Re: VERY HIGH BPS at 6kw!

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

Original poster: "Peter Terren by way of Terry Fritz <teslalist-at-qwest-dot-net>" <pterren-at-iinet-dot-net.au>

Steven  see comments below for a similar coil.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, May 09, 2003 11:46 AM
Subject: VERY HIGH BPS at 6kw!


 > Original poster: "Steven Ward by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<srward16-at-hotmail-dot-com>
 >
 > Hi all,
 >
 > I built a 4 pack MOT supply and it works ok.  There is no limiting besides
 > the wires that come from the 240V outlet.  But thats not so
 > important.  This coil is running with a static sucker gap, and only about
 > .0475uf of capacitance.  In this scenario, the arcs SCREAM!  It sounds
like
 > 1000bps or maybe more!  The sparks are WHITE and hot when the arc to the
 > ground.  But, the coil is dissapointing with only 6-6.5 feet of
 > spark.  Also, the sparks will start downward, and end up vertical in the
 > air!  This is common for high BPS i guess.  But, i want about 9 feet or
 > more, so i need to lower the bps.  So, im thinking of making the cap in
the
 > .09 to .1uf range!  I know, this is HUGE.  Right now, im using 13 turns on
 > the primary (7"ID  23"OD
 > .25" cu) with a 6.5"x36" 24awg secondary and a 4.5"x30" toroid.  I know
 > that with that huge cap, i will only use a small fraction of those primary
 > turns.  But, just how BAD is this scenario?  Im basically limited to 9kv
or
 > so.
 > I do plan to eventaully (if a 5 turn primary works good for example)
 > make the primary from .5" copper or something bigger.  How bad will the
 > caps be stressed?  I have 3 strings of the geek type MMC caps, maybe 4 or
5
 > with the larger cap values (those nearing .1uf).  Are there any coils
 > similar to mine out there?  IF so, what is the typical output?  Id like 10
 > feet if possible.

  I am also using a 4 pack MOT with .048 uF geek type MMC without ballasting
on a 6.5 x 32 inch coil with 24G wire. I get 7 foot sparks but I use a
rotary gap rather than a sucker gap and have a much larger toroid(s) of 12"
x 29" upper and 8" x 20" lower.  To get 8 foot sparks I use 0.092 uF with
primary tapped at about 6 or 7 turns from memory. It is well behaved if
there is a breakout point.

Peter (Tesla Downunder) http://members.iinet-dot-net.au/~pterren/