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Can't answer your question but had the thought that filling in the space
between the spokes by adding a disk of chicken wire or any other cheap
galvanized wire cloth would emulate a solid metal plate. Even cheaper
but ugly would be to use aluminum foil wrap, maybe supported by
corrugated paper sheet.
Ed
On 12/10/2017 2:22 AM, phil wrote:
All,
I'm currently assisting in the construction of a ring type toroid (60"
x 12") consisting of six tubes (
https://www.flickr.com/photos/33962508@N03/ ). Using Dr. Antônio
Carlos M. de Queiroz's 'Inca' program (
http://www.coe.ufrj.br/~acmq/programs/ ) and, along with some help in
its actual use from Bert Hickman, I now have a good idea of the
expected toroid's capacitance.
Now the six rings or hoops obviously need supporting in free space,
and the conventional toroid method is a solid central disc in the
horizontal plane supporting the outside minor diameter tube.
I wondered just how much this solid central disc contributes to the
shielding of the secondary, and if its replacement with support arms
(like wheel spokes - but only four of them at 12, 3, 6, 9 o'clock)
would leave the secondary more exposed to strikes, than if a solid
disc had been used?
(The effect on the capacitance value is believed to be small, so left
out of the decision.)