and video camera. The Nano Hummingbird (Figure 1) is a miniature aircraft developed under the Nano Air Vehicle (NAV) program funded through the Defense Advanced Research Projects Agency (DARPA). DARPA was established to prevent strategic surprise from negatively impacting U

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