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Safety gap issues

Original poster: "JT Bowles" <jasotb@xxxxxxxxxxx>

Either I have constructed such a safety-perfect circuit, or my safety gap is being dumb.

I added a grounded middle node, and now it NEVER fires.(I think i saw it fire twice in a couple minutes of operation). Whats the deal? I am using my RF ground, the same one attatched to my secondary. I spaced the safety gap JUST over what the main spark gap is set at. So, whats the deal? could by ground be so used up that it is actually repelling a spark in my safety gap?

- I measured , with a ruler, it to be 8000 volts across the Saf. gap.
-my main spark gap is set up at around 7300 volts (also measured with a ruler device)
-my xformer is a 12,000 volt output *should I even worry about this*

Honestly being owned by my coil,
JT Bowles


From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: SIZE of RF chokes?
Date: Sun, 20 Nov 2005 16:42:20 -0700

Original poster: "JT Bowles" <jasotb@xxxxxxxxxxx>

YOU SAID
:  "I happen to be the guy who created that formula.  I use 140 volts
into the NST.  This permits the NST to draw more than it's rated
power.  Besides the formula is a guide, not an absolute limit. "


OH, HOLY CRAP. SORRY ABOUT THAT. DIDNT KNOW. Alright then, maybe you can help me in the future, I need to go right now


From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: SIZE of RF chokes?
Date: Sat, 19 Nov 2005 17:56:36 -0700

Original poster: FutureT@xxxxxxx

In a message dated 11/19/05 5:25:50 PM Eastern Standard Time, tesla@xxxxxxxxxx writes:


You said:
  "You may be pleased to hear that my TT-42 coil which gives 42"
sparks from a 12/30 NST, does not use any filter.  I just use
safety gaps."

42 inches cant be correct. According to
the......universal......sparklength formula, you should only get a
max of 37"  (  1.7*sqrt inputpower ) in watts )



I happen to be the guy who created that formula.  I use 140 volts
into the NST.  This permits the NST to draw more than it's rated
power.  Besides the formula is a guide, not an absolute limit.


By the way now I hate your guts, considering you're using the exact
same transformer as I, but getting.......3 times more power coming
out. I dont realllly hate you but...you get the idea



Ho, ho,  I see what you're saying.  We'll I'm sure you'll obtain the
performance and safety you're looking for.


With my current system in place, I get 9 to 11 inch discharges to the
air, and when i add a breakout point, pointed at a grounded rod - I
can stretch it to 15.5 inches

thats a total efficiency of about 50%

OK, but using just a safety gap is BS, i saw your site dude. You use
a terry filter. NOt to mention, just because your coil performs good,
doesnt mean it will last forever. I am very happy with 15" discharges
if I could get my coil to last..... 5 or more years. I care less about power. 


You're telling me that I use a terry filter?  How could you come to that
conclusion?  It is a false statement.  I don't use any filter on that coil.
It's true my coil may not last as long as it would with a filter.   If you're
concerned more about having the coil last a long time and don't
care about getting the longest sparks, that is fine.  A filter
won't hurt the performance too much anyway.  I'm not telling
you that you should avoid the filter.  Filters are fine and very
protective.  I was just mentioning that I don't use a filter.

Please don't send me any photos, although I appreciate the
offer.  I just don't have time....overloaded by emails already.

John