http://techtv.mit.edu/videos/4149-indoor-autonomous-helicopter (watch what happens at 1:41 in the embedded video on this page!)
http://groups.csail.mit.edu/rrg/videos.html (Various stages of development)
There was a demo in Agra ? :o
http://www.youtube.com/watch?v=I31GWys6sbk
{:)} {:)}
Fantastic motivating I really look forward to some young brains from India doing such work.
The interesting thing here is that the Quad rotor airframe is again German ( Ascending technologies GMBH ) 8-) .
The Germans seem to be the master of Quads, as they say if you want to make a Quad learn German first .
Sai
It looks like at least some of these use more than 4 rotors.