A quick 'demo' build of the HobbyKing 'Candy Dropper' for an upcoming visit to a school to talk about drones for conservation and search & rescue. This is an inexpensive RC drone 'delivery system' and can be attached to multicopters, planes etc.
The 'Candy Dropper' module comes pre-built, it's made of a tough nylon/plastic, it uses a servo at either end to open the hatches. Just attach the (included) Y servo cable and nominate a channel. It is powered and controlled through the RC receiver.