Tesla Coil toroid Size

To: tesla-at-pupman-dot-com
Subject: Tesla Coil toroid Size
From: "John H. Couture" <couturejh-at-worldnet.att-dot-net> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
Date: Fri, 04 Sep 1998 23:49:24 -0600
Approved: terryf-at-verinet-dot-com


  To All -

  In the past several coilers have said that increasing the size of the
toroid increased the output spark length. Did they understand what their
tests were telling them?

  The toroid capacitance is found in the equations

  Vs = sqrt(2J/Cs)  Vs = Vp sqrt(Cp/Cs)  Cs= Ccoil + Ctoroid

  These equations indicate the output voltage (Vs) or spark length would
decrease, not increase, if the Cs (toroid capacitance) was increased.

  Any comments regarding this apparent contradiction with theory? How would
you or do you determine the optimum toroid size for a particular TC design?
It is obvious that changing the toroid size affects the spark length as
proven by tests.

  John Couture

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