I'm unaware of any formulaic derivation for the number of turns. I think
it's strictly anecdotal reports of what is seen to work.
For the number of primary turns, when there are very few turns, the
inductance is low and that causes primary, and more importantly spark gap,
currents to go up. Gap losses then go up. At the upper extreme, lots of
primary turns become physically unwieldy. For the primary on my 15/60
coil, I think I have it tapped at 17 turns, but it could go to 22 if need
be. But to keep the size in check, I made it two-layers.
I'm not sure what the constraints on secondary turns are. Anyone else?
Gary Lau
MA, USA
On Thu, Feb 2, 2017 at 5:14 PM, Guape Sinnelag <amn1t3@xxxxxxxxx> wrote:
> I feel ya on the slippery slope. If you seen the first rendition of this
> coil.... lol. I found a very long term hobby. Since I posted I have ran
> into a 12/30 setup on pupman for capable 42" spark I will try out
> eventually. But I still am stuck on the thought of lots of windings. When
> does the number of turns become overkill? I hear 800 to 1000, or 8 to 12,
> and seemingly universal no matter size. Then I read about 1600 for low
> power. Is there some good reading or a good explanation on this?
>
> On Feb 1, 2017 8:44 PM, "jimlux" <jimlux@xxxxxxxxxxxxx> wrote:
>
> > On 2/1/17 4:15 PM, Gary Lau wrote:
> >
> >> Hi Guape,
> >>
> >>
> >> point of arcing, I would recommend using a cylinder gap made of copper
> >> pipes, that arc along the length of the pipes. There is some debate
> over
> >> using multi-segment gaps or single segment gaps. I favor single segment
> >> gaps with a vacuum cleaner motor to move a lot of air - construction and
> >> adjustment are easier and I believe losses are lower in single segment
> >> gaps.
> >>
> >
> > parallel segments of copper pipe work really well.. they cool well,
> > they're easy to adjust. I like three segments in a triangle.. the two
> > "outer" segments can be bolted down, and you can adjust just the one
> > between them to get the gap spacing and even-ness right. That middle
> piece
> > is "floating" electrically.
> >
> > But, two pieces of pipe works well too.
> >
> >
> >
> >
> >> 4. Bigger IS Better on all TC components.
> >>
> > <snip>
> > But be warned -
> >
> >> step 4 is a slippery slope and you may embark on a never-ending quest of
> >> constant upgrades.
> >>
> >
> >
> >
> > Oh my, ain't that the truth...
> >
> >
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> >
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