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Voltage/Length (fwd)


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From:  D.C. Cox [SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent:  Wednesday, January 28, 1998 12:07 PM
To:  Tesla List
Subject:  Re: Voltage/Length (fwd)

to: John & Malcolm

Correction on the spark length.  5 ft equals 500 kV (not 1000 kV) and 9 ft
equals 1000 kV.

DR.RESONANCE-at-next-wave-dot-net


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> From: Tesla List <tesla-at-pupman-dot-com>
> To: 'Tesla List' <tesla-at-pupman-dot-com>
> Subject: Voltage/Length (fwd)
> Date: Wednesday, January 28, 1998 6:56 AM
> 
> 
> ----------
> From:  John H. Couture [SMTP:couturejh-at-worldnet.att-dot-net]
> Sent:  Wednesday, January 28, 1998 12:37 AM
> To:  Tesla List
> Subject:  Re: Voltage/Length (fwd)
> 
> At 11:10 PM 1/27/98 +0000, you wrote:
> >
> >----------
> >From:  Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
> >Sent:  Tuesday, January 27, 1998 3:35 PM
> >To:  tesla-at-pupman-dot-com
> >Subject:  Re: Voltage/Length (fwd)
> 
> >The closest I have come is to measure single shot attached spark 
> >lengths (impulse only) as D.C. Cox has done. I have compared those 
> >with measurements from other impulse sources (Marx Banks) whose 
> >theoretical outputs can be made to match real outputs very closely 
> >in practice. The 3'/MV figure is a guide I use although I recognize 
> >-----------------
>  The 3 ft/MV at least is a number to work with. In an earlier post Cox
said
> he thought a 5 ft spark represented one million volts. My engineering
text
> says that about a 4 ft spark is one MV. But this is a one shot peak
voltage.
> I would expect that multiple sparks as with  Tesla coil operation would
give
> a spark closer to 5 ft.
>        Vs = 65 x 49.8^.7 = 1000 KV
>  This equation has been used by many coilers and found to be as close as
can
> be expected to reality.
>   JC
> ----------------------
> >*proven* to be real. This brings us into the realm of model validity 
> >which is outside the scope of this post.
> >--------------------
>   Model validity is very important and must be capable of being verified
by
> calculations done correctly. This is especially important when energy,
> power, and secondary volts are involved. This is because the Tesla coil
> system does unfamiliar engineering magic with these variables. The JHCTES
TC
> computer program attempts to unravel the intricacies of TC design. As
there
> are no similar TC programs at present it is not possible to make
comparisons
> and changes so as to improve it.
>   JC
> ----------------------
> >What calculations? Calculations are trivial if one has a formula but 
> >having a formula is dependent on formulating for a particular piece 
> >of hardware.
> ------------------------
>   Calculations are not trivial when done correctly. Calcs give the facts
> rather than subjective opinions. For example the confusion that coilers
have
> over power and energy could be lessened if calculations of examples were
shown.
>   JC
> ---------------------------
> >that have no basis in reality. It would appear from what people have 
> >said that Tuve et al's work is flawed and therefore useless. One can 
> -----------------------
>   How can anyone say that Tuve et al's work is flawed when they do not
> understand the fundamentals involved? I would not say that the tests and
> calcs of these three scientists were flawed unless I could repeat their
> tests and calculations and show where they erred.
>   JC
> ---------------------------
> >purpose. Personally, I would accept a quanitifiable error of 1% in 
> >measuring TC output voltage as being close enough to be useful in 
> >choosing between models. Jim's technique is a good one in my opinion. 
> >It gets asymptotically closer to the real answer. It will never get 
> >Regards,
> >Malcolm
> -----------------------------------
>   Jim Monte's or anyone's secondary voltage tests and extrapolation have
the
> advantage that the tests can be easily verified up to 2 million volts.
This
> is the range of engineering lab high voltage tests that have been
published
> by several labs in this and other countries. The spark lengths, air
> conditions, etc. have been carefully documented. They are all one shot
and
> not multiple sparks like with Tesla coils. Coilers have found that
multiple
> sparks are longer than one shots because of the ionization of the spark
air
> path. The Vs equation above gives spark lengths that are slightly longer
> than the HV lab sparks for this reason.
> 
>   There is a lot to learn about TC operation.
>   Comments are welcomed.
> 
>   John Couture
>