I found Jeff Pennoyer's site:
http://www.webring.org/l/rd?ring=teslaring;id=107;url=http%3A%2F%2Fhome%2Ecomcast%2Enet%2F%7Epennoyer%2FJeffPage%2Ehtml
At the bottom there is this list which falls in line with what I was
looking for on spark length:
APPROXIMATE SPARK LENGTH VRS POWER INPUT CHART
SPARK LENGTH POWER INPUT
6 - 8 INCHES 300 W
8 - 12 INCHES 500 W
12 - 18 INCHES 700 W
15 - 20 INCHES 1000 W
18 - 24 INCHES 1200 W
24 - 30 INCHES 1500 W
30 - 36 INCHES 2000 W
36 - 45 INCHES 2500 W
45 - 56 INCHES 3000 W
56 - 64 INCHES 3500 W
64 - 72 INCHES 4000 W
72 - 80 INCHES 4500 W
80 - 90 INCHES 5000 W
So using (2) 15kv 60mA NST provides about 1850 W. I am getting at least 36
inches and many times 48 inches or more of sparks from my 6"x25" toroid:
STANDARD SIZE TOROID REFERENCE CHART
TORUS SIZE TORUS CAPAC. SUG. SEC. DIA. SUG. POWER LEVEL
1 X 6 in. 5.10 PF 2 - 4 in. 200 - 400 W
2 X 8 in. 6.80 PF 3 - 5 in. 400 - 800 W
3 X 12 in. 12.95 PF 4 - 6 in. 700 - 1500 W
5 X 14 in. 16.08 PF 6 - 8 in. 1200 - 2500 W
5 X 20 in. 21.58 PF 8 - 12 in. 1800 - 4000 W
7 X 30 in. 32.17 PF 10 - 15 in. 3500 - 6000 W
6 X 36 in. 37.18 PF 12 - 18 in. 5000 - 7500 W
12 X 36 in. 40.84 PF 16 - 20 in. 6500 - 10000 W
8 X 48 in. 49.60 PF 18 - 22 in. 8000 - 12000 W
12 X 48 in. 51.80 PF 21 - 25 in. 10000 - 15000 W
12 X 60 in. 63.33 PF 23 - 28 in. 13000 - 18000 W
20 X 60 in. 68.10 PF 26 - 30 in. 15000 - 20000 W
Looks like my coil is exceeding these specs on spark length.
I'm wondering if building a bigger toroid perhaps 8"x32" (or so) will be an
overkill for only 1850W on my 2 NSTs?
Tim
On Mon, Apr 6, 2015 at 8:34 AM, Timothy Gilmore <tdg8934@xxxxxxxxx> wrote:
> Has anyone put together any sort of a listing of others Tesla Coils built
> with parameters listed such as:
>
> (for example): I have 2 NSTs (15kv, 60ma) each, 6" diameter, 31" high
> secondary, torroid is ....
>
> I am getting 3-4' sparks and wondering if I should be getting longer
> sparks. Is this normal? or should I add another NST or bigger Toroid
> (working on an 8" diameter ducting bigger one). How do I know since the
> Tesla Map software says I should get "ideally" 72.6 inch sparks and I'm
> getting about 1/2 to 2/3 of that. Just wondering if it's not tuned properly
> (but I think it is) - or making a larger toroid is worth the effort if I'll
> gain a foot or more sparks.
>
> How does one know they are getting close to the best they can get in spark
> length?
>
> I have attached my Tesla Map file of current settings.
>
> Thanks,
>
> Tim
>
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