Re: [TCML] Strike Rail Hits Was: Stacking vs Large Diameter

["David Rieben" <drieben@xxxxxxxxxxx>]

Hi Bart,

Cameron Prince uses a flat ribbon primay design
for his primary on his big coil, too. It would have
been easier for me to employ the flat ribbon if I
had started the design with a flat ribbon primary 
to begin with, as "retroing" from a copper tube
design back to a flat ribbon design would pret-
ty much require a complete dismantle and reas-
sembly of the system. It's funny too, because 
sometimes I can hurl multiple streamers for
a minute or so non-stop without hardly a 
single primary primary strike and then the
next 30 seconds the streamers may hit the
primary area 30% of the time! They seem to
do what they want to do ;^)

David Rieben


----- Original Message ----- 
From: "bartb" <bartb@xxxxxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Monday, July 14, 2008 9:13 PM
Subject: [TCML] Strike Rail Hits Was: Stacking vs Large Diameter


> Hi David,
>
> I'm in the process of building a ribbon primary. The ribbon is 1" x 
> .035" x 50ft. I'm building this for the SISG coil (since I'm waiting on 
> more diodes as I decided on full bridge capable of 60kV rectification). 
> The inner diameter to outer diameter thickness will only be 3.5 inches. 
> I plan to use fiberglass runners and Plexiglas ring over the top of the 
> ribbon to further prevent those unwanted hits. This will make for a very 
> compact primary. My reasoning here is that I simply don't want primary 
> hits with an SISG coil, so I'm doing this to further eliminate the 
> possibility.
>
> Something like this might be really good  (and cool) for the Green 
> Monster 8-) . Remember Bill Wysocks Griffith Park Observatory coil? Or 
> the Mini-GTO? http://www.ttr.com/Fry-coil.htm. 5th picture down shows a 
> closeup of the primary. I think this is the same ribbon I have.
>
> I've gone through some pics of ribbon primary construction, and of all 
> I've seen, a simple standoff like what Bill used seems to be the best 
> solution in my book. I tried the insertion between turns using various 
> things like 1" foam, rubber, etc., but I've come to a conclusion that 
> simple standoffs like Bill used is better for cosmetics, reuse, etc. It 
> takes a little more work to cut the standoffs, but to me it's worth it.
>
> Anyway, just thinking that the Green Monster might benefit from such a 
> primary?
>
> Take care,
> Bart
>
>
>
> David Rieben wrote:
> > Hi Phillip,
> >
> > Well, you've seen firsthand what can be done with single large
> > diametered toroids in both the big coils of Cameron Prince and
> > myself ;^) There are a lot of variables to consider that would
> > make it nearly impossilbe to give you a definitive "yes or no"
> > answer to your question. The main advantage that many taught
> > with the double stack toroid design is the better E field protec-
> > tion for the reduction of primary/strike rail hits. I might could
> > personally reduce some of the strike rail hits from my Green
> > Monster coil by installing a smaller "bottom toroid" underneath
> > the large main unit, although it starts to become nearly impossible
> > to completely eliminate primary/strike rail hits at these power
> > levels with the physical size limitations that I am dealing with.
> >
> > --
> > David Rieben
> >   
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