Foldable tricopter

This project of a tricopter was derived from an existing one called Brocopter. I advise you to have a look at this drone before. You can find all the instructions, CAD files and videos of the original at this link : http://www.thingiverse.com/thing:413639
So at the beginning, my idea was to build a drone as cheap as possible and which could be easy to build and then to carry. That’s why I decided to make this foldable version of a drone. But in order to save some money, I’ve made some modifica