Re: whats my coupling? (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Fri, 17 Aug 2007 19:20:55 -0700
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: whats my coupling? (fwd)

Hi Scott,

I took a look at your coil again with a little more detail. First, the 
0.16 coupling was an assumption of position, but it could also be much 
lower simply depending on your actual current position. Anyway, the coil 
should look something like this:
http://www.classictesla.com/temp/sb.gif

The above pic shows a position where the inside turn is 1.5" below the 
bottom secondary turn for a coupling of 0.122 which is a decent spot. 
The coil itself looks like it's in tune, but then I guessed at outer 
turn and top to bottom turn primary dimensions. I assume your getting 5 
to 6 foot sparks? The cap value is at about 1.1 x Cres from what I 
gather, so your probably taking advantage of some resonant charging.

All in all, it looks like a fine coil! The above position is a basic 
"should do well" value, but it does not identify if it's "ideal". I 
think the only way to find out the "ideal" coupling is to experiment 
with various positions, but only change them about 1/4" at a time and 
try maintain the same voltage level during those experiments.

Take care,
Bart



Tesla list wrote:

>---------- Forwarded message ----------
>Date: Thu, 16 Aug 2007 22:10:30 -0700
>From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
>To: Tesla list <tesla@xxxxxxxxxx>
>Subject: Re: whats my coupling? (fwd)
>
>Hi Scott,
>
>Your coupling is slightly high, but doable. It's currently about 0.16. I 
>can analyze this better tomorrow as this email caught me at that point 
>where it's bed time for the old Bartdude (eye's are dreary. I'm too old 
>to be young and too young to be old).
>
>Take care,
>Bart
>
>Tesla list wrote:
>
>  
>
>>---------- Forwarded message ----------
>>Date: Thu, 16 Aug 2007 20:56:07 -0400
>>From: Scott Bogard <teslas-intern@xxxxxxxxxxx>
>>To: tesla@xxxxxxxxxx
>>Subject: whats my coupling?
>>
>>Hey guys.
>>    For those of you who are fluent with the various design programs, I 
>>need to know where my optimum coupling is.  I have a 6-in PVC secondary, 31 
>>inches wound, 22 AWG.  My top load (is this important?) is 2 toroids, the 
>>bottom is 7*24, the top is 12*36, one sits atop the other, and the bottom 
>>one is about 2.5-3 inches from the top winding.  My primary, is 1/4 in cu 
>>tubing, inverse cone (about 20 degrees) with an 8 in hole in the center, 
>>.75-in between turns (tapped at turn, um, I cannot remember, but I think it 
>>is 7-8-ish).  My power supply is 4 MOTs, 8kV and estimated 225mA, tank 
>>capacitance is 81nf (again, I'm not sure if you need this information).  My 
>>secondary is stationary, but I can raise and lower my primary from .25-in 
>>below the bottom winding, to about a foot, I am working on a way to adjust 
>>my top load height.  Thanks.
>>Scott Bogard.
>>P.S. I use 120 or 240 sync, if this is important.
>>
>>_________________________________________________________________
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