From: Michael Nolley [SMTP:mhnolley-at-willamette.edu]
Sent: Thursday, July 02, 1998 6:46 PM
To: Tesla List
Cc: 'Tesla List'
Subject: Re: Poly Caps
On Thu, 2 Jul 1998, Tesla List wrote:
> From: Larry Bud Melman [SMTP:gasman-at-althea.a-line-dot-net]
> Sent: Thursday, July 02, 1998 12:55 AM
> To: Tesla List
> Subject: Re: Poly Caps
> Some large diameter pipe is available, constructed of HDPE. I've
> been having a bit of trouble finding a coilform for a large coil I have in
> the works, and I've just become aware of this. I'll bet HDPE is an absolutely
> ideal coilform material. I'm going to do a sec'y in the 16 - 20 inch range,
> about 48-60 in tall.
> If no one is aware of probs with HDPE coilforms, I suggest that
> those of you looking for larger coilforms try commercial pipe shops
> specializing in sewer mains...that's where I found some. Unfortunately,
> I'm still looking for an appropriate scrap (it comes in 40 foot lengths...
> Also tends to be thick-walled and very heavy; one example of a 20 inch
> specimen had a 0.6 inch thick wall, and the guy said it was 16 lbs/foot!!
> On this basis, it might be a bit impractical unless one could find thinner
> stock. Anybody out there finding large diameter PVC??
yes... I happened upon a bit of luck 2 years ago, I stumbled upon some 6
inch HDPE which I was planning to use on a Van de Graff. Now it is wound
with 500 turns of 14 AWG-- I have a coax primary already wound-- I'm
planning to use 15-20 MOT capacitors in series/parallel for the cap, and
hopefully I'll find a pig to go with them-- But that is still at least a
year off until I can get the money, experiential background, and theory
behind me :). Another, smaller coil is in the works--
I found the pipe at Home Base, it was the last one they had, they
said it had been discontinued. Too bad for coilers I suppose... But some
of it is presumably still out there or being manufactured in different