Re: Vtop vs coil length

• To: tesla-at-pupman-dot-com
• Subject: Re: Vtop vs coil length
• From: Finn Hammer <f-hammer-at-post5.tele.dk> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Thu, 10 Jun 1999 07:28:28 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Doc.R, stephan, all:
This sure has impressed on me, that I should not push this coil much
further, since I am close to a spark =3   'coillength.

Tesla List skrev:
> 
> Original Poster: "STK" <STK.TC-at-gmx-dot-net>
> 
> Hi Finn, Doc R., all,
> 
snip  

> My question is, how did you calculate the voltage? 


I was using:
Vout = SQRT(2*Ep/Ctot)  From one of Malcoms old postings.
where Ep=0.5*Cp*Vc^2   
> 
bigsnip 

> Do you agree with my math here or did you calculate the voltage
> in an other way?

Stephan, It is not up to me to agree with your math, I simply study it,
give up, and save it in my TC-Math txt file, and hope to, if not
understand it, then at least use it, some day..... :-)
> 
> For your present coil, I have found the following parameters
> on your website:
> 

Comments in brackets:


> tank circuit:
>  Up = 20kV
>  Cp = 33nF    (34,2 nF)
> 
> secondary:
>  250mm
>  N=807
>  0,95mm wire (plus 0,08 mm lacquer =1.03mm)
>  winding length therefore about 79cm (my guess) ( 83,12 cm)
>  this works out to Cself=18.9pF (???)  (More like 16 pF)
>  (L=45.7mH, f0=171kHz, f=101kHz)
> 
> toroid:
>  seems to be 250mm ducting   (32 cm)
>  If this is true, the mean diameter seems to be 72cm  (64)
>  together with the anti corona ring you have approx.
>  Ctop=35pF (???)    (39 pF)
> 
> Im missing a 'specs-page' on your Website! ;-) (I`l look into that :-)
> 
> Throwing all the data into formula (3), we get
> Utop= 20kV * sqr(33nF/(18.9/4+35)pF)
>     = 20kV * sqr(33000/39.7)
>     = 576kV     (close enough)
snip


> Cheers, Stefan
>      \_            _    _/\_________________________________
>        \_______  _/ `--'                                    |
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> _   __/   |_|    \_      visit "Stefans Tesla coil pages"   |
>  \_/  `   |_|     `    with lots of photographs, formulas   |
>  _/    .__|_|__.     and technical infos around TCs at      |
> /_______\-|-|-/___ http://privat.schlund.de/skluge/toc.htm _|
> 
> Dieses Dokument wurde elektronisch erstellt und ist auch ohne
> Umlaute gueltig.
> 
> Famous last words:  Oh, a Tesla coil - I heard you can touch
>                     it without getting hurt --> Zzzzzapp ...

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