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Re: PFC Question

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

Bart,

That's a very well worded explanation of the STR
cap use for pig systems and I couldn't have explained
it that well myself :^) I have ran into a fellow coiler in
Maine via email that's running 120 wine bottle salt
water caps for his pig powered coil, though! I'm not sure
what the total C of that would be but even at 3 nFd
per 750 ml bottle as a conservative "guestimate", that would be
a whopping .36 uFd! He is also running a SRSG with it so this
would kind of dictate LTR for maximum efficiency. And the
amazing thing is that his SRSG is basically one of the
Terry Blake "propeller" style with what looks like
maybe 1/2" stailees steel "acron" cap nuts to take the brunt
of the dischagre energy and this is in sereis with an RQ
style stationary gap. He's ran this at over 20 kVA
and obviously the acorn nuts take one heck of a beating
in a pretty short order but he says that the nuts are
easily changable. I would have hard time believing
that he could run under these parameters but he sent
me some pics of his setup with the 120 wine bottles
and all and some estimated 12 to 15 foot discharge
photos as well. I can't send them to the Tesla list
since it won't accept attachments but if anyone would
be interested in seeing them I supose I could send
them directly to Terry and let him load them to hot
streamer_? BTW, dosen't Kevin Eldrege's BIGGG
coil use an SRSG as opposed to asynch? I also
remember that his primary C was around .17 uFd.
Quite large, but still not LTR for his monsterous
system.

David Rieben


----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, November 08, 2005 10:40 PM
Subject: Re: PFC Question


Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Hi Mike,

Excellent question.

In my opinion, the reason has to do with cost of caps and super gaps, initially. As an example, I'll use my old pig coil. It has changed dimensions through the years (and no longer exist as Tesla coil). The last configuration was approximately 12.75" x 46", 1070 turns of #18, and with my 10kva pig, 12.4j max bang energy as I ran 0.06uF at near 9 turns with the top load I used. For this coil and my pig, if I were to go LTR (and we can be certain it would be LTR for an RSG), then my cap would calculate to 0.333uF. Thus, my max bang energy would be 69j, Yipes!!!

So, now you must consider:

1) Can the secondary take it? (all of sudden, I have a vision of smoke and fire!)
2) What type of gap would be required to handle that kind of energy? (a really, really, BIG ONE!)
3) How much would the caps and all cost me? ($$ I feel sick just thinking about it)

These are a few of the many issues to consider, but they are real. To put it simply, it's not in the arena for the garage coiler, and thus, we "typically" run in STR mode.

Take care,
Bart