Re: [TCML] Lacquer

[Phillip Slawinski <pslawinski@xxxxxxxxx>]

Andrew,

The thing on the floor could be considered a counterpoise, effectively
that's what it was when I used it.  The real reason I put it there was to
protect the coax cable running to a current transformer inside the box.  The
other end of the cable was connected to my rather expensive scope so I could
monitor primary current during the run. I'd rather not lose my scope due to
a stray streamer, so I put that ugly thing down on top of the cable near the
coil.  It might have been okay without that foil covered thing down there,
since the scope was running on a battery backup which was not connected to
the mains, but again, I didn't want to take chances.

-Phillip

On Fri, Apr 9, 2010 at 06:46, andrew <andrew@xxxxxxxxxxxxxxxxxxxxx> wrote:

> Hi
> Is that foil thing on the floor a capacitor or what? If so, how is it
> constructed?
> Kiwi Newbie
>
> -----Original Message-----
> From: Phillip Slawinski [mailto:pslawinski@xxxxxxxxx]
> Sent: Friday, 9 April 2010 2:17 a.m.
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] Lacquer
>
> Hi All,
>
> I too use the two-part epoxy coating on all my coils.  I built a coil from
> the ground up to produce a long spark length compared to the secondary
> length.  It has taken a lot of work, but I think the results were worth it.
> http://www.flickr.com/photos/pslawinski/4354745760/  During the process of
> developing this coil I have had multiple flash overs.
> http://www.flickr.com/photos/pslawinski/4309814799/  I haven't lost a
> secondary to a flash over or spark related event.  My secondary is wound
> with 34 AWG on a 12" x 3.5" form.  Not coating a form with such fine wire
> is
> simply not an option.  The wire is very fragile, and will break with only a
> mild amount of force, also with wire this fine expansion and contraction of
> the form due to temperature change will cause the windings to loosen up and
> fall down.  Sadly, I know this from experience.
>
> -Phillip Slawinski
>
> On Thu, Apr 8, 2010 at 08:22, Peter Terren <pterren@xxxxxxxxxxxx> wrote:
>
> > Firstly, the experiment with the conventional coil is not conclusive,
> > sorry.  Power was "about 20%" in the pre shot with racing sparks. No
> > mention of actual values for the post shot and the sparks look very
> > different on the pics.
> > I am not saying the result is wrong, but it is highly likely the
> > original power level was not reproduced.
> >
> > Secondly, DRSSTC's are different beasts in terms of coupling.
> > Obtaining better Watt's ratios (spark length/sec length) seems a lot
> > easier. 13:4 =
> > 3.25 does not seem remarkably efficient in this regard.
> > On the other hand using an SGTC coil with no special insulation, I
> > have Watt's ratios of 3.0 (96inches/32in).  Others have claimed larger
> > ratios for SGTC's but I have not seen clear photos to show this.  If
> > you want to follow this link copy and paste it into your browser.
> > http://tesladownunder.com/tesla_coil_sparks.htm#6 inch coil (the best
> > ones)
> >
> > Nevertheless, the previous discussion of using ?Envirotex as a very
> > thick layer does really seem to provide a lot of protection.
> > Some years ago I started a TC project to dramatically outperform this
> > 3.0 Watts number. A lot of special fabrication was done and I still
> > have everything ready to start some final plans and construction. One
> > day when I have a few moments........
> >
> > Peter
> >
> >
> >
> >
> > On 8/04/2010 1:16 PM, Dr.Hankenstein wrote:
> >
> >> Greetings,
> >>
> >> If you're not too sure on the effects of a good coating (or two or
> >> three) of varnish; please refer to a scientific evaluation on the
> >> following link:
> >>
> >> http://www.audiotesla.org/corona%20experiment.htm
> >>
> >> This should remove all doubt that varnish does more than just hold
> >> the winding in place and end the hypothetical armchair speculation. Dr.
> >> Spark has at least 80 coats of varnish on "Fatboy"---13+ footers out
> >> of a 4 foot secondary proves it:
> >> http://www.drspark.org/fatboy1_rebuild.htm
> >>
> >> Regards,
> >> Hank
> >>
> >>  _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> >
>
>
>
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