foldable multiwii quadcopter

this is my first foldable quadcopter that i designed to accompany me on hikes in the mountains. the model was created in creo elements express (free cad package from ptc). the model can therefore be modified freely.
here's a first film of the thing in the air:
http://youtu.be/YMQ7jQ2xo2A

the main picture shows the quadcopter after the first crash. despite a free fall of more than 20 m nothing major got damaged except for the legs that broke off.

quadcopter on my site:
http://www.muel