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Registered Member #511
Joined: Sat Feb 10 2007, 11:36AM
Location: Somerset UK
Posts: 55
Hi hydraliskdragon
470uF at 200V is 9.4J. You may want bigger capacitors! If you intend to use a small nail as the projectile then I would recommend no more than 100J per stage.
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
How powerful would it be able to project a toothpick sized nail at maximum charge?
Find the mass of your projectile and see how fast it will move if you manage to put 10% of the capacitor energy into it. (e = 0.5*m*(v^2), solve for v) That is the upper limit of what you can expect if you do everything right.
In reality a fast moving projectile makes it difficult to reach 10% efficiency and you should expect a significantly lower velocity for small projectiles.
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
I have 400V 470uf capacitors. One guy on instructables, used only 1 of these, and a 22 AWG, 12 layer coil 30mm wide, over a straw. It fires a metal 1 inch piece through a coffee can. Claims it has 6% efficiency. Each is .. 36.7 or 37.6 joules. I forgot which one :( If your interested, they still sell them.
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