I have many Quadcopter videos but nothing beats this. It is a autonomous quadrotor helicopter built by GRASP Lab, University of Pennsylvania. To let a Quadcopter perform a flip is difficult. And to let it perform 3 flips, it is a feat. Plus, watch how it flies through narrow objects at high speed. Amazing.

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When I hear the word UAV, my first thinking is a aircraft-like unmanned vehicle. Now, with advancement in technology and the requirement for more covet operation, designers are thinking of more fanciful design. One DARPA contractor actually made the UAV or NAV (Nano Aerial Vehicles) into the shape of a hummingbird.

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