Re: [TCML] Spark gap for first TC

[DC Cox <resonance@xxxxxxxxxxxx>]

The very best for excellent performance from any nst powered system is a
hyperbaric gap --- formed from an old vac. cleaner motor.

Hyperbarics tend to give longer sparks due to the high turbulance in the gap
itself.

Email me off-list and I will send you a set of plans.

Dr. Resonance





On Sat, Feb 27, 2010 at 3:44 PM, <otmaskin5@xxxxxxx> wrote:

> I don't believe I got any replys on this question.  Anyone care to comment
> on the merits of a 2 parallel pipe spark gap vs. other single blown or
> sucker gaps for a 15/50 or 15/120 NST driven coil?  Thanks, Dennis Hopkinton
> MA
>
>
>
>
>
> -----Original Message-----
> From: otmaskin5@xxxxxxx
> To: tesla@xxxxxxxxxx
> Sent: Mon, Feb 22, 2010 9:41 am
> Subject: Re: [TCML] Spark gap for first TC
>
>
> Gary, is the two parallel pipe spark gap you describe as good as other
> single
> ap configurations, assuming you can deliver ample air flow.  I hear a lot
> about
> ingle gaps having lower losses & therefore higher efficiency than
> ulti-segmented gaps.  The two parall pipe set-up would be a single gap &
> seems
> uch easier to build than other single gaps I've read about.  I'd appreciate
> our or anyone elses thoughts on this.  Thanks, Dennis Hopkinton MA
>
>
> ----Original Message-----
> rom: Lau, Gary <Gary.Lau@xxxxxx>
> o: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> ent: Sun, Feb 21, 2010 9:56 pm
> ubject: RE: [TCML] Spark gap for first TC
>
> i Jim,
>  must admit that I'm also unclear about the finer points of constructing
> such a
> -log gap.
>  understand the basic premise - that adjusting the top/middle pipe adjusts
> the
> o intervening gaps, but I can't imagine an easy way to build this - how to
> spend the middle pipe such that the moving it stays parallel to the lower
> pes in both vertical and horizontal axes.  For simple, low-powered gaps,
> I've
> ways just had two parallel pipes side by side on a piece of G10, with
> rews/bolts and slotted holes in the G10 to the pipes.  At least the pipes
> main parallel in the vertical plane as I slide one of the pipes.  Is there
> a
> oto you can cite?
> hanks, Gary Lau
> , USA
>  -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of jimlux
> Sent: Sunday, February 21, 2010 10:57 AM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] Spark gap for first TC
>
> John Byström wrote:
> >
> >  jimlux wrote:
> >> Almost anything will "work".
> >> I like a gap made of three pieces of 3/4" or 1" diameter copper pipe
> >> about 2" long arranged with the long axes parallel.  So you effectively
> >> have 2 long skinny gaps in series.  You have a small fan blow air
> >> through the pipes (along the axis of the pipe.  If you arrange them in a
> >> sort of squashed triangle, you can permanently mount the two end ones,
> >> and adjustments only need to move the middle one.
> >>
> >> The other easy gap that works fairly well is a couple of copper pipe
> >> caps facing each other, with a shop vac blowing between them.
> >>
> >> You could even do the two bolts thing, but I've found that the bolt is
> >> so small  (even if you use carriage bolts and the gap is the head of the
> >> bolt) the spark always goes from exactly the same spot on the electrode
> >> and you get a hotspot.  Once you get that glowing hot spot, the gap
> >> characteristics change (it breaks down more easily), and the output of
> >> your coil drops.
> >
> > The first gap you mention, when I use the long side of the copper
> > tubes facing each other, how do you mean it would be (like a squashed
> > triangle)?
> >
> > I'm probably going to start with the "two bolt thing" because of the
> > time limit. If I have time left, I'll try another spark gap, like the one
> > you mentioned or the classic RQSG (I believe it's called)
> >
> >
>
>
> Imagine stacking three logs in a triangle.
>  O
> O O
>
> If you put the lower two tubes, say, 3/4" inch apart (actual gap, not
> center to center), then the upper tube can be used to adjust the gap
> width (you actually have two gaps in series).
>
> The small fan blows down the length of the tube (both inside and
> outside) so the cooling is really effective.
>
> YOu can also turn this on end and have the axes of the tubes vertical,
> which opens up some alternate mounting techniques.
>
>
> The RQ gap is similar.. but not so easily adjustable.  If you want to
> get into multiple gaps, then one of the "laid out flat" multiple gaps is
> probably better.  They're a whole row of tubes parallel to each other
> with a small fixed gap between tubes.  The gap is adjusted by chosing
> "how many gaps".
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