http://www.arducopter.co.uk/iris-quadcopter-uav.html
https://store.3dr.com/products/3dr-pixhawk
http://ardupilot.org/copter/docs/build-your-own-multicopter.html#build-your-own-multicopter
http://www.arducopter.co.uk/iris-quadcopter-uav.html
https://store.3dr.com/products/3dr-pixhawk
http://ardupilot.org/copter/docs/build-your-own-multicopter.html#build-your-own-multicopter