Re: [TCML] Proper VTTC Coupling?

[futuret@xxxxxxx]

John,

The secondary winding would be 2.5" dia x 9" tall and run at about 1mHz.
The spark length would be maybe 11" or so.

John


-----Original Message-----
From: Dr. John W. Gudenas <comsciprof@xxxxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Sat, 18 Oct 2008 6:15 pm
Subject: Re: [TCML] Proper VTTC Coupling?


John 
Give me some idea of "small". I have, in the past, tightly coupled 811A 
coils with excellent performance. 
John W. G. 
 
John W. Gudenas, Ph.D. 
Professor of Computer Science 
On Oct 18, 2008, at 4:32 PM, futuret@xxxxxxx wrote: 
 
> Does anyone have any suggestions for the best coupling value 
> for a small VTTC? I usually use something around 0.2 or 0.18 
> but those figures may have actually been lower. I did some 
> experiments at k = 0.3 or so, but a flashover destroyed the 
> primary and secondary. Has anyone loosened the coupling to 
> 0.10 or so and seen any reduction in spark length? 
>  
> Has anyone noticed if the spark characteristics change with 
> various couplings? I saw some evidence that too tight coupling 
> ruins the sword-like spark effect. Not sure though. I'm 
> aware of Steve Ward's work in which he found that a too-low 
> frequency killed the sword-sparks. In my own work, I found 
> the sword sparks to be affected by various parameters and 
> adjustments. I never at
tempted to verify the frequency idea. 
>  
> Thanks, 
> John 
>  
>  
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