[[527]phil]

Thanks for your assitance so far, but please read all the posts before responding, I explained how a coilgun works already. And i've made these before, however they were highly inefficient, and kevin I disagree. I've been able to shoot projectiles through tin cans and drywall sheets, at the moment the technology isn't advanced enough to be usefull, but they could be in the future. Also copper does not work, the projectile has to be steel, or another material that can be attracted to a magnet. The discharge from the capacitors at 200 volts not lethal, but it does hurt a little.

I just want to state again that i need to find the permability of the inductor, that's it at this point. There are only a few unknowns, none of which effect the equation for the indutance. I need to find the inductance of the inductor, NOT the fireing coil. So please only respond if you can help me find the permability of the E core.