Re: NorCal Teslathon -- Interesting Devices and Effects

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

Original poster: "Greg Leyh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <lod-at-pacbell-dot-net>

Original poster: Barton B. Anderson

> Out of curiousity, do you know the approximate power level you were running
> at and the
> proximity of Kelek's coil to your's? This must have really blown some minds
> when it was first
> noticed.


Indeed... when I first closed the contactor and saw Kelek's 
coil light up, I immediately shut down and glanced over at
her control table... no one was there!  Then I noticed that
her rotary gap was not spinning, either.  I had to stop and
ponder this for a moment, then remembered that her coil runs
somewhere around 60kHz, from a rough measurement we had made.
My coil usually runs around 61kHz.

I applied power again, but still couldn't believe that it was 
possible to couple that much power over that distance... even 
as I was watching her coil generate a 6ft arc!

The effect was most pronounced when my coil was running at a
low power setting with almost no breakout, around 13 kW.  As
the power level increased above 50%, the streamers on Kelek's
coil would start to diminish.  My first guess is that the
operating freq of my coil decreases far enough at full power 
(due to the increased C of the arc and the ion cloud) that the 
tuning match becomes skewed.

The center-to-center distance between the two coils was about 
25 feet.  Given the typical 5oo W/ft arc length number and
a typical coil efficiency of 60%, it would appear that about
15oo to 18ooW of power was coupled between the coils, in order 
to produce the 5 to 6ft induced arc.  But then again it might 
actually require far less power than this to produce a 6ft arc.

Any guesses on the coupled W/ft required to produce a 6ft arc 
in this fashion?
-- 


-GL
www.lod-dot-org