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Re: [TCML] Still stuck at 36"



Just an $.02, I found that I didn't want to run my vac motor at 120VAC, I got less spark length that way. I put a variac on the vac motor to control speed, got my best sparks at about 80VAC or so IIRC.

Oh, was a vac gap, not hyperbaric. MAde a HUGE performance gain for my 15/60 NST coil.

Jonathan
www.madlabs.info
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----- Original Message ----- From: <futuret@xxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Sunday, January 25, 2009 10:07 AM
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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To: tesla@xxxxxxxxxx
Subject: Tesla Digest, Vol 15, Issue 33

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