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Re: [TCML] secondary tube wall thickness



The electric field in a TC secondary form are only longitudinal, so if you assume a 1 meter long secondary, the end-to-end cap would be in the few pF range. That assumes that the field stays confined in the plastic, but it would leak out into the air, reducing the capacitance further.

Should work fine.  Mine does.

---Carl





-----Original Message----- From: Tim Flood
Sent: Friday, April 11, 2014 5:25 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] secondary tube wall thickness

I built a nice performing coil with a 3" diameter grey pvc secondary that
had a 3/4" wall thickness.

Tim Flood


On Thu, Apr 10, 2014 at 7:11 PM, <mddeming@xxxxxxx> wrote:

PVC is fine for a secondary if it is solid and not "foam-core". Foam-core
is very light for its size and viewing it from the end looks like Styrofoam
sandwiched between two thin layers of hard plastic. This type has water
retention problems. Some pipe colorants contain carbon particles which make
them inconveniently conductive. I believe the pipe you describe, if solid,
should work fine. Just remember to remove all lettering and markings from
the outside of the pipe as the black lettering is usually loaded with
carbon. Acetone works fine for this, just to it outdoors as the fumes can
give you a powerful but unpleasant "buzz".

Matt D

-----Original Message-----
From: David Boyle <twoten@xxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Thu, Apr 10, 2014 4:59 pm
Subject: [TCML] secondary tube wall thickness


I have a nice long piece of turquoise pvc pipe. It's almost 7" in
diameter, but the wall thickness is pretty thick at 10mm or a bit over
3/8ths. Will the rf losses make this a dud for winding on a secondary?
And is pvc an undesirable material to begin with? Thanks in advance for
your help!
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