RE: spark length formula needed*

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "John H. Couture by way of Terry Fritz <twftesla-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>


Marc -

Thank you for your interest in the JHCTES program. Although this program has
taken several years to develop based on real world coils the program still
requires improvement. One example is the spark length parameter. The program
shows that the spark length increases as the power source voltage (NST
secondary) increases. This voltage is also dependent on the voltage
regulation of the source, and thereby hangs a tale.

The voltage regulation differs for NST, pole transformers, bombarders, etc.
Because of this variation the spark length for a NST at a certain apparent
wattage will be less than for a pole transformer, etc, of the same wattage.
The JHCTES program does not take voltage regulation into consideration and I
have never heard of any spark length equation that does. Some day when
enough test info becomes available, this voltage regulation parameter can be
added to equations and computer programs.

Voltage regulation for a certain power source can change with the type of
load applied. This may be the reason that some coilers have found a jump in
streamer behavior when the power changes because Tesla coil operation is a
varying load type of operation.

John Couture

--------------------------


-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Thursday, December 20, 2001 4:49 PM
To: tesla-at-pupman-dot-com
Subject: Re: spark length formula needed*


Original poster: "Metlicka Marc by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<mystuffs-at-orwell-dot-net>

I am a firm believer in John C's calculator! As some know, I've built
some very "unorthodox" tc configs and running even the strangest, being
the 3k coil, John C's calculator has always given me a good and reliable
spark length to expect!
My hat's off to Mr. Courture, I've slapped some very "unique" coils
through his program and by gum, it's been within a few inches with good
tuning.
Good work John!
Take care,
Marc M.

Tesla list wrote:
>
> Original poster: "John H. Couture by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>
>
> J. Whyte -
>
> The TC spark length from the secondary terminal is dependent on many
> variables. The most important are input watts, Tesla primary voltage, and
> secondary coil inductance. The JHCTES Ver 3.3 TC computer program uses
these
> three variables to determine the output spark length shown by the
computer.
> You may want to compare the Ver 3.3 spark length with formulas that you
> find. However, keep in mind that TC spark length is a somewhat random
output
> for comparing Tesla coils.
>
> The Ver 3.3 program is an on-line program and is at the following web site
>
>      www.mgte-dot-com
>
> Click on Tesla and then JHCTES
>
> John Couture
>
> --------------------------------
>
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Wednesday, December 19, 2001 4:07 PM
> To: tesla-at-pupman-dot-com
> Subject: spark length formula needed*
>
> Original poster: "J Whyte by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <xoom321-at-hotmail-dot-com>
>
> Is their a way of determining spark length via mathmatical formula.
>
> I am suspicious of the TC calculator: I keep getting 226" (18.83 ft) for
> spark length for a quadruple MOT power supply with a 115 nF as my tank
cap.
>
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