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Re: outdoor coils

Original poster: "MIKE HARDY" <MHARDY@xxxxxxxxxx>

Lets hear more about coils in cold conditions. I live in Wisconsin. It's
going to get down in the teens tonight. This'll be the first winter my coils
see. Will my coils survive? One is PVC coated with glyptal, then wound and
polyurethaned. Other is acrylic wound and coated the same. Third isn't
wound, but fiberglass coated in glyptal.

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, November 17, 2005 12:16 AM
Subject: Re: outdoor coils


> Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
>
> Hi Chris, Robert,
>
> Interesting! I'm in CA these days but started coiling in Minnesota
> which is cold cold cold. I didn't use PVC but sonotube at that point
> which I did coat inside and out with a thinned-out urethane (to
> absorb into the sonotube). Due to the temp swings, I decided to use
> Marine Spar Varnish for the outer coating. This particular varnish
> remains flexible (hard to the touch). I've never had any problems
> with cracking, shrinking, expanding, etc.. Just wanted to mention
> that as it's available at all hardware stores. Even though I'm in
> sunny CA, I still use the same varnish. It's been a nice varnish and
> goes on thick.
>
> Take care,
> Bart
>
> Tesla list wrote:
>
> >Original poster: robert heidlebaugh <rheidlebaugh@xxxxxxxxxxxxxx>
> >
> >Chris: I am at 7200 ft alt.so temprature extreams are a serious
problem.PVC
> >has a large expansion ratio so it is very important that your coating be
> >well bonded to your coil form or the secondary coil will slide off the
coil
> >form in cold weather. I beleave I have finaly solved this problem by
rough
> >sanding my coil form and pre coating the form before winding my coil
while
> >the coating is still slightly soft so the wire will not slide off. I have
> >had my coil drop 2 inches down the coil form in the cold.
> >    Robert   H
>
>