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RE: [TCML] finishing a secondary - would insulating foam be a goodidea?
Thanks to everyone for their comments. Did not use foam in the end, as per
recommendations - just two PPE disks in the tube and PPE disks at the ends.
The secondary fits on the primary using a wood dowel; in the picture below
the square wooded base has been glued under the base of the primary, and the
disks arrangement slides in the secondary. Thus I can adjust height easily
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Sent: 05 October 2008 03:34
To: Tesla Coil Mailing List
Subject: Re: [TCML] finishing a secondary - would insulating foam be a
Considering that air is a rather decient "insulator", I would have
reason to believe that introducing a poly type of material inside the
secondary is asking for trouble. Considering that most poly foams are a
hydrogen/carbon molecular combination, any small arc would rapidly
become a major burn trial and thus a carbon track for additional arcing
to propigate thru....
stick to a couple of baffles ( 1 at each end) its already a proven
method of internal arc reduction....
but.. if you want to try the foam method, Im sure we all would like to
know just how fast arcing does occur ;)
Thomas Ryckmans wrote:
>I am finishing my 4 inches/10 cm diameter secondary, fitting a few PPE
>inside to prevent arcing and a couple at the ends to help fitting with
>primary base and the topload respectively
>Would it be a good idea to fill the secondary tube with insulating foam to
>further prevent internal arcing? The foam is the one that come in canisters
>and expands and harden once sprayed. Polymer is either polyurethane or
>Many thanks for your comments,
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