Re: Dwell time, etc

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: dest <dest@xxxxxxxxxxxxx>

/7puBeT, John % )

> Original poster: FutureT@xxxxxxx

> Horasho.... OK.

whoa! i knew that it wasn`t so hard as some people were thinking : )

>>let`s see the probability of such scenario in real life.
>>the gap will start to break not when the electrodes are fully
>>aligned - sooner, probably at a distance about of one gap electrode
>>thickness  (the gaps were both flat - stationary and flying ones),
>>or even  sooner.

> There may be a delay in the gap breakdown due to the air swirling
> around in that area.  I'm not sure.

it would be very advantageous to have this delay, the more - the
better, but how can we control this?
unfortunately the coin have two sides as always - the positive effect
is increased air pressure in front of flying electrode. this gives
higher breakdown voltage, higher plasma density - less losses,
requisite time shift/delay. negative effect is decreased air pressure
behind of flying electrode - this will provoke reignition.
what should i do to have max of "+" with min of "-"?

> But Ed Wingate obtains quenching on the 1st notch at full power on
> his magnifier.

is that coil from Terry Blake`s ("Death Cage", "Inside of Cage of
Death") videos, with badly corrugated foil toroid onto small spun
aluminium one? these are good news, coz quenching at high k`s is more
(time wise) difficult, so if Ed has managed this - we all must try to
do the same or better, right? % )

> During the initial tuning of the coil, the sparks may have been
> weak.  This would have made the gaps run hotter and may have made it
> seem that a more elaborate gap system was needed than was actually
> needed.

probably. trying to cope with bouncing back and forth 60KVA may be even
lethal % )

>>as for 8 electrodes in series - probably somewhere in the end of '96
>>Greg had been spoken about some of his rules of the thumb - 5kv at one
>>gap maximum

> I have my own rules of thumb.  I use two gaps for up to 30kV.
> Maybe things need to change at higher powers.  I have no idea.

yeah -  rules of real big thumb probably : )

> In any case it's good that you challenge and question things.  It
> prevents bad myths from developing.

sorry, but i can only ask questions yet - no acces to real hardware -_-
so i want to ask about this:

"Date: Sun, 12 Oct 1997
[...]
I remember on one coil, I used 1/4" electrodes and I got thumping in
the pole tranny and the system drew 16 amps.  When I went to an
"offset" method that effectively reduced my dwell time to zero, the
thumping went away, and the current dropped down to 13 amps, but spark
length remained the same.  Break-rate was about 600 presentations per
second.
[...]
John Freau"

what was that ""offset" method"?

-----
... If all else fails... Connect another (better if it would be brand
new : D) storage scope across it! : )