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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