RE: Air blast SG question

["Lau, Gary" <Gary.Lau-at-xxxxxxxxxx> (by way of Terry Fritz <twftesla-at-xxxxxxxxxx>)]

Hi Luc:

Regarding my assertion that the gap breakdown voltage is largely independent
of airflow, I may have given an answer that is not true for all types of air
blast gaps.  For the two single static gaps that I have built, they are
constructed such that high air velocities will not result in a stretching of
the arc.  Thinking more about your question, I realize that this is not
normally the case for air-blast gaps, but I believe it is preferable.  I
think a stretched arc will result in a very unstable breakdown voltage.

BTW, your tesla_oil_rsg.pdf is fascinating!  Good luck trying it!!  Where
did you take that from?

Regards, Gary Lau
Waltham, MA USA 

		-----Original Message-----
		From:	Tesla list [mailto:tesla-at-pupman-dot-com]
		Sent:	Friday, November 17, 2000 7:09 PM
		To:	tesla-at-pupman-dot-com
		Subject:	Re: Air blast SG question

		Original poster: "Luc" <ludev-at-videotron.ca> 

		Hi Garry

		I note same result then Justin Hays ( same thread ) with a
single gap and lot
		of air flow 30 to 80 lb/p^2  flat nuzzle ( maybe it's not a
reasonable airflow
		) the breakdown voltage increases with the pressure. This
explain my question .
		For the moment I can't test it with a coil I can make some
experiment but I
		can't run a coil. I like to know if some of you find any
advantage to run a
		narrow gap with a big air flow .

		If the result is good I want to experiment with may be
liquid flow . I saw a
		study by Tesla he use a rotary inside oil under pressure. I
copy a part of this
		text and make a pdf file you could download it at this
address:
		http://pages.infinit-dot-net/luc2/tesla_oil_rsg.pdf

		Luc Benard

		Tesla list wrote:

		> Original poster: "Lau, Gary" <Gary.Lau-at-compaq-dot-com>
		>
		> Comparing wide gap, small air flow with narrow gap, high
air flow is not a
		> valid comparison.  The gap width determines the gap
breakdown voltage,
		> largely independent of (reasonable) airflow, and Vgap is
something that you
		> want set to one value, regardless of other system
variables.  Thus, only one
		> gap width is correct.
		>
		> I have done experiments with several single static gaps.
Air flow was
		> essential in all of them, but the actual degree was not at
all critical.
		> Anything above a certain modest amount seemed adequate,
and increasing air
		> flow above that level offered no increase in performance.
Performance was
		> dismal below that threshold value.
		>
		> I believe that single static gaps don't quench as well as
multiple static
		> gaps, though this may only be when there are not attached
streamers.  When
		> there are streamers, quenching kind of comes naturally.
And I further
		> believe that single static gaps offer significantly lower
gap losses than do
		> multiple static gaps, and will give better performance.
		>
		> See my web site for details on construction and
measurements:
		> http://people.ne.mediaone-dot-net/lau/tesla/tesla.htm
		> <http://people.ne.mediaone-dot-net/lau/tesla/tesla.htm>
		>
		> Gary Lau
		> Waltham, MA USA
		>
		> >Hi all,
		> >
		> >I like to know if some of you make test on air blast SG.
I want to know
		> >if you had compare wide gap with small air flow vs narrow
gap with high
		> >air flow. What is your conclusions ? about quenching,
general
		> >performance, etc.
		> >
		> >Luc Benard
		>
		>