Re: [TCML] max performance per secondary diameter/resonate inductor.

[Phillip Slawinski <pslawinski@xxxxxxxxx>]

Scott,

Yes, really 5.33333X.  See the video Cameron Prince took of my coil running
in his garage.  http://www.youtube.com/watch?v=5M1uBY87AAA  I hope to push
this even further sometime soon after I finish my new controller.  I should
mention that the coil in the video is a DRSSTC which holds a distinct
advantage over SGTC in terms of being able to extract more spark length from
a given secondary.  This advantage comes from the fact that I am able to
control the primary ring up.

As to the issue of racing sparks, I'm going to have to say your coil is
probably not immune.  There are several things that cause racing sparks.
There was a topic on the list a few months ago about probable causes for
racing sparks.  If you managed to get even 5X from a SGTC that would be
quite a feat.

-Phillip Slawinski

On Tue, Jul 20, 2010 at 00:43, Scott Bogard <sdbogard@xxxxxxxxx> wrote:

> Hi guys,
>        Wow, really 5.3x?!?!?  I don't think racing arcs are possible with
> my setup, it has a very thick coat of polyurethane and right now the primary
> coil is actually 1/4 in above the bottom of the magnet wire on the
> secondary, raising it higher lowers output but does not cause racing sparks,
> but like I mentioned I'm using a wicked break rate so that must help (I also
> think it is too wide with a center diameter of 5.5 inches for a 4 inch
> coil.)  One thing I did differently on this coil is the bottom and top 10 or
> so turns were done with 18AWG THHN, so I figured the extra insulation, wire
> diameter, and surface area from braided wire will keep currents busy in the
> wire and not allow leakage as corona, which in my mind should hinder racing
> arcs (if they aren't spawned from local corona then what causes them?)
>  Perhaps there is no benefit, but it sure makes connections easier and sort
> of looks cool!  Well I guess this means I'll need a bigger top load if I am
> to get any more out of it, I hope I have enough primary to pull this off,
> I've only one more turn before I need to add on.  My current top loads are a
> 4x15 and a 7.5x30, the next I have is a 12x34 (stove pipe toroid) and after
> that a 12x50 (truck tube toroid, probably too big for a 4 inch coil...)  In
> any event forget about my second question, I realized shortly after I sent
> it that adding a resonate inductor with the tank cap would be no different
> then heavily ballasting to bring the tank cap into resonance or LTR or
> whatever with the power supply, so it would increase "efficiency of
> available power" but drastically cut "available power" over no ballast, and
> thus certainly not improve spark length (nothing in life is really free I
> guess.)  Best case scenario (resonate inductor) I'd break even power wise
> minus DC resistive losses.  I suppose LTR will have to remain the domain of
> NST coilers using low break rates, or coilers with insane funds for coiling.
>  Thanks guys, in any event now I have to shoot for 5.4X, wow that is 104
> inches, I cannot imagine this being possible with 2 MOTs...  I guess I'll be
> happy with 2.7X for now.
>
> Scott Bogard.
>
>
>
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