This is a device i am currenctly working on in hope of adapting it to my Alteran Cityship. It uses party snaps, the little white paper things to create a small explosion effect. This is a new thing to me building lanchers i build my first tank yesterday for crying out loud.
About this creation
The launcher works by having a rubber band attached to an arm inside the device, this creates tension. To fire it you pull back on it and release fireing Drones. This needs work however to improve range and force.