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Re: NorCal Teslathon -- Interesting Devices and Effects
Original poster: "Kennan C Herrick by way of Terry Fritz <twftesla-at-qwest-dot-net>" <kcha1-at-juno-dot-com>
The better/more-common the grounds the more this kind of thing will be
seen to happen. It's nothing more than EM coupling of 1 coil to the
other. When they're near enough in Fr & near enough together it can
happen. And it will be much more evident before spark break-out since
that's when the "sending" coil is radiating the most EMF.
Ken Herrick
On Wed, 18 Jul 2001 13:03:40 -0600 "Tesla list" <tesla-at-pupman-dot-com>
writes:
> Original poster: "Basura, Brian by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <brian.basura-at-unistudios-dot-com>
>
> Greg/Bart/Others,
>
> Ross Overstreet and I had similar experiences a couple years ago.
> When I
> slowly brought up the power to my coil Ross' coil started making
> arcs even
> though his was shut off. Ross' arcs continued to increase in length
> until I
> had the power high enough to achieved breakout on my coil. At that
> point
> Ross' arcs diminished somewhat but persisted during the run of my
> coil.
> Discussions on the list at that time tended to think the common
> daisy-chained ground was playing a part in the phenononum. Both of
> our 6"
> coils were running at approximately 150khz (+-10khz), were separated
> by 12'
> or so, and shared a common ground. Here is a picture of the setup we
> were
> using (circa February 1999)
>
http://fp2.hughes-dot-net/brianb/images/Tesla/Pictures/022099/ross-basura1.jp
g
>
> We also witnessed this same effect during the 1999 SC Teslathon (to
> the
> surprise of a couple coilers who approached their coil while it was
> de-energized but another coil was running). At this time we were
> using a
> common ground point with some coil grounds daisy-chained. The coils
> were
> also much closer together.
> http://fp2.hughes-dot-net/brianb/newpage11.htm
>
> I was not aware of this happening at the 2000 SC Teslathon. There
> were two
> changes which could have prevented it from occurring. First the
> coils were
> spaced much further apart. Second, we had installed an extensive
> multi point
> ground system where all the ground rods were tied together and a
> large
> ground buss ran by each coil. There were no daisy-chained grounds I
> was
> aware of. http://fp2.hughes-dot-net/brianb/2000.htm
>
> Not sure this is of any assistance but I thought I'd share it.
>
> Regards,
> Brian B.
>
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Wednesday, July 18, 2001 7:08 AM
> To: tesla-at-pupman-dot-com
> Subject: Re: NorCal Teslathon -- Interesting Devices and
> Effects
>
> Original poster: "Barton B. Anderson by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>
>
> Hi Greg,
>
> Tesla list wrote:
>
> > Original poster: "Greg Leyh by way of Terry Fritz
> <twftesla-at-qwest-dot-net>"
> <lod-at-pacbell-dot-net>
> >
> > Original poster: Barton B. Anderson
> >
> > > Out of curiousity, do you know the approximate power level you
> were
> running
> > > at and the
> > > proximity of Kelek's coil to your's? This must have really blown
> some
> minds
> > > when it was first
> > > noticed.
> >
> > Indeed... when I first closed the contactor and saw Kelek's
> > coil light up, I immediately shut down and glanced over at
> > her control table... no one was there! Then I noticed that
> > her rotary gap was not spinning, either. I had to stop and
> > ponder this for a moment, then remembered that her coil runs
> > somewhere around 60kHz, from a rough measurement we had made.
> > My coil usually runs around 61kHz.
> >
> > I applied power again, but still couldn't believe that it was
> > possible to couple that much power over that distance... even
> > as I was watching her coil generate a 6ft arc!
> >
> > The effect was most pronounced when my coil was running at a
> > low power setting with almost no breakout, around 13 kW. As
> > the power level increased above 50%, the streamers on Kelek's
> > coil would start to diminish. My first guess is that the
> > operating freq of my coil decreases far enough at full power
> > (due to the increased C of the arc and the ion cloud) that the
> > tuning match becomes skewed.
> >
> > The center-to-center distance between the two coils was about
> > 25 feet. Given the typical 5oo W/ft arc length number and
> > a typical coil efficiency of 60%, it would appear that about
> > 15oo to 18ooW of power was coupled between the coils, in order
> > to produce the 5 to 6ft induced arc. But then again it might
> > actually require far less power than this to produce a 6ft arc.
> >
> > Any guesses on the coupled W/ft required to produce a 6ft arc
> > in this fashion?
> > --
> >
> > -GL
> > www.lod-dot-org
>
> Well, no. 6 foot arcs should be about 1800W, but as far as coupling
> a 25
> foot distance, no
> clue. Other list members would have a better idea than I would.
>
> Reading your post here, brings the CS Notes to mind. By accident,
> your coil
> and Kelek's
> produced the same phenomenon Telsa discovered with the same
> requirements
> (prevent streamer
> loading, tuning to the same Fr, etc..). Someone brought up a really
> good
> point earlier asking
> if the grounding piont was tied to the same point (guessing yes).
>
> It would be good to repeat this again some day if at all possible.
> Should
> the event occur
> again, I'll bring a 61kHz coil with me.
>
> Take care,
> Bart
>
>
>
>
>
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