The University of Pennsylvania GRASP Lab has been doing pretty amazing job with their quad-rotors UAVs.
University of Pennsylvania Aggressive Quad-rotors UAVs
These robots can do pretty impressive manoeuvres that humans would have a very hard time to imitate. They fly trough free-falling ho
This is a companion discussion topic for the original entry at https://community.robotshop.com/blog/show/aggressive-quad-rotors-round-up