# [TCML] Voltage on the Streamers

```Helloooooo, please excuse my error writing “Gary” instead of “Greg!”

I’ve corrected my mistake below.

So sorry that my brain malfunctioned!!!

Thanks,

Bill

Sent by Mačak's humble servant.

Begin forwarded message:

> From: William Fox <wm9fox@xxxxxxxxx>
> Date: September 7, 2020 at 12:06:33 PM EDT
> To: tesla@xxxxxxxxxxxxxxxxxx
> Subject: Re:    Voltage on the Streamers
>
> David Varas & I had a great conversation on another social media platform & here’s my initial response:
>
> The Tesla coil spark is a completely different animal from static electricity, direct current, or mains frequency sparks!!!
>
> This is because there is an “arc channel” formed from the initial spark, ionizing the air, allowing the next spark to grow in length.  This process eventually is in a steady state, so to speak & the spark cannot grow longer.
>
> Greg Leyh (of Lightning on Demand) is probably the leading expert in high power Tesla coil research & he explained this to me at a Teslathon in New York when I first had the pleasure to meet & chat with him...
>
> His rough estimate or “rule of thumb”
> relationship between output voltage and streamer length is 200kV/m.
>
> The below I hadn’t discussed...
> ..........
> Greg discussed with me two approaches regarding approximate output voltage itself:
>
> 1).  Calculation:  From conservative of energy we know 1/2 (Cp)Vp^2 = 1/2(Cs)Vs^2.
>
> Allowing for 25% losses this becomes CsVs^2 = 0,75*CpVp^2 and...
>
> Vs = SQRT (0,75*Cp/Cs) or...
>
> Vs ≈ 0,866*SQRT (Cp/Cs)
>
> 2).  By measurement:
>
> Install a wide-band current transformer in the secondary’s ground to earth connection.
>
> Observe with proper recording instrumentation, the corresponding current.
>
> The secondary reactance is calculated by Xs = 2*pi*fs  (this neglects secondary DC resistance).
>
> The output voltage, Vs is what we “see” across the above reactance, or
>
> Vs ≈ 2*pi*fs*Is
> ..........
> Therefore, whatever his experience is, I’ll agree with him.
>
> https://www.lod.org/research/research.html
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