$100 in parts, according to this guy: http://vicacopter.com http://vicacopter.com I tried (unsuccessfully) to make his design a year ago and it was more like $

$100 in parts, according to this guy: http://vicacopter.com http://vicacopter.com I tried (unsuccessfully) to make his design a year ago and it was more like $300 though, and that assuming you have the RF equipment. Guy works at NASA I think. The claim that his is the only fully open source autopilot is to my knowledge true. No docs or schematics though, but these could be adapted from other projects, http://mikrokopter.de http://mikrokopter.de http://diydrones.com http://diydrones.com