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Spark Strip Help!!!

A place to ask general spud cannon related questions.
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Unread postAuthor: starman » Thu Dec 11, 2008 11:58 am

jimmy101 wrote:Flames don't like to propagate through gaps. Too much surface area for the volume, resulting in too much heat loss. As I said, even the very small upper electrode of a spark plug gives a noticable shadow in the flame front. A gap is going to be much worse.


Since the rod is buried in the PVC, not cemented on top of the strip, I see no reason to think that the odds are much better the flame will equally choose to propagate through the bottom side as well as the top side.

I'm actually giving the whole spark strip concept more thought and may present something here in a few days.
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Unread postAuthor: Xxplosive42o » Thu Dec 11, 2008 4:38 pm

Im running into problems... I'm using an electric AAA battery powered igniter and if I'm correct the steel spark strip is going to give off too much resistance for the spark's to be quite effective if at all. I'm looking into locating some copper rod which might work. Dunno... I like the idea of a stun gun, its just is very very ugly IMO unless you encase it into a hobby box. My ignitor was going to be conceiled completely into one of my handles with the switch conveniently placed at your index finger.
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Unread postAuthor: Xxplosive42o » Thu Dec 11, 2008 11:50 pm

I just drew up an idea of a spark strip. It would be a 1"x 14" strip of plastic with a 1"x14" segmented piece of copper on each side consisting of 1/4" gaps between each piece of rectangular copper. It would have the postive/negetive pols on each side using #6 3"bolts to reach the approximate center of the chamber. The spark would occur on each side of the strip and arc sparks around the girth of it creating a long rod of pure electric fun! :P

Tell me what you think boys!

Image[/img]
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" Forget about all the reasons why something may not work. You only need to find one good reason why it will. "
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Unread postAuthor: starman » Fri Dec 12, 2008 2:00 am

Xxplosive42o wrote:I just drew up an idea of a spark strip. It would be a 1"x 14" strip of plastic with a 1"x14" segmented piece of copper on each side consisting of 1/4" gaps between each piece of rectangular copper. It would have the postive/negetive pols on each side using #6 3"bolts to reach the approximate center of the chamber. The spark would occur on each side of the strip and arc sparks around the girth of it creating a long rod of pure electric fun! :P

Tell me what you think boys!


This strip isn't going to work like you think it will. The spark will decide to take one side or the other but not both. Also, 1/4" gaps are way too large in a multigap system. You'll need to keep the sum of all gaps smaller that the "saftey" gap on the stun gun itself. Keep your gaps as small as possible. A large gap doesn't provide any advantage.
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Unread postAuthor: Xxplosive42o » Fri Dec 12, 2008 3:47 am

Sounds good, thanks for all your imput so far :-)
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