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

["Jim Mora" <jmora@xxxxxxxxxxx>]

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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