Re: 4.5 inch coil upgrade

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

Original poster: DRIEBEN-at-midsouth.rr-dot-com 

Steve,

You're really starting to come along in your coiling :^)
Yea, you could probably do better than 38" sparks from
a 12/60 NST power source but it would take some pretty
extensive "tweeking" to get it from my personal experi-
ence. John Freau and John Mora(?) spelling? have obtained
around 38" to 42" spark lengths with only a 12/30 NST
but not too many coilers are able to obtain that degree
of efficiency from their medium powered coils. If you
can get you a 10" or 12" secondaried coil built and
running, you can power it with that 10 kVA pig that you
got from me and get some 10 to 15 footers ;^))

Take care and keep 'um sparking,
David Rieben

----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
Date: Friday, April 23, 2004 9:19 am
Subject: 4.5 inch coil upgrade

 > Original poster: "steve" <steve_vance-at-cablelynx-dot-com>
 >
 > Hi List, I just got done upgrading my 4.5" coil. I changed the
 > transformerfrom a 12-30 nst to a 12-60 nst. Added a strike rail,
 > and changed my caps
 > from homemade to a mmc. I am getting streamers about 38" long now.
 > I think I
 > should get more though. I think the problem is the coupling. The
 > secondaryis 4.5" and the primary hole is 8" According to javatc
 > the coupling is .1 k.
 > My question is: If  I add two more turns to the inner part of the
 > primaryand raise the outside 14 deg. to make it an inverse
 > conical, the coupling
 > should increase to .146 k. Will this increase the streamer length
 > enough to
 > justify the modification? Is 3/4" enough clearance between the
 > primary and
 > secondary?
 >
 > You can see the coil here.
 > http://fire.prohosting-dot-com/~bonestc/4.5inchcoil.html  The photo at the
 > bottom of the page is with the new setup.
 >
 > Steve Vance
 >
 >
 >