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Re: Need help maximizing sparks - quick!
Original poster: "Finn Hammer by way of Terry Fritz <twftesla-at-qwest-dot-net>" <f-hammer-at-post5.tele.dk>
I typed your numbers into my _Registered_ (hint!) copy of Wintesla *,
using the following values:
Secondary = 4" by 28" 1100T 18.77mH, 9.13 pF
Topload = 4"diametre tubing with 16" outside diametre = 23.35 pF
Primary cap = 14.7 nF (=1 string of 15 pcs. 0.22µF caps.
This should give you good tuning if you tap the primary at 10.6 turns.
I would use the 12kV transformer to start with, since it will be able to
"pull" a slightly larger cap.
Start running the coil with the bottom turn of the secondary approx 1
inch above the primary coil. This will provide a low coupling, more
tolerant of poor tuning.
* Wintesla is written by R. Scott Coppersmith, but I found a copy here
at G. Weavers design page.:
Hope this helped
Tesla list wrote:
> Original poster: "Patrick Leonard by way of Terry Fritz
> I am supposed to present my coil this coming friday, so I quickly need to get
> my TC tuned for maximum spark output (and maximum audience impressing :) I
> have a variety of components but I'm not really sure how to combine them to
> produce the maximum spark lengths possible. I'd love if you guys could
> some advice.
> Power: 12/30 nst or 15/30 nst <--which ever would work "best" with my other
> Primary: 15.5 turns of 0.25" copper tube, spaced 0.25" with 6" ID.
> Secondary: I have two. Both wound on 4" PVC. One is 28" wound with #28
> other is 24" wound with #24 AWG <--which ever would work best with my other
> Spark Gap: RQ style, no cooling.
> Capacitor: I have mananged to obtain some MMC caps (thanks a lot). They are 2
> strands of 15 caps each. Each individual cap is .22uF at 1250VDC. Based
> other components what would be the best arrangement?
> Toroid: Please help here....what size looks appropriate?
> I'm sort of a newbie here and I don't have the empirical knowledge or
> mathematical know-how to come up with the best arragnement of the components.
> I'm sure I should be able to obtain 3' - 4' arcs, but I have no idea how.
> Thanks a lot,