RE: Outdoor performance problems
---------- Forwarded message ----------
Date: Mon, 12 Jan 1998 10:41:16 -0700
From: "Wysock, William C." <Wysock-at-courier8.aero-dot-org>
To: tesla-request <tesla-request-at-pupman-dot-com>
Subject: RE: Outdoor performance problems
To: 'Tesla List'
Subject: Outdoor performance problems
Date: Sunday, January 11, 1998 9:31PM
From: Robert W. Stephens[SMTP:rwstephens-at-headwaters-dot-com]
Reply To: rwstephens-at-headwaters-dot-com
Sent: Sunday, January 11, 1998 5:56 PM
To: Tesla List
Subject: Re: Outdoor performance problems
> To: "'Tesla List'" <tesla-at-pupman-dot-com>
> Subject: Outdoor performance problems
> Date: Sun, 11 Jan 1998 13:52:45 -0600
> From: Tesla List <tesla-at-pupman-dot-com>
> From: Jeff W. Parisse[SMTP:jparisse-at-teslacoil-dot-com]
> Sent: Sunday, January 11, 1998 10:50 AM
> To: Tesla List
> Subject: Re: Outdoor performance problems
> >I had my coil running really well indoors (snip) and when I put it
> (38o F, moist) I got some puzzling problems
> >Seems like temperature was affecting something.
> The moisture in the air, not the temp, was causing your sparks to be
> shorter. Moist
> air is more conductive than dry air and therefore sparks dissipate faster
> a moist,
> conductive environment.
> I've seen tapes of Robert Stephens on very cold (yet dry) Canadian winters
> his coils with tremendous results.
> Jeff W. Parisse, Director
> kVA Effects
Adam, Jeff, All,
I just have to jump in here and respond to set the record straight.
In my own experience, and this has been proven by dramatic
demonstrated results, both indoors and out, many many times over, that my
disruptive TC's produce their greatest streamer length when the humidity is
very high and is like you see sometimes, just swirling around in the
air as a mist of microdroplets. Yes it's absolutely true!
Adam, Jeff, All
This thread continurs.....
There is another possibility to explain what the difference between
this coiler's indoor and outdoor results were. It has nothing (or at least
very little,) to do with RH, or barometric pressure. Consider the
[actual] operating environment between the indoor and outdoor
physical settings. There may be a significant difference that "the
virtual ground plane" offers in these two settings. In the case of the
coil sitting on a concrete floor inside a shop or house, as compared
to sitting outside on a lawn or driveway, this may not be the case.
However, if the indoor operation was say, on an elevated wooden
floor which might easily be several feet above the ground, the resonant
point on this coil could easily change by the amount that was seen;
especially if the Q of his coil is fairly high.
In the case of my Model 10 coil (circa 1982,) when I operated on a concrete
floor at Universal Studios Stage 27 for SPFX filming, as the coil was placed
adjacent to two right angle walls at 35 foot spacing, (the walls were
on the inside face with poultry netting [chicken wire] to hold sound
absorbtive insulation in place,) this coil gave its best-ever discharge
length of 27 feet straight line measurement, with a single corona point
on top of the 4 foot diameter toroid. The arcs were white-hot power arcs
that went straight up to the overhead lighting grid. When this coil was
moved to another side of this indoor stage (this was the stage where
"The Posiden Adventure" was shot,) this same coil diminished in its
output to less then 15 feet! The culprit? The floor; and attentive ground
plane coupling changes. In the first location, the floor was rebar enforced
concrete. In the second position, the coil had been moved over a steel
framed and wooden planked pit, (the location for the underwater
shipwreck scenes.) The re-tuning of the primary (almost 1.5 out of
4 turns total,) brought the coil back to its full performance, except that
there were no vertical adjacent walls for the secondary to load against.
All this showed that as a 4 foot by 1 foot toroid top load, it was actually
too small for optimizing that coil.
It has long been my experience that when you have a large size/high
power coil, or even a mid-sized coil (that has a high Q where if the
primary tap point is changed even 1/8 turn, the output drops
dramatically,) the resultant environmental changes that will be seen
from one operating location and condition to another, become more
readably observable. Wysock's corollary to Murphy's Law: "Things
are not what they appear to be."
Tesla Technology Research