My experience is limited to 6" dia secondaries and smaller, but I have
found that maximum spark length strictly increases as top load size
increases, even as the topload minor dia exceeds the secondary dia. That
said, spark intensity diminishes with increasing top load size, a painful
tradeoff. I suspect that empirical data for top loads exceeding the sec
dia for larger secondaries is scarce as such top loads get expensive fast
and matching minor dia to sec dia just looks right and is known to work.
Regards, Gary Lau
MA, USA
On Mon, May 27, 2019 at 1:03 PM David Rieben <drieben@xxxxxxx> wrote:
> It seems from empirical data that the general rule of thumb, at least for
> fairly large coil systems, is that the top load’s minor diameter should
> closely match the diameter of the secondary coil and the top load’s major
> diameter should be pretty close to the length of the secondary coil.
>
> David Rieben
>
> Sent from my iPhone
>
> > On May 26, 2019, at 11:48 AM, undisclosed recipient via Tesla <
> tesla@xxxxxxxxxx> wrote:
> >
> > Just curious…
> > Has anyone noticed that the top-load outer ring diameter (top to bottom,
> not outer edge) matching the secondary diameter gives a better performance?
> > I built a 6” diameter secondary and wondering if using 6” semi-rigid
> pipe will do better than the 4” i have built.
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