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Originally Posted by [527]phil
A coilgun is the not so correct name for an electromagnetic projectile accelerator. Basically a bank of capacitors is charged to a high voltage and/or high amperage. Then the current is forced all at once through a coil of wire, kind of like a solenoid. The magnetic field caused by the coil attracts a ferrous projectile that is inside a tube that runs through the coil. The current is then shut off once the projectile reaches the middle of the coil and the projectile leaves the front of the barrel.
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You're making something I can only dream of! Haha..
In gaming terms its called a Railgun I suppose. I voted for single coil.. coz I thought additional accelerator stages can be easily added and controlled timing to the microsecond with a microcontroller
Your coil is hollow and the medium is air.. so I guess the permeability of the medium would be some kinda constant of air? Just a quick guess..