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Re: drying coil forms
I don't know whether drying PVC coil forms produces a significant electrical
improvement, I suppose that theoretically it might. However it does improve
the adhesion of polyurethane varnish. I have dried forms using warm air from
a small fan heater in a large box (low duty cycle over several days), and
using a chemical dessicant (magnesium sulphate). There are certainly some
dessicants to avoid, eg calcium chloride. The method I used with magnesium
sulphate ( Epsom Salts, incidentally discovered only a few miles from here
by Nehemiah Grew at Epsom), was to fill a number of cloth bags with the
salt, and then dry it in a low oven at about 200C for a few hours. I then
placed the form and the dessicant in a large plastic sack and left it for a
week.
----- Original Message -----
From: Tesla List <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, December 04, 1999 9:22 PM
Subject: Re: drying coil forms
> Original Poster: FutureT-at-aol-dot-com
>
> In a message dated 99-12-04 10:29:31 EST, you write:
>
> << I would love to see some data that demonstrates the performance
benefits of
> > "dry" PVC over "wet" PVC, or even some performance data of the same
> > secondary coil wound on various formers.
>
> > Making arcs in Huntington Beach, CA
> > Ross Overstreet
> >>
>
> Ross, all,
>
> My guess is it would be hard to see a difference. But yes, I'd also like
> to see some true performance data. I do know that I got the same
> spark length from a 6.5" by 24" polyethylene secondary wound with
> # 28 wire, and from a 4.2" by 23" PVC (untreated) secondary wound
> with the same wire. Sparks were 42" in both cases, using a 12kV,
> 30ma NST. If there was any difference in spark length, it was too
> small for me to measure
>
> Cheers,
> John Freau
>
>
>