Re: Terry's DRSSTC - Experiment - A curious thing...

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Mr Gregory Peters <s371034@xxxxxxxxxxxxxxxxx>

Terry,

I actually used to notice this on my ASRSG coil. Hence many of my earlier 
posts (years ago) advocate the use of ASRSGs with very high BPS. In fact, I 
recall suggesting that 600 was the minimum, with about 750-800 seeming 
"just right" for my system. These very high breakrates seem to work real 
well with short stubby coils, ala Richard Hull. I was rubbished at the time 
for suggesting that an async gap could ever compare to a sync gap, but it 
can and does, provided the system is set up right. A well quenched static 
gap in series with the rsg is needed to maintain efficiency. My experiments 
suggested that quenching is of far more importance in asrsg systems than in 
srsg systems. But, as per usual, this is an observation and I can't back it 
up with the models and proper theory, except to say that the current draw 
dropped by 1/3 for the same amount of spark.

Perhaps your "computer coil" is now able to show this because your solid 
state spark gap can provide the "quench" necessary, and most earlier 
experimenters didn't obsess over quench times the way I did.

I see many MOT coils on the web these days with asrsg. These low voltage, 
high current systems would do especially well with a series static gap. And 
by this, I don't mean some stupid copper pipe gap with a fan blowing on it. 
I mean a gap where the electrode face is blown by a 100 psi stream of air 
from a real compressor.

Some points: 1) I rarely read list posts now, so I'm not sure what has been 
going on for the last few years. No flaming please. Just happened to catch 
this one. May seem really dumb, so go easy.

2) If you want to try some asrsg experiments, make sure you can verify the 
BPS. Use a hall sensor to measure mechanical BPS, and an optical for actual 
BPS.

3) Make sure your mechanical dwell period is under 100uS by using 
appropriately sized rotors and electrodes.

Cheers,

Greg Peters
Department of Earth Sciences,
University of Queensland, Australia
Phone: 0402 841 677
http://www.hot-streamer.com/greg2



----- Original Message -----
From: Tesla list <tesla@xxxxxxxxxx>
Date: Wednesday, April 13, 2005 1:17 pm
Subject: Re: Terry's DRSSTC - Experiment - A curious thing...

> Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>
>
> Hi All,
>
> I tried my experiment and found something very odd!!
>
> I was running small streamers (~8 inches) here in the basement off
> a sharp
> tip on the terminal.
>
> The 1, 2, 3... pulse thing did not seem too interesting.  After
> about 5 to
> 10 pulse the streamers seem to reach a maximum level.  After that
> they just
> last longer but their length does not increase....
>
> But one thing that certainly did get my attention was this.
>
> After about 400 BPS and certainly from 600 - 1000 BPS the streamer
> length
> "cyclically" goes from a small brushy discharge to a long single
> streamer
> as a function of BPS.  Sort of like this:
>
> 500BPS = short sparks
> 550BPS = long single arc
> 600 BPS = short sparks
> 700 BPS = long single arc
> .
> .
> .
>
> Those are not really the exact numbers, but just increasing the
> BPS say
> from 660 to 690 increased the length of the streamers about 5X!!
> Then
> increasing the BPS further to 720 made the streamers fall back to
> the short
> discharge again!  It is almost like the streamer length is going
> through
> nodes and anti-nodes as the BPS is increased.
>
> I don't "think" it is anything in the electronics.  There is
> nothing to
> really cause it on the controller side.  I just used 20 pulses all
> the time
> at fixed pulse width (35mS) so the total power is pretty much the
> same.  Only the BPS rate of the 20 pulse bursts was changed.
>
> I was wondering if the L and C of the streamer was resonating or
> something.  But I could not imagine how that could be...  It
> certainly did
> seem like the long streamers "go in and out of tune"....  You
> could adjust
> the BPS to maximize the length....
>
> If it is a real repeatable effect, it may have been easily lost in
> a
> conventional spark gap type coil's erratic operation.  The DRSSTC
> with
> computer control can easily pick out this effect.  I can change
> the BPS
> from like 700BPS to 701BPS without changing any things else and
> run like
> that for hours!  It is really strange running coils by computer!!
> But the
> level of control and repeatability is astounding!!
>
> So curious if anyone has ever noticed streamer length dramatically
> coming
> and going buy changing BPS a little at the above 600BPS level?
>
> Cheers,
>
> 	Terry
>
>
>