Can you tell me the optimum sized toroid I should have?
On Mon, Feb 17, 2014 at 4:15 PM, Scott Bogard <sdbogard@xxxxxxxxx> wrote:
> Hi Kuba,
> One other thing to consider, if you lower the air pressure in there
> with a vacuum pump, the pump MUST be disconnected when the coil is running,
> and it must be valved off with a GLASS or PLASTIC valve. Otherwise the
> entire cavity can become ionized, and an electrically conductive trail will
> travel to your vacuum pump, and all your tank energy will go straight to
> ground, through you pump. You will cook the pump, perhaps sooner, or
> perhaps later. I work with plasma balls and such, I use a grounded metal
> gas manifold to prevent this, anytime you are live filling it will try to
> escape to your pump potentially. If you are worried about Ozone, run the
> coil outside, or build a sucker or blower gap, and vent the exhaust
> outside, don't try to contain it, because then a leak can result in lethal
> levels of it escaping. Higher pressure in the gap is better as it will
> encourage the arc to extinguish, which is paramount for coil performance.
> Also I didn't look at your top load design, but I know Tesla map
> recommends top load size based on quarter wave, which has been proven to be
> nonsense. I love Tesla map and use it regularly, but size your top load
> using this formula. C in pf=A*SQRT[input watts] (A=0.5-0.9, higher gives
> longer sparks, lower gives multiple healthy streamers). This WILL result
> in a top load that looks too big, but modern experimentation shows a "too
> big" top load is the best for making big sparks. Just some food for
> thought, have fun experimenting!
>
> Scott Bogard.
>
>
> On Mon, Feb 17, 2014 at 4:23 AM, Kuba Anglin <kubaanglin@xxxxxxxxx> wrote:
>
> > Thanks for your response,
> >
> > Sorry I was not very clear on my spark gap design. Here is a rough
> rendered
> > image of what it will look like. A vacuum pump will suck the air from the
> > tube to lessen the air resistance for greater control over the spark gap
> > and limit ozone production for obvious reasons.
> > http://s29.postimg.org/t4o3jgapz/spark_gap.jpg What do you think? Is it
> > worth the benefits?
> >
> > Thanks,
> > Kuba Anglin
> >
> >
> > On Sun, Feb 16, 2014 at 6:46 PM, Gary Lau <glau1024@xxxxxxxxx> wrote:
> >
> > > 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
> > > > _______________________________________________
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