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Thinking of a gravity fed magazine for this design ~ that way you don't need a SPRING.

Having gone over this before, but you should be able to build a small 'rocket' as a server ~ using your ipad/ipod/android as a client with an Ap that steers toward the center of your camera shot.

A ramjet design would be OK ~ air in front, burn in the middle, thrust out the rear ~ (this is a really short burn device which simplifies both the steering method ~ and the combustion chamber).

It delivers a poison needle, a piece of broken glass, whatever ~ all light weight stuff so the rocket can take it further.

The launching device ~ now being printed out as a plastic gun, can be simplified and you could use these as remote firing sites under just your control.

So, how many such devices could you control with a Iphone? Should be as many as the telephone array I saw being set up yesterday in a large home. To make sure a handicapped person is always near a phone they hooked up what seemed to be 18 phones in various spots. The designer saw no problem at all in handling that many devices simultaneously from an Iphone. Certainly remote firing points would be no greater problem for launching miniature but very deadly simple gunpowder driven ramjets.

The propellant is simple ~ using your traditional black powder recipe found in every dictionary, substitute pulverized AGAR AGAR for the charcoal. That way you don't need to roll out compressed grains ~ the flash powder will work just fine. I'm thinking you could brush it onto scotch tape, then roll it around a small plastic tube shaped core. It would burn around the wrapping applying steady thrust.

The 3Dprinter should provide you the accuracy needed to produce ammo tubes that don't tumble in flight!