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Re: Secondary Tubing.



I have used 6" dia tubing it seems to work fine.  The phenolic is paper
based and is very rigid and lightweight.  I did coat the inside and outside
with multiple coats of polyurethane varnish.  I also added inner plexiglass
barriers to discourage interior flashover.  The only slight downside of this
tubing is a shallow spiral groove present on the surface of the tube from
the manufacturing process.  Note that the term phenolic is used loosely
here, the tubing is more paper based than many phenolics I have seen in the
past.  Prices for this material are reasonable, a 5 foot section cost me
about $26.00.  There is G-10 material available in 4 to 6 (maybe larger)
diameters but is expensive, about $100.00 for a 5 foot section.
Jeff Metschuleit

-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Saturday, April 22, 2000 2:20 AM
Subject: Secondary Tubing.


>Original Poster: "Charles Arruda" <carruda-at-channelseek-dot-com>
>
>Has anyone ever tried using "PHENOLIC AIRFRAME TUBING" used in
>Model Rocketry?  I looked up the specs on Phenolic materials
>and they are used in transformers and electronic equipment.
>
>Here is a source of the tubing (there are bunches of rocketry
>suppliers):
>http://www-dot-commonwealth-dot-net/rockets/pml/
>
>Here is some information about the material with electrical
>specs:
>http://www.sdplastics-dot-com/phenolic.html
>
>What caught my eye was the following description:
>"High mechanical strength, high arc and heat resistance,
>self-extinguishing, excellent electrical properties under dry
>and humid conditions"
>
>
>--
>
>Charles Arruda
>Channelseek, Inc.
>
>Email:  carruda-at-channelseek-dot-com
>Website: http://Channelseek-dot-com
>
>Channelseek is a proud member of the IWA
>http://www.webcasters-dot-org
>
>
>