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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.)