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Re: [TCML] Form materials, losses, carbon tracking, sealing
I'm not so sure if using paper concrete forms is such a bad idea if you take care to make a careful selection and remove the "inked" layer, properly dry and varnish the form. For example, here is a picture of a 12" by 48" coil built by Dr. Spark producing about a 8 foot spark. This coil uses a cement form and has produced arcs in excess or 14 feet with no problem!
http://www.drspark.org/images/wwt2007/1281.JPG
Spark on!
Woo
dr.hankenstein@xxxxxxxxxxxxx
"We put the fire in the wire."
> [Original Message]
> From: <FutureT@xxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Date: 12/14/2007 2:29:09 PM
> Subject: Re: [TCML] Form materials, losses, carbon tracking, sealing
>
>
> In a message dated 12/14/2007 4:21:41 P.M. US Eastern Standard Time,
> btmeehan@xxxxxxxxx writes:
>
> >Thanks a lot for the info guys, that helps a lot - I heard someone mention
> >using concrete forms. If I remember, those were made of very thick
> >cardboard? Since I have heard several people talk about it - I imagine that
> >it is reasonably resistant to lighting on fire when it gets strikes?
>
> >I had been looking at a model rocketry site that sells fiberglass forms, and
> >even does custom work. Would I be better off with cheaper PVC or concrete
> >forms, or would the lower loss tangent of fiberglass be worth something?
> >(granted, most of the loss tangent numbers I have seen are in the MHz or GHz
> >region, so kHz is probably not a problem with most materials)
> >(loss tangents)
>
>
> I would avoid those paper concrete forms. Some of them have strange
> lossy materials in them. Some are OK though. Losses in PVC are
> not an issue for Tesla coils, but they are subject to carbon tracking
> when bad racing sparks or flashovers occur. Probably the most common
> material used for secondary forms is PVC. Heating and sealing the PVC
> is said to be beneficial but I never bothered with those procedures.
> My TT-42, and TT-32 coils both use PVC forms.
>
> _http://hometown.aol.com/futuret/page3.html_
> (http://hometown.aol.com/futuret/page3.html)
>
> John
>
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