[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: [TCML] Still stuck at 36"
I can't back any of this up with experimental evidence, but I would guess that a pressurized gap would exhibit worse quenching than a sucker gap. I base this on experiments that Terry did years ago, comparing a single segment gap to a multi-segment gap. The multi-segment gap showed superior quenching, but higher losses.
I suspect that things that stretch out or cool the gap plasma, like keeping it in contact with as much and as many pieces of metal as possible, tend to enhance quenching - the extinguishing of the arc. I'm guessing that the shorter, more conductive arc in a pressurized gap would be more difficult to extinguish than one stretched out further.
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 3:51 PM
> To: tesla@xxxxxxxxxx
> Subject: Re: [TCML] Still stuck at 36"
>
>
> Hi Gary,
>
> Well the gap loss improvement alone of the pressure gap would make it a
> superior design, yes.
> I would think the quenching would be better too on the pressure gap.
> So I don't see one factor as offsetting the other, I see the factors as
> being additive in a positive way. At least that's what I seem to
> remember;
> that higher pressure causes better quenching.
>
> I made a mistake in my last posting. I meant to say that the air
> pipes have to be connected to the opposite side (the pressure side),
> rather than the vacuum side, of the vacuum motor unit. And as you
> said,
> this makes it a little harder to construct, but probably worth the
> effort
> I would think.
>
> John
> --
>
>
> -----Original Message-----
> From: Lau, Gary <Gary.Lau@xxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Sent: Sun, 25 Jan 2009 2:54 pm
> Subject: RE: [TCML] Still stuck at 36"
>
>
>
> 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
> >
> > Send Tesla mailing list submissions to
> > tesla@xxxxxxxxxxxxxx
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
> > http://www.pupman.com/mailman/listinfo/tesla
> > or, via email, send a message with subject or body 'help' to
> > tesla-request@xxxxxxxxxxxxxx
> >
> > You can reach the person managing the list at
> > tesla-owner@xxxxxxxxxxxxxx
> >
> > When replying, please edit your Subject line so it is more specific
> than
> > "Re: Contents of Tesla digest..."
> >
> > No virus found in this incoming message.
> > Checked by AVG - http://www.avg.com
> > Version: 8.0.176 / Virus Database: 270.10.13/1914 - Release Date:
> > 24/01/2009
> > 20:40
> >
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> >
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla