RE: Voltage determination

["Richard Kircher" <richard.kircher-at-worldnet.att-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

John, 
	I've got to agree with Malcolm.  Without a significant charge or stored
energy, there won't be much of a spark length.  The spark length equation
you are using is not correct out of the context you have in mind.  I
noticed this when I tried your program and found that the output spark
length did not vary when I either increased or reduced the primary
capacitor size down to 1 pF.  What size capacitor did you use to determine
this empirical data?  It surely could not have been 1 pF or 100uF.
Equations should work without assumptions IMO.
Dick


At 07:36 PM 7/24/00 -0600, you wrote:
>Original poster: "John H. Couture" <couturejh-at-worldnet.att-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
>