[TCML] Questions on grounding
dexterlabs at dcemail.com
Wed Apr 22 03:34:54 MDT 2009
Bart and everybody,
Bit off topic question.
I have heard of the possibility so called "overquenched gap".
How strong must be an airflow through the static gap of a NST coil to observe the effect of the "overquenching"?
--- bartb at classictesla.com wrote:
From: bartb <bartb at classictesla.com>
To: Tesla Coil Mailing List <tesla at pupman.com>
Subject: Re: [TCML] Questions on grounding
Date: Tue, 21 Apr 2009 18:14:57 -0700
12" to 16" is good improvement.
Don't increase the spark gap. All this will do is increase the breakdown
voltage and can kill the NST. A new gap would be good and the hyperbaric
gap (linked the drawing in a post last week) is probably the easiest to
build. It's basically a PVC T-fitting with copper pipes inserted into
the ends along with a brass fitting on each end. The air is forced up
through the center hole in the T-fitting. For your 12/30 NST, you can
max out at about 27", so another 11" is about all you can expect out of
the 12/30 on a perfect day. I think in order to achieve that or even
come close, a new blown gap would be needed. That's up to you of course.
If you do end up adding a 2nd 12/30 NST in parallel with the 1st NST,
then you basically have a 12/60. Max length is about 38" with this
setup. However, your cap would be very near NST resonance and it would
be best to throw a little more capacitance into the gap if you think
about doing that (about 0.018uF to .02uF is what you want with a 12/60).
The toroid may actually be too big, not too small. Install a breakout
point (anything you come up with will do). I have a 1 meter aluminum
ruler that I use for a breakout point and I simply lay it on top of the
toroid when I use it. This will allow the spark to breakout more
consistently and it helps direct the spark to one side of the coil.
Actually when your testing spark lengths against a ground wire or
object, try using a breakout point as it gives a precise measurement and
you will get far more strikes to the object. The breakout point can be a
wire, a ruler, a rod, and some even go as far as to attach a 1/2" to 1"
metallic sphere to the end of the rod. The rod should protrude out past
the toroid edge by about 5 to 10 inches on your toroid size.
I don't think you need to lower the toroid at all. If the bottom of the
toroid is 2" above the secondary, then it should be fine where it is.
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