http://www.wired.com/2015/05/watch-foldable-mini-drone-launch-snap/
"Robotics researchers Stefano Mintchev and Dario Floreano at the Swiss Federal Institute of Technology
unveiled their creation yesterday: a wee quadrotor drone whose arms
wrap around itself, folding into a trapezoid for compact storage. When
it needs to fly, the arms—a 0.3-millimeter layer of fiberglass and an
underlying layer of inextensible fabric—snap out in an instant, the
rotors begin spinning, and the drone shoots off into the air. Of course,
you still need to fold it by hand, but the researchers are working on
an automated folding mechanism (and also, don’t be such an impatient
pain in the ass)."
Not bad.
Nice
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