# Re: [TCML] Subject: Overheated Secondary

```Hi David,

Yes it would.

```
If I used a .075uF cap size at 120 bps in say an SRSG setup: = 6.48j x 120bps = 778W. If I used a .019uF cap size at 120 bps is say an SRSG setup: = 2.13j x 120bps = 256W.
```
For spark length, I use the following:
```
Spark Length (inches) = sqrt(VA) + (sqrt(eJ x BPS x 1.263) x .75), (.75 is as a loss factor).
```
In the case of the .075uF, sqrt(2120)+(sqrt(6.48*120*1.263)*.75)= 69.6"
In the case of the .019uF, sqrt(2120)+(sqrt(2.13*120*1.263)*.75)= 59.5"

```
My coil runs about 60" spark length on average, so it's exactly as I would expect it to.
```For a cross check, the JF equation would show 66" in both cases.

```
The reason I use the above equation is that it accounts for bang energy. Someday I may insert a cap into LTR mode on this coil, but not today.
```
```
Btw, Javatc had a similar sqrt(2) issue in the rsg and static gap spark length fields (noticed while checking my math). This caused the output spark length value to be high by a factor of 1.4. I corrected that and pushed Javatc to version 11.5 on the web and pc download zip file. I also found my script editor kept changing the Omega symbol when it read in the file, so I simply put that back to text "Ohms" as it use to be.
```
Take care,
Bart

David Rieben wrote:
```
```Hi Bart,

Am I reading that right? You're running an NST coil at 2.7X
LOWER or smaller than resonance? Wouldn't that really limit

David Rieben

```
```Hi Wyatt,

```
```I'm running my NST coil about 2.7 times lower
```
than Cres with no problems (safety gaps, gap widths, etc. are of course important).
```
Take care,
Bart
```
```

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