[TCML] Double-layer secondary coil

[Peter Terren]

There will be no effective change in inductance. If it was two widely 
separated coils with no coupling then yes, but a double winding is, to my 
mind so strongly coupled that it is effectively just a wider conductor with 
the same inductance but half the resistance.

Peter

----- Original Message ----- 
From: <otmaskin5 at aol.com>
To: <tesla at pupman.com>
Sent: Monday, February 04, 2008 4:30 AM
Subject: [TCML] Double-layer secondary coil


>I thought Gary Weaver's post of 3 or 4 weeks ago was interesting.? He 
>reported getting ~10% increased spark length after winding another layer of 
>wire over the first layer of his secondary.?
>
> I'm trying to understand the principle behind the increased performance.? 
> It seems clear that the additional layer reduces the secondary coil's 
> resistance?by about half which would support longer sparks.? But it seems 
> like the double-layered coil would also reduce inductance which would 
> reduce spark length.
>
> I'm not sure what the the additional layer's?impact is on the secondary's 
> inductance.? I believe 2 identical coils wired in parallel would reduce 
> total inductance by 1/2, but does the double layer configuration also have 
> an effect I'm not taking into consideration???If so, is there a formula to 
> calculate secondary inductance in this configuration??
>
> Or does the reduction in resistance somehow out-weigh the reduction in 
> inductance in terms of spark length??
>
> I'd appreciate any thoughts on this.? Thanks, Dennis Hopkinton MA
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