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Re: top load height

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Hi Adam,
JAVATC can do up to a 10 toroid stack if you want it to (of course, it would take forever waiting for the data crunching time which really gets long when multiple topload objects are added). But, in light of your question, I can tell you with certainty that you will have to simply experiment to find out your coils ideal setting of those toploads (as far as spark lengths are desired). Javatc can tell you all the numbers (actual topload capacitance and how both toroids affect the coil electrically), but as far as best output off the top of the coil, nope, can't be done (at least not yet). Experiment is always required. Models help us to know the parameters better and hopefully prevent a design blunder, but ideal sparks? That is yet to be figured out. Anything remotely related to an ideal coil is always empirical. "Empirical", a word with meaning that John Couture used many times on this list.
As far as double stack toroids, Ed Sonderman ran a double stack back in 1995. He also threw in a large cylinder between the two stacks. Check this out! 
http://members.aol.com/esondrmn/index.html
Note Ed had the larger of the two toroids on top. He experimented at the time with both possible configurations with those two toroids. He found the larger toroid on top to be better. Ed achieved 6.8 foot sparks to a grounded object on this 6" coil. Pretty cool! 

Take care,
Bart

Tesla list wrote:


Original poster: Yurtle Turtle <yurtle_t@xxxxxxxxx>

Are these recommendations based on empirical evidence
(trial and error) or was modeling done. I have two
toroids for my coil, and am wondering if there's an
easier way than trial and error for finding the ideal
heights for both. While I have the ability to adjust
both, it's a bit of a pain that takes a while. The top
of my secondary is 80" high. To make matters more fun,
I can set my lower toroid where it needs to be, but my
larger upper one has to be raised to use, and lowered
to fit in my garage door.

I have a 10-3/4" secondary, a 6" x 24" and a 8" x 34"
toroids:

http://www.hot-streamer.com/adam/bigass_coil/coil09.jpg

Adam

--- Tesla list <tesla@xxxxxxxxxx> wrote:

> Original poster: otmaskin5@xxxxxxx
>
> Dr., when you say "base of the toroid," do you mean
> the lowest part
> of the toroid (which would be the underside of the
> cord) or the disc
> in the center of the toroid?   Dennis
>
>
> -----Original Message-----
> From: tesla@xxxxxxxxxx
> To: tesla@xxxxxxxxxx
> Sent: Sun, 1 Apr 2007 2:08 AM
> Subject: Re: top load height
>
> Original poster: "resonance"
> <resonance@xxxxxxxxxxxx>
>
>
> With magnet wire coils I usually space the base of
> the toroid
> (horizontal plane) 3 inches above the last secondary
> winding.
>
> With large PVC covered insulation on the wire, I
> usually set this
> distance at 6 inches.
>
> The larger the cross section of the torus the more
> height the coil
> will tolerate --- increased electrostatic shielding
> of the upper sec turns.
>
> Dr. Resonance
>
>  >Hi everybody,
>  > A quick question, is there any rule of thumb for
> determining > the
> proper height of your top load (toroids) from the
> top windings > of
> your secondary?
>  >It seems to make a differance in performance, but
> is there a way
> to >determine the optimum height (other than by
> sheer experimentation
> of >course!). Thanks.
>  >Scott Bogard
>  >
>
>
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