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Forums
4hv.org :: Forums :: Electromagnetic Projectile Accelerators
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Need help with first good coil gun.

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Arcstarter
Sat Apr 05 2008, 05:27PM Print
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
I get the theory of operation,but i need help with the amount of turns to use. I have a 15000 uf capacitor charged to 50 volts. That is 18.75 joules. How many turns of wire should i have for a nail about 3 inches long and mabey .25 inches thick(i am horrible at measurement). I might at some point use two 6000uf caps in parallel with the 15000 uf cap giving 27000 uf at 50 volts.That is about 33.75 joules. How many turns should i start out with and then increase or decrease according to were i get the best performance?
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Lakeowner
Sat Apr 05 2008, 06:25PM
Lakeowner Registered Member #1370 Joined: Mon Mar 03 2008, 09:01AM
Location: Finland
Posts: 56
Test it :)
You won't need too much turns because voltage is so low. Try start with few tens of turns and then decrease count.
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Arcstarter
Sun Apr 06 2008, 03:50AM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Thanks alot! I guess i have already gotten to peak performance out of it. I used like 6 turns and a got a nail to shoot about 2.5 yards.
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FireBird
Sun Apr 06 2008, 11:00PM
FireBird Registered Member #1104 Joined: Tue Nov 06 2007, 07:38PM
Location: Wisconsin, United States
Posts: 34
I would recommend putting the caps in series because otherwise you will end up getting a lot of suck back. The coil gun should be designed so that the charge has dissipated once the projectile gets to the middle of the coil. More voltage will allow you to push more energy through the coil faster (then you can add more turns also to get more of the energy to transfer to the projectile).
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