Quadcopter / Drone / RC Helicopter Automatic Deploying & Retracting Payload Hook

Here at H5 labs, we like neat things such as 3D printers, quad-copters, Robots, lasers - you know, the usual geek fare. We have enjoyed our DJI Phantom 3 drone, but we wanted to do more than just take nice pictures with it. So, we came up with a payload hook system so that we can deliver small items to "remote" areas - all without requiring any additional radio channels.

We got to thinking about a hook hanging from the bottom of the aircraft, but quickly realized it would be a problem for t