Re: [TCML] Sphere Topload Coil, RQ single blown gap

["Drake Schutt" <drake89@xxxxxxxxx>]

Hi Jim,

the spark gap on my coil is actually quite similar, but I haven't gotten
great performance out of my coil as of yet.  I used two 1/8" tungsten
carbide dremel bits for the electrodes which are epoxied into some brass
plumbing nipples.  The plumbing nipples have 1/4" male threads on the other
end which are screwed into 1/4" female pieces which are mounted on a piece
of scrap lexan.  this allows for the gap to be fine tuned from 0-1/2".  it's
quenched with a vacuum cleaner motor with a plastic hose attached to one
end.  it's pretty cool to watch the white plasma get sucked into the clear
hose!  The gap shows very little signs of wear and hardly gets above ambient
temperature during 1-2 minute runs.  It was quite easy to put together and
everything you need can be found at a local hardware store.  If anyone wants
pictures just send me an email because I doubt I did a very good job
describing it.


Drake Schutt

On Fri, Feb 22, 2008 at 12:13 AM, Jim Mora <jmora@xxxxxxxxxxx> wrote:

> Hello All,
>
> Richard Quick suggested a dual 1" brass dowel gap blown by a compressor
> (dowel ends are the gap). He is correct in saying it howls like a chainsaw
> with no muffler. The dowels are threaded for removal (the faces need 400
> grit from time to time to clean off any oxides) and for easy gap width
> adjustment.
>
> As you ramp up the voltage to the gap, you can hear the point where it
> really gets with it like a very loud 120 HZ square wave and the toroid
> comes
> alive.
>
> The gap works great up to 2KW. I was using a large leaf blower with a
> conical 12" polystyrene long nozzle that started at 3" and ended in the
> gap
> width diameter ~ .5" for 15KV and right next to the gap - high velocity,
> high pressure.
>
> Richard, if you are lurking out there again, thanks for the great gap!
>
> Jim Mora
>
> The design may still be in the archives. Easy to make, really works great!
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
> Of bartb
> Sent: Thursday, February 21, 2008 7:09 PM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] Sphere Topload Coil
>
> Hi David,
>
> I'm musing here as I haven't built a pressurized gap.
>
> The breakdown voltage itself of course increases with distance. Changing
> pressure will change the molecular density of the space between the
> electrodes. So, at high pressure, you can run a given gap distance at
> higher voltages than the same gap distance at whatever altitude would be
> normal atmospheric pressure. Now, if someone builds a pressurized gap
> using standard gap spacing (from experience with previous gaps), they
> might assume their firing at the same voltage when in fact it is
> probably higher. I'm not aware of a good comparative study between the
> two gap types discussed, but such a study would have to ensure identical
> power and firing rate.
>
> There may be more to a pressurized gap that I haven't accounted for, but
> from what I can figure, the air density in the chamber is a key
> difference. If a multi-gap was chambered similarly, then you have the
> added benefit of increased thermal regulation (which is what I was
> mainly trying to say).
>
> I personally love my high cfm vacuum RQ style cylinder gap using large
> segments, which I can run near 3 kva with just fine.
>
> Take care,
> Bart
>
>
> david baehr wrote:
> > wouldnt just simply widening the gap a bit do the same thing ??   well,
> i
> guess I just need to try one of these gaps someday ;-)
> >
> >        > Date: Thu, 21 Feb 2008 17:56:13 -0800> From:
> bartb@xxxxxxxxxxxxxxxx> To: tesla@xxxxxxxxxx> Subject: Re: [TCML] Sphere
> Topload Coil> CC: > > Hi David,> > Increased pressure increases the
> breakdown voltage and the air flow of > course aids cooling.
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