Re: Toroid Design

• To: tesla-at-pupman-dot-com
• Subject: Re: Toroid Design
• From: Hollmike-at-aol-dot-com (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Wed, 23 Dec 1998 12:00:40 -0700
• Approved: twf-at-verinet-dot-com

In a message dated 12/23/98 12:17:02 AM Mountain Standard Time,
tesla-at-pupman-dot-com writes:

>  The right material is more like a thinwall
>  (0.005"?) aluminum bellows that's fairly stiff and is shipped somewhat
>  compressed. The 8" diameter material I purchased was about 2-2.5 feet
>  long, but would stretch out to about 7-8 feet. It will dent if you poke
>  it hard enough or drop the toroid, but otherwise is pretty robust. 
>  
     I was wondering if anyone using the aluminum duct has tried filling it
with expanding foam insulation after the ends have been sealed.  I figure it
could be injected through a small hole punched into the toroid along the inner
radius so it would not be seen.  So far, I have been careful(or lucky) and
have not dented mine, but thought that this might make them a little sturdier
without adding too much weight to them.
Mike

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