Re: [TCML] 40cm breakout!

[Simon Dodd <simon@xxxxxxxxxxxxxxxx>]

Thanks for the clarification David,
now to get out my pad of coil design notes again!!

Thanks

Simon
On 14 Jan 2011, at 21:38, David Rieben wrote:

> Hi Simon,
> 
> Congratulations on your first light! As a side note,
> I hate to be the one to "burst your balloon", but I
> must tell you that your 42 cm spark length does
> NOT represent a1 million volts potential. Not sure
> that even straight DC with very large radius of curva-
> tured electrodes could hold off that much voltage with
> that short of an electrode gap. The high frequency
> nature of Tesla coil discharges allows for each
> spark to reach out beyond the ionized trail of the
> spark of the previous cycle, which means that the
> discharges of a Tesla coil can reach lengths that are
> much greater than what their actual voltage potential
> would suggest. The old spark length vs. voltage scales
> for DC sphere/sphere discharge are pretty much useless
> for determining the voltage output of a TC. The actual
> secondary output voltage of a Tesla coil is extremely
> "challenging" to measure by conventional means
> but it can be determined with reasonable accuracy by
> the formula: Vs = Vp x sqrt (Ls/Lp) - minus circuit losses,
> Where Lp is the primary inductance, in Henries, Ls is the
> secondary inductance, Vp is the peak primary voltage
> that is discharged from the capacitor into the primary coil,
> and Vs in the output voltage from the secondary coil.
> In practice, the actual voltage values of the output of
> Tesla coils in the size category of yours typically falls into
> the 150 to 200 kV range and very few Tesla coils (even
> huge ones!) are able to reach a true megavolt potential.
> 
> David Rieben
> 
> 
> 
> ----- Original Message ----- From: "Simon Dodd" <simon@xxxxxxxxxxxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Friday, January 14, 2011 10:44 AM
> Subject: [TCML] 40cm breakout!
> 
> 
> Hi Guys,
> 
> I haven't been active in here for a while now but my tesla coil is now working beautifully!
> 
> You can see the video at
> youtube.com/simondoddy
> 
> I can't remember if we are allowed to post live links in here so I have left it like that.
> 
> Hope you enjoy it. It has taken me long enough to get it to this level! Now to build a solid state one!!
> 
> Thanks for all your help over the years in getting me to this stage, feel free to skip all the talking at the beginning of the video!
> 
> Simon_______________________________________________
> Tesla mailing list
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> 
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