Re: 81" Continuous Arcs!

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <FutureT-at-aol-dot-com>

In a message dated 6/11/01 9:13:51 PM Eastern Daylight Time, tesla-at-pupman-dot-com 
writes:

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

Bart,

You bring up a good point.  I understood that the 10kVA was
the total power for both coils, and that each coil would use
5kVA.  But if Duck meant that each coil was 10kVA for a
total of 20kVA, then the total spark length across both coils
would be about 28 feet or so, or 14 feet streamers from each
coil as you said.

John Freau

>  
>  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
>