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RE: [TCML] Still stuck at 36"
I've built two that I used both as sucker and as blown gaps. Both seem to run much better as sucker gaps on the two coils I've used them on. I used one on a 4" coil, and the other on my 10" coil.
http://www.classictesla.com/hot-streamer/adam/shopvac_gap.jpg
I don't have a photo on the other one I made, but it has a lot more copper than the attached.
Adam
--- On Sun, 1/25/09, Lau, Gary <Gary.Lau@xxxxxx> wrote:
> From: Lau, Gary <Gary.Lau@xxxxxx>
> Subject: RE: [TCML] Still stuck at 36"
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Sunday, January 25, 2009, 1:54 PM
> Hi John,
>
> I don't recall if I made a careful performance
> comparison between the sucker and vortex gaps. At the time
> I was changing a lot of things on my coil, and probably
> since spark measurement is so subjective, I chose to just
> focus on the more quantitative gap loss measurements, which
> were unequivocal. See
> http://www.laushaus.com/tesla/vortexgap.htm
> So unresolved is whether quenching differences between
> sucker and pressurized gaps might offset the lower losses
> seen in the blown gaps. But if I had to guess, I would
> guess that the blown/vortex/hyperbaric gap would have
> superior performance. It's just a bit more difficult to
> build than a sucker gap.
>
> Regards, Gary Lau
> MA, USA
>
> > -----Original Message-----
> > From: tesla-bounces@xxxxxxxxxx
> [mailto:tesla-bounces@xxxxxxxxxx] On
> > Behalf Of futuret@xxxxxxx
> > Sent: Sunday, January 25, 2009 1:08 PM
> > To: tesla@xxxxxxxxxx
> > Subject: Re: [TCML] Still stuck at 36"
> >
> > Theoretically, a sucker gap may work better if built
> as a pressurized
> > gap.
> > In such case it won't be a sucker gap of course.
> > Dr. R's hyperbaric gap is probably a pressure gap,
> not a sucker
> > gap. After all, the word "hyperbaric" means
> "higher than normal
> > atmospheric pressure. By using a pressurized air gap,
> this should help
> > reduce gap
> > losses since pressurized air breaks down at a narrower
> gap setting
> > than lower pressure air. Also pressurized air should
> quench better
> > than lower pressure air. Just run the vacuum motor in
> reverse
> > to produce the pressurized air. This is the concept
> Gary Lau
> > used in his vortex gap. I remember that Gary used a
> sucker
> > gap at first then switched to the vortex pressurized
> gap, but
> > I don't remember if he saw a noticeable
> improvement in
> > spark length. Perhaps Gary will comment.
> >
> > John
> > --
> >
> >
> > -----Original Message-----
> > From: Phil Tuck <follies@xxxxxxxxxxxx>
> > To: tesla@xxxxxxxxxx
> > Sent: Sun, 25 Jan 2009 4:07 am
> > Subject: [TCML] Still stuck at 36"
> >
> >
> >
> > Hello.
> > If you do go for a sucker gap as Dr R suggests, the
> 'normal' distance
> > for a
> > gap may not always apply. After some head scratching I
> found out that
> > the
> > vacuum that is created, alters the normal spark
> distance. (I'm now
> > using 10K
> > / 100ma on a 192 thou or 4.9mm gap)
> >
> > If I forget to start the suction (semi-industrial vac
> cleaner) my gap
> > will
> > only start if the Variac is set around 220 volts
> (I'm UK based at
> > 240volts)
> > , whereas with the suction on, it will start at about
> 130 volts and you
> > can
> > go as low as 90 volts running. I found you need good
> suction, vac
> > cleaner or
> > leaf vacuum cleaner (not a leaf blower) If you build
> it bigger than you
> > need
> > you have capability for adding another NST as well.
> :-).
> >
> > Phil
> >
> > -----Original Message-----
> > From: tesla-bounces@xxxxxxxxxx
> [mailto:tesla-bounces@xxxxxxxxxx] On
> > Behalf
> > Of tesla-request@xxxxxxxxxx
> > Sent: 25 January 2009 05:09
> > To: tesla@xxxxxxxxxx
> > Subject: Tesla Digest, Vol 15, Issue 33
> >
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