RE: Voltage determination

["John H. Couture" <couturejh-at-worldnet.att-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

How about using the following equation that takes in the most important
conditions that affect the output spark? One advantage of using factors is
that you do not need to know the efficiencies. The factors are based on
empirical data.

  Spark length = W*Vp*Ls*B

 W = Input watts

 Vp = Factor for Tesla primary volts

 Ls = Factor for secondary inductance

 B = Factor for breaks per second

The JHCTES program uses a similar equation.

John Couture

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

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Sunday, July 23, 2000 6:20 PM
To: tesla-at-pupman-dot-com
Subject: Re: Voltage determination


Original poster: "Malcolm Watts" <M.J.Watts-at-massey.ac.nz>

On 22 Jul 00, at 11:26, Tesla list wrote:

> Original poster: "Barton B. Anderson" <tesla123-at-pacbell-dot-net>
>
> Hi Jim, All,
>
> Agree about the needle and ROC situation, but I'm not sure about the
30kV/cm. I
> have no idea what it is but I'm starting to wonder if this value varies.
I've
> seen this value used (and several others). In the archives, I read a 1998
post
> from Bill Wysock stating that 13M "may" be around 8kv/inch (or near) and
that
> the output voltage was about 1/3 less than originally thought. This was
based
> on an IEEE paper he was reading at the time which appeared to leave an
> impression on him.
>
> I'm not sure if Bill remembers that one, but it did start me pondering
that
> possibly a volts/unit value may change with coil power, dimensions,
> environments, etc. If it does change, then is it too much to use a
standard?
> Maybe it doesn't - I don't know.
>
> I'm curious if anyone else has insight on the subject. Is there a
consensus?
>
> Thanks,
> Bart
<snip>

hi Bart,
         I think there is a sparklength dependency on voltage
but equally there is one dependent on available charge and in
the case of a TC, there is a repetition factor as well.
Consider a lightning bolt which travels far further than the
voltage estimates of a few tens of MVs that I have seen would
suggest.
      For a TC, run it up from 1BPS to ? and watch the sparks
grow. It may be impossible to point to one element alone (e.g.
voltage) and say that it is resonsible for a certain length of
spark since it won't get very far if there is no substantial
source of charge to back it up.

Regards,
Malcolm