Hi Terry. I just completed a 10"x47" ring toroid earlier this year:
https://labs.cobaugh.io/hv/tesla/10x47-ring-toroid/
I will say that this toroid is extremely light for its size. Maybe
10lbs or so, possibly less. Probably a third of the weight of my old
corrugated pipe toroid that was only half the size.
If you want to go the 3D printed route, or just want to have something
CNC cut to your specifications, I can provide 3dstep files to use
as-is or modify.
On Tue, Jun 9, 2020 at 4:56 PM Terry Oxandale <toxandale@xxxxxxxxxxxxx> wrote:
>
> Thanks Doug, but looking for a possible terminal cap in the 10" x 40" or bigger. Built a new COVID-19 version coil, and am guessing the current 8x34 will work well, but bigger may be better. I'm thnking of getting my toes wet on this type of design.
> Ox
> On Tuesday, June 9, 2020, 03:45:54 PM CDT, Douglas Johnson <doug379306@xxxxxxxxx> wrote:
>
> Hey Terry, I have 2 copper coil toroids, one is 2,5" by 9" the other is 3"
> by 9" that I would sell for $35 each plus $10 shipping.
> Pictures on demand!
> Doug
>
> On Tue, Jun 9, 2020 at 2:50 PM Terry Oxandale <Toxandale@xxxxxxx> wrote:
>
> > Thanks Carlos. I knew I'd seen some postings about it, but had no idea on
> > where to begin to find them.
> >
> > -----Original Message-----
> > From: Tesla <tesla-bounces@xxxxxxxxxx> On Behalf Of Antonio Queiroz
> > Sent: Sunday, June 7, 2020 8:28 PM
> > To: tesla@xxxxxxxxxx
> > Subject: **External Email** Re: [TCML] Toroid efficiency tube vs spun
> >
> > Em 07/06/2020 18:17, Terry Oxandale escreveu:
> > >
> > >
> > > I've seen various designs for toroid construction (spun, multiple
> > tubes-loops, conductive film/covering, etc), and have yet to understand
> > electrical differences in the traditional continuous-surface toroid, versus
> > the multiple tubular-loop ones.
> > > Assuming the same minor and major diameters between the two (or what one
> > would consider that for the tubular one), I would think that variability
> > exist in total capacitance or field differences between the two, especially
> > in terms of the number and spacing of the individual tube-loops to each
> > adjacent tube-loop. Does anyone have knowledge of the frequency/spacing
> > relationship that would garner electrical equivalence between the two, or
> > is that not feasible to say one could never perfectly match the other in
> > terms of breakout/capacitance/field characteristics?
> > > Terry
> >
> > The capacitances of a smooth toroid and of a toroid made with tubes, with
> > the same outer shape, are almost identical. The breakdown voltage of a tube
> > toroid is always smaller. There was some discussion about this in the list
> > years ago, with simulations.
> >
> > Antonio Carlos M. de Queiroz
> >
> >
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andy
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