27 May '15, 2am

Foldable Quadrotor is Origamilicious

A team at the French École Polytechnique Fédéral de Lausanne has developed and built a quadcopter with arms that unfold just before takeoff . The idea is that you can fold the device back up when you’re done with it, making it possible to store a bunch more of the quads in your backpack for instance. The unfolding mechanism relies on the torque of the rotors spinning up to swing the arms into place. Once fully extended, a spring-loaded flap folds up, catches on some magnets, and forms an L-shaped structure that won’t re-fold without human intervention. Under normal flying conditions, quads have a two left-handed propellers and two right-handed ones and the motors spin in opposite directions. In order to do the unfolding, two of the motors need to run essentially in reverse until the frame has clicked into place. They use a sensor (Hall effect?) to detect the arm locking, a...

Full article: http://hackaday.com/2015/05/26/foldable-quadrotor-is-orig...

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