Quadcopters Tied to a Pole Do Cooperative Acrobaticshttp://spectrum.ieee.org/automaton/robotics/aerial-robots/quadcopters-tied-to-a-pole-do-cooperative-acrobatics#.VUuK5PDt6TI.hackernews by spectruman • 11 years ago 1 0 11 years agoSPspectrum.ieee.org