Found on BotJunkie.com: http://www.botjunkie.com/tag/quadrotor/
A quadrotor is a small, helicopter-like robot with 4 propellers. It's a project that seems to be a semi-classic robotics experiment for colleges and advanced techniques. Here's two colleges that have done some impressive work on quadrotors.
Aggressive quadrotor maneuvers
This is from the GRASP lab at the University of Pennsylvania. Note that the accurate movement is helped by the infrared cameras and lights mounted around the room.
Flying Inverted Pendulum
This is the Swiss Federal Institute of Technology Munich, which has balanced an inverted pendulum on one of their quadrotors. An inverted pendulum is an upside-down pendulum where the bottom, mounted part moves to keep the top, swinging part in balance. This is like when you balance something on your nose or in your hand, like a yardstick.
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