secondary diameter vs. toroid minor diameter

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Bill Vanyo by way of Terry Fritz <twftesla-at-qwest-dot-net>" <vanyo-at-echoes-dot-net>

Someone once recommended to me that the toroid minor diameter be
slightly smaller than the secondary diameter, the idea (roughly) being
that breakout is more likely to occur where radius of curvature is less,
and you obviously don't want breakout from the secondary.

Make sense?

For my next coil (slow in progress), I have a 9" by 30" spun aluminum
toroid (the last bulk buy), and am planning on using a 10.75" diameter
PVC secondary form.  Reasonable?  What diameter secondaries are others
using with those toroids?

(FWIW - power will be a bank of 15/60 Franceformers, up to 6 of them;
cap will be up to 9 strings of 11 Geek Group caps, 9 strings being
0.122uf; and gap will probably be triggered (maybe synch rotary, though
haven't started on parts collection for that yet))

	- Bill Vanyo