Re: Caps...insidious caps
You certainly are prolific in your postings...
On Sun, 18 Apr 1999 14:07:19 -0600 Tesla List <tesla-at-pupman-dot-com> writes:
>Original Poster: "christopher boden" <chrisboden-at-hotmail-dot-com>
>I know there's some kind of formula for this but I can't figure it
>out and you guys can do this in your sleep....
>What is the required/recomended cap size and values for...
>1. Project 1.. a 15KV 30mA NST powering a 4"X25" secondary to produce
>the largest possible discharge.
resonance is .00530516477.......uf. But it seems that many people get
better results with as much as twice this value.
>2. Thor.....a 5 or 10 KVA Pig (14.4KVAC?) into a big coil (does the
>sec. size matter? we have 2 options)
In regards to the sec. size, I would have to say, Yes! Go with large
diameter PVC of polyurethane coated cardboard sonotube.
>I've seen coils wound with copper strip (as big as 4") laid vertical
>for the primaries...I would think this is the best possible
>setup..better than tubing. But wouldn't the shape of the primary
>conductor (a vertical strip helix) promote arcing and corona loss
>with the thin edge?
>As I would understand it direct arcs to the primary are a Bad Thing
>but this would seem to be much more efficiant.
Coppper tube seems a better choice for new coilers.
>Just had an epiphinae...or an apostophe...one or the other...
>What about an Air core (dielectric) cap? I have HUGE amounts of space
>for this project (dedicated rooms and all that) what about 2 sets of
>stacked plates (maybe as big as 3'X3'X1/4") arranged on edge with
>Lexan holders or something. In the event of breakdown it would just
>arc across the plates and everything would be cool.
>This would be the single most indestructable type of cap I can think
>of. The biggest problem would be stabilising the plates to keep them
>from touching, this I can do. Anybody know what size and how many
>plates I would need and what to make them out of?
>Has anybody ever done this before?
Yes. i remember visiting a web page.... sorry I havn't the url. I have a
copy of the html, no pics, and this is an unauthorized copy.... but:
"This capacitor is made with several metal plates stacked up on yellow
wire nuts as spacers. I stack the plates so they are off
set about 3/4" on the ends, every other plate. The off set allows a place
to attach the alligator clip wires so they won't arc to
the other plates. I have had very good luck with this capacitor compaired
to the glass caps and salt water caps. There is
very little energy lost in this capacitor. The main disadvantage is its
large size but its very easy to assemble. You can have
metal plates cut to size at any heat and air conditioning shop and the
price is very reasonable. During Tesla Coil operation
there are sparks that sometimes jump between the plates. Sometimes a
spark will jump through a wire nut and create a
carbon track and short out the capacitor. I have tried wooden spaces in
place of the wire nuts and have had trouble with
arcs burning a carbon track along the side of the wood. PVC pipe spaces
works the best but take a lot of time to make.
This is a very efficient capacitor and produces very powerful output
sparks from my Tesla Coil."
Did they live?
I'm fairly sure...
>This could be really cool...finally an indestructable cap....with
>it...I could RULE THE WORLD (cue evil laughter). Well.....maybe at
>least impress a girl....yeah, that works.
>Have fun guys, and don't get dead.
You could even -gasp!- produce enough ozone to knock yourself out!
>Christopher A. Boden
>The Geek Group
>344 Ionia SW
>Grand Rapids MI
>The Geek Shall Inherit the Earth!
With silent lightning in my hand,
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