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Re: wondering (fwd)
Original poster: List moderator <mod1@xxxxxxxxxx>
---------- Forwarded message ----------
Date: Sun, 3 Jun 2007 16:09:04 EDT
From: Mddeming@xxxxxxx
To: tesla@xxxxxxxxxx
Subject: Re: wondering (fwd)
In a message dated 6/3/07 1:01:11 P.M. Eastern Daylight Time,
tesla@xxxxxxxxxx writes:
> ---------- Forwarded message ----------
> Date: Sun, 3 Jun 2007 09:30:52 -0700 (PDT)
> From: Mike <megavolts61@xxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: wondering
>
> Hi all,
> I know the best material to use as a coil form would be either HDPE
or styrene, but if pvc is the best available choice, would milling grooves
lengthwise down the form make it less lossy? I'm sure it would be a pain in
the butt to do, but wonder if it would be worth the trouble.
> Also, I cannot seem to find info on whether a sonotube would be a
better choice to reduce losses in the form.
> Mike
Hi Mike,
Sonotube takes more preparation to make it useful but IF properly done, IMO
performance differences are negligible. The attraction of sonotube is that
with PVC, cost increases as the square of the diameter for the same length. I
did a comparison a few years ago and IIRC, the average over several suppliers
for larger Sch 40 PVC was something like cost= 0.2 D^2 + 0.4 D x (cost of 1"
pipe). Sonotube is cheaper and lighter in larger sizes.
Matt D.
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