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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

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Subject: Tesla Digest, Vol 15, Issue 33

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