Re: [TCML] Strike rail hits and loud bangs - video uploaded

[bartb <bartb@xxxxxxxxxxxxxxxx>]

Part of the Terry Filter is the safety gap. This part of the filter is 
simply a safety gap (and nothing more, so the same physics apply). And 
as with any safety gap, you must evaluate it for that specific purpose. 
Electrode radius, curvature, smoothness, gap distances, size, etc... are 
all part of when this safety gap will become active with the voltages it 
comes across.

Do you have a photo of it? In some cases, coilers can see the problem 
right away, and in other cases, it's normally matter of gap distance. In 
either case, the main "gap" tells most of the story of why a safety gap 
is firing too often. But both must be evaluated for a "meaningful" 
diagnosis.

Take care,
Bart

DC Cox wrote:
> The loud bangs across the Terry filter are caused by the main cap's energy
> firing across a very low inductance load instead of going thru the primary
> where the
> energy is coupled into the sec coil.  This, from a mechanical standpoint, is
> like putting your auto in neutral and then depressing the gas pedel to the
> floor.  Lots of
> energy going nowhere and is extremely hard on the caps.
>
> You may consider tuning for more inductance to aleviate the problem.
>
> Dr. Resonance
>
>
>
>
> On Tue, Sep 30, 2008 at 9:15 PM, Stephen J. Hobley <shobley@xxxxxxxxxx>wrote:
>
>   
> > http://www.youtube.com/watch?v=GO9_vc49ZcU
> >
> > You can see/hear the "bang" at the end of the run.
> >
> > Is this a primary coil strike?
> > How can we fix this?
> >
> > Steve
> >
> > ________________________________
> >
> > From: Stephen J. Hobley
> > Sent: Tue 9/30/2008 9:37 PM
> > To: Tesla Coil Mailing List
> > Subject: Strike rail hits and loud bangs
> >
> >
> > We have a fairly simple coil using a 60ma NST. Recently I changed the tap
> > point on the primary and by chance hit a really sweet spot.
> >
> > Usually the Tesla Tuner is pretty accurate and gives good results, but in
> > this case it did not indicate that this tap point was a good one.
> >
> > The streamer length has increased by at least 50% - but we did notice some
> > rather worrying "bangs" from the Terry filter spark gap when the strike rail
> > is being hit. Is this normal?
> >
> > Is it possible to tune a Tesla coil into a self-destructive state?
> >
> > I would take some pictures, but the darned thing scares me to death...
> > :-)
> >
> > Steve
> >
> >
> >
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> >
> >     
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx
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>
>   
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