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Re: first non NST coil questions

Original poster: BunnyKiller <bunnikillr@xxxxxxx>
When I was running my BIGPIG coil on forced air gap, I began having quenching problems at about 40 amps draw on a 240 line feed...ehhh approximately 9.5 - 10 kVA. The gap was 2 @ 1/4" dia. tungsten electrodes inside a 2" PVC pipe driven by my 1.5 HP shop vac...( yupperz the industrial sized unit) the arc would extend about 2" beyond the electrodes. Once I started pushing the pig beyond 40 amps, the streamers would get shorter and erratic in output. I switched over to a rotory gap and still need something better.... the arc will jump to the electrodes and follow them for about an inch pre, during and post direct line up. Having it run like this extends my active arc time quite a bit... but Im getting 10 - 15 foot streamers depending on weather moon phase if the tree is leafy or not... :) 

Scot D



Tesla list wrote:


Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>

Hi Justin, all,

I'm not sure what the "magic number" is to where
the power levels become too great for forced air
cooling alone to adequately quench a spark gap.
However, I do think that there comes a point to where
it's more practical and economical to just upgrade to
a quality rotary gap than to employ the draconian mea-
sures that would be required to properly quench an
air cooled stationary gap system. IIRC, Richard Hull
used to state that anything over 3 kVA required a
rotary gap but I think there are a few coilers that have
built successful RQ style gaps running power levels
up to 5 or 6 kVA. IMHO, with really large coils (>
10 kVA) it is sometimes necessary to use a combi-
nation of rotary and air cooled stationary gaps in series
to help commutate the generated heat. That's what I do
with my Green Monster that runs as high as 15 to 20
kVA power levels and Cameron Prince also does this
with his large coil.

http://www.teslauniverse.com/members/drieben/
http://www.teslauniverse.com/gallery/v/coils/polepig/

My $.02,
David


----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, March 22, 2007 10:05 PM
Subject: Re: first non NST coil questions


> Original poster: Justin <rocketfuel@xxxxxxxxxxxxx>
>
>
> Hi Jared,
>
> What do you mean by high power levels?  A friend in town showed me his
> design which he claimed could withstand 5kVA pretty well.
>
>
> Justin
>
>
>  > Original poster: "Jared Dwarshuis" <jdwarshuis@xxxxxxxxx>
>  >
>  > Hi: Justin
>  >
>  > It is nearly impossible to get high power levels to quench with a
sucker
>  > gap.
>  >
>  >
>  > Sincerely: Jared Dwarshuis
>  >
>  > "If Tesla coils are outlawed, only outlaws will have Tesla coils"
>  > "They will get my pole pig when they pry it from my cold dead fingers"
>  >
>  >
>