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How much Joule does a coilgun need? Answered

So I always wanted a coilgun but in germany there arent any stores that give away used cameras with flash for free because they all send them away whole to a factory for development. I recently bought a pack of random capacitors for 2,50€ and now im asking myself if the capacitors in it are enough. There are many different caps in it but the biggest  are : one 63V 1000µF and six 100V 100µF. 
The single big one has a power of 1.985 J and the six small ones a power of 3 J together.
I dont want a gun to kill people but i still want it to shoot and penetrate paper and stuff like that.
So how much Joule do i need for the gun to work properly

Discussions

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iceng

4 years ago

Not a great deal of Joule, Snowy.

I can curl my tongue and accelerate a grape seed right through a sheet of laser paper.

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mpilchfamily

4 years ago

Look up schematics for various coil guns and flash circuits and find one that uses parts you can easily source.