Re: Pool Pig...

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "resonance" <resonance@xxxxxxxxxxxx>



If they are dual bushing xmfrs you could hook the secondaries of two 
in series for 14.4 kV output.    .06 to .07 uF cap size.

If you are starting from scratch, consider going to a 16 or 18 inch 
dia. for the sec coil, and perhaps a 64 inch overall winding length 
with 1,200 turns. The larger dia. gives you a higher potential 
difference due to the much larger inductance which increases as the 
square of the radius of the coil. You would probably end up with a 16 
AWG wire.  Just divide the 64 inch winding length by 1,200 turns to 
get the wire dia. required, and then look it up in a ARRL Handbook 
wire chart to get the correct wire size.

for best performance and quenching you will probably have to use a 
rotary type spark gap, perhaps 10 1/2 inch dia. electrodes spinning 
at 3450 RPM on a 12 inch dia. x 1/2 inch thick G-10 rotor with a 1/2 
or 3/4 HP motor.  The copper tubes may not take this power level very 
well which will result in poor quenching.

Dr. Resonance



> Original poster: <chipford@xxxxxxxxxxxx>


>  With all of this said, can I just build a say 8 1/2" dia. X 48" 
> secondary with about 1200-1400 turn of 20-24awg wire on it and then 
> lay down 10-15 turns of copper tube say 24" diameter 1/2" apart, 
> hook a couple of .03uf X 30KV maxwell caps in, hook it to my pole 
> pig, do some tweaking and create lightning? ;^P
>
> See attached photo...
> http://hot-streamer.com/temp/variac-0a.jpg
>
>
> ---- Tesla list <tesla@xxxxxxxxxx> wrote:
> > Original poster: G Hunter <dogbrain_39560@xxxxxxxxx>
> >
> > Hi Chip,
> >
> > The transformer / cap matching formulas often break
> > down when pole pigs are involved for precisely the
> > reasons you've just illuminated.  An optimal cap for
> > 7200vac at 2 amps is just too big.  It's not a big
> > deal.  Smaller-than-resonant caps are the norm at such
> > power levels.  Start off with about 50nF and
> > incrementally add capacitance until you get decent
> > sparks.  Maxwell Labs 30nF 30KV plastic caps go for
> > about $100 apiece on e-bay these days.  Try one or two
> > of those to start with.
> >
> > Cheers,
> >
> > Greg
> >
> >
> > --- Tesla list <tesla@xxxxxxxxxx> wrote:
> >
> >  > Original poster: "Chip Ford" <chipford@xxxxxxxxxxxx>
> >  >
> >  > Ok...there are many kinds of transformers out there.
> >  > Seems that the
> >  > really BIG coils use a pole pig. Such as "The green
> >  > monster". His is
> >  > a 15kva @ 14400 volts. Using the math KVA = ((VOLTS
> >  > X AMPS) / 1000),
> >  > I came up with an amperage of @ 1.042 Amps (15,000
> >  > watts). Since .001
> >  > Amps is equal to 1ma, he has 1042ma. According to my
> >  > calculations,
> >  > the resonant cap is @ .1919 uf. I think he said his
> >  > cap was
> >  > .1uf...close but not real close..Now, I think alot
> >  > of the line
> >  > transformers have a selector switch on them. I think
> >  > they are like
> >  > 7200, 6400, 5600 volts for the ones around here. So,
> >  > if I have 15 kva
> >  > transformer @ 7200 volts, it will have an amperage
> >  > of @ 2 amps
> >  > (2000ma)(15,000 Watts). At this rate, my cap is
> >  > gonna be around .75
> >  > uf. This is really high and from a few calculations
> >  > that I have made,
> >  > A secondary coil 12" 81/2" dia. 48" tall will need
> >  > over 10000 turns
> >  > of #39 awg. wire on it. This pretty much makes this
> >  > transformer
> >  > unusable. Besides that, where is a hobbest ever
> >  > gonna find a cap? Am
> >  > I missing something here? Are my calculations
> >  > incorrect? Am I looking
> >  > at the transformer incorrectly? Please
> >  > comment...Chip Ford
> >  >
> >  >
> >  >
> >
> >