Re: [TCML] Optimizing coil performance

["David Rieben" <drieben@xxxxxxxxxxx>]

Hi John, 

Agreed, and I've also found that it can be equally as
difficult to get spark lengths >3X the length of the se-
condary coil (assuming a classic 2-coil system). Of 
course, David's secondary is 48" long so he should 
still be good for up 12 ft. sparks from this parameter, 
too, assuming he upsizes his toroid according to both 
yours and my suggestion. :^)

David Rieben


----- Original Message ----- 
From: <futuret@xxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, August 13, 2008 3:15 PM
Subject: Re: [TCML] Optimizing coil performance


David,

It can be difficult to get sparks that are longer than 4X the
toroid diameter.  If you install a 36" or 40" diameter toroid, then
you'll probably get 12 foot sparks without doing anything
else other than retuning as needed for the larger toroid.
You can add the larger toroid above the existing one if
you'd like.

Cheers,
John


-----Original Message-----
From: David Kronstein <david_kronstein@xxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Wed, 13 Aug 2008 2:41 am
Subject: [TCML] Optimizing coil performance


Hi all, 

I'm getting my Tesla coil up and running again, and I'm revisiting the 
design trying to improve performance. Currently the coil struggles to 
get 7-8' arcs with 10kVA input, with the spark gap firing at a 
capacitor voltage of around 20-24kV. The current specs of the coil are: 

Power: 10kVa 14.4kV pole pig, arc welder as variable inductor ballast 
Capacitor: 0.136uF 24kV MMC (originally 0.204uF) 
Spark gap: 240bps SRSG 
Prmary: 3/8" copper tube, 3/8" spacing, 13" ID flat pancake, currently 
tapped at 6.7 turns 
Secondary: 20AWG, 8.5" dia, 48" winding length 
Toroid: 8" x 24" 
Fres: ~100kHz 

What would you guys recommend changing or upgrading to get better 
performance? I'm currently thinking of getting a variac to control 
input power, because the variable inductor affects optimum RSG phasing. 

Regards, 
David K
ronstein 
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