Hi Kuba,
There's nothing wrong with adding a sphere atop a toroid. However, the
incremental capacitance of the sphere, assuming your image is to scale,
will be rather small, as the shape of the toroid will shield the field from
the sphere. I think just adding an extra primary turn would probably have
a greater impact at lowering Fres than the added sphere.
If you're shooting for the maximum spark length, I think the size of your
toroid needs to be up'ed considerably. With my 15/60 NST, I use a 7x30
primary toroid with a smaller corona ring toroid spaced beneath it, to gain
additional height for the main toroid. With top loads, bigger is _always_
better.
I didn't completely understand the geometry of your gap. I don't think
there's any good reason to try to contain the gap arc. PVC, and
particularly rubber (!), will suffer rapidly from exposure to the UV
radiation of the gap. I think the gap will generate the same amount of
ozone whether or not it's contained, assuming that the air is circulated
and not sealed, and you DO want good circulation. And in any
well-performing coil, the sound from the top load sparks will be much
louder than the sound of the gap, so no point in trying to muffle it. I
would recommend a sucker gap - it's been widely tested and is easy to
construct and adjust. See http://www.laushaus.com/tesla/onegap.htm
Hope this helps,
Regards, Gary Lau
MA, USA
On Sun, Feb 16, 2014 at 8:03 PM, Kuba Anglin <kubaanglin@xxxxxxxxx> wrote:
> Hello,
>
> I have been working on a Tesla coil design for the past month now and am
> about ready to order the parts.
>
> My main questions:
>
> -Are there any issues with my design?
> -Is it OK to have a toroid and a sphere as the top load? I am only doing
> this because these two pieces equal the required capacitance level of
> around 29pF (see the TeslaMap image for more info).
> -I was planning on creating a vacuum static spark gap by putting the
> electrodes inside a PVC pipe sealed with rubber sheets and lexan board. The
> vacuum pump would suck out the air to limit resistance caused by the air,
> lessen ozone production, and reduce noise. Does this sound like a good
> idea?
>
> I have added a 3D render of my design and a filled out TeslaMap page. I
> will be phasing two NSTs to achieve the right amperage. Check the TeslaMap
> attachment for more specific specs.
>
> 3D render link: http://s13.postimg.org/q9tpxzsjb/Tesla_Coil.jpg
> TeslaMap link: http://s9.postimg.org/t0ss08wmn/Tesla_Map_Page.jpg
>
> Here is my parts list:
>
> Secondary Coil6.625" PVC Pipe 3'22 AWG Magnet Wire 5lbs wound 34"
> highToroid
> 18" x 4.5" + Sphere 7" diameterPrimary Coil3/8" Copper Tubing 60' 11
> turns1/2"
> Copper tubing 10' strike railBase(2X) 15 KVA 60mA Transformer(2X) 1" Brass
> Electrode
> 72 Capacitors (.15uF 2kV each) 4 strings of 18(2X) Brass Bolt
>
> Thanks,
> Kuba Anglin
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
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