[TCML] Topload design questions

[Jim Mora]

Hi Karl,
My dual 15/60 8" coil has a 4x12 right at the top and a 32x8 slightly above.
I tuned it with a scope and it worked great right out of the gate. Most
sparks were straight out or upward. I never had a trace of racing sparks and
coupling was near k=.13
Jim Mora

-----Original Message-----
From: tesla-bounces at pupman.com [mailto:tesla-bounces at pupman.com] On Behalf
Of Karl Thorkildsen
Sent: Friday, January 02, 2009 9:35 AM
To: tesla at pupman.com
Subject: [TCML] Topload design questions

First off, Hello!  I've been lurking for a while and have gained a 
huge amount of knowledge by reading hundreds of posts here.  I have 
built a couple of coils and am working on a third.  This will be run 
off two 15/60 NST's.

My question is about topload configurations.  I understand the need 
to have a toroid in close proximity to the top of the secondary to 
avoid corona discharge from the upper part of the primary.  But if 
using two toroids, can the upper (and larger) toroid be elevated a 
few inches on a conductive rod without adverse side effects?

For instance in my case I'm considering a 6.5x30 inch secondary, with 
a 3x12 and a 4x18 toroid and raising the 4x18 by 6 inches.

Why, you might ask?  Well, I originally thought of this as a way to 
reduce primary strikes, but I now realize this might only be valid 
under certain conditions.  Another consideration is that it would 
look cool.  But in the end I'm now just curious what the effect and 
ramifications might be.

Thoughts?
- Karl

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