Re: 81" Continuous Arcs!

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi John,
I never consider a twin coil spark length as the length of two branches
meeting and
summing their meshed lengths together, but just simply each coils
individual spark
length ability.

Bart

Tesla list wrote:

> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<FutureT-at-aol-dot-com>
>
> In a message dated 6/11/01 10:18:30 AM Eastern Daylight Time,
> tesla-at-pupman-dot-com writes:
>
> >
> >  > Original poster: "Christopher Boden by way of Terry Fritz
> >  <twftesla-at-qwest-dot-net>" <chrisboden-at-hotmail-dot-com>
> >  > What is the longest realistic streamer length for a bipolar twin coil
> > system
> >  > at 10kVA 13.8kV?
> >
> >  With John Freau's NST formula 14.2 ft. With John's Potential Transformer
> >  formula 17.5 ft. So I'd say
> >  somewhere in between, and if your not hitting at least 14 ft., there will
> >  be some efficiency work to be done
> >  (These numbers consider 120 bps and in John's testing, less spark length
> >  for higher bps.  These are
> >  considered rather optimum spark length efficiency's. Although spark length
> >  can exceed these numbers,
> >  typically they don't).
> >
> >  Bart Anderson
>
> Bart, Chris, all,
>
> Twin coils give longer sparks than single coils for a given input
> power.  To calc the spark length for a twin, first take 1/2 the
> input power.  Use the formula on it, then double the result.
>
> Thus, for 10kVA,  1/2 of 10kVA = 5kVA.  The sqrt of 5000 =
> 70.71 x 1.7 = 120" or 10 feet.  Double this result to give the
> expected spark length of 20 feet for a twin.
>
> The reason that twins give longer sparks is because they must
> be thought of as two smaller coils each of half the power,
> each giving a spark length according to the formula.  The
> result is doubled since the sparks meet at the center.
>
> Cheers,
> John Freau