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.muellerr.ch/quadcopter-5/further material required: