synch with a pole pig coil (again)

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" <Tesla729-at-cs-dot-com>

Hi all,

I sent this letter out a couple of days ago and did not get any
response yet so I thought I would give it another go :^) here it is:



I'm in the process of replacing my lexan and brass
ARSG with a tungsten and G-10 SRSG. My coil system
is powered by a 14.4 kV 10 kVA pole pig ballasted thru a
Lincoln 225 amp arc welder. My primary capacitor is 0.0825
uFD and I was running ~ 300 - 350 bps asynch. I was wondering
how well the 0.0825 uFD cap would perform at 120 bps synch?
I don't think the 10 kVA transformer was able to fully charge
the capacitor before each discharge at 300 bps (Isn't it like
8 milliseconds to fully charge this 0.0825 uFD cap from the
impedance of the 10 kVA transformer?) Anyway, I know the
resonant size cap for this transformer is around 0.125 uFD
so will it be ok to run the synched system w/ smaller-than-
resonant (STR) primary capacitance? I know that the high
resonant voltage surges are not as big of a concern with
PTs or PDTs as opposed to NSTs or OBITs. Anyway, I
would appreciate any input from some of you guys who are
stronger in the math than myself :^) BTW, I was getting up
to about 10 ft. sparks from the coil running it the old >300
bps asynch way, can I expect similar or better results run-
ning 120 bps synch using the same transformer/capacitor
components?

Sparkin' again in Memphis after a 3 day blackout,
David Rieben