# Re: Re: Racing Spark Prediction

```Original poster: <a1accounting@xxxxxxxxxxxxx>

Hi all,

At the risk of speculating ad nauseam (no offence taken or intended)
```
I believe it was suggested that some R in series with the secondary ground or top load would help attenuate higher frequencies. Better attenuation relative to the fundamental can probably be achieved with L in parallel with R. The idea being to bypass the R at low frequencies. The practical problem is probably constructing the L. Perhaps by passing part of the coil with R. It may be more practical for overtones of the primary and HF components of transients from arcs.
```
```
To investigate the third overtone why not tune the secondary to it and vary the bang energy. Perhaps use a secondary with a strip of bare winding so punctures of the insulation do not favour a particular start point and possibly to minimize the voltage to initiate racing parks. The strip could be created by lightly sanding a strip of the secondary.
```
>
> From: "Tesla list" <tesla@xxxxxxxxxx>
> Date: 2006/05/20 Sat PM 02:12:07 EDT
> To: tesla@xxxxxxxxxx
> Subject: Re: Racing Spark Prediction
>
> Original poster: Paul Nicholson <paul@xxxxxxxxxxxxxxxxxxx>
>
> Hi All,
>
> I wrote:
>  > My hunch is that overtones have something to do with it
>
> Dmitry wrote:
>  > then how about "folded resonator" concept?
>
> Bob wrote:
>  > Can you explain why a folded resonator may cure racing sparks?
>
> Dmitry wrote:
>  > why are you asking me about ways to stop racing sparks?
>
> Hey you guys, go easy!  These sound like fair questions if we
> suspect HF signals are causing racing arcs. Folding - meaning it
> appears,  we wind some of the secondary in reverse direction to
> the rest - is worth putting on the table.  If a resonant mode
> is identified as responsible, we must relocate it or dampen it.
> Changing the reactance distribution by folding might be one
> possibility, but until we know more about which HF modes are
> responsible, if any, I don't see how we can pursue that idea.
> Let's identify the cause before considering the cure.

```
>
```
```