Re: Notes-Questions-Article-All

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Parpp807-at-aol-dot-com>

In a message dated 9/1/01 12:45:01 PM Central Daylight Time, tesla-at-pupman-dot-com 
writes:

David and Dean,

The material I have been discussing in several posts is called "Superflex" in 
the
McMaster-Carr catalog. It is 0.005 inch aluminum if fully expanded. It is 
semi-rigid
and very tough stuff. Evidently it's annealed aluminum. There would be no 
need to pressurize this material; it wll hold its shape.

Ralph Zekelman

<< >Toroid Design:  Has anyone tried joing the ends of flex duct with a
 >pressure tight seal.  If it could be done then the flexduct toroid could be
 >slightly pressurized.  This would add more rigidity and immunity from small
 >bumps.  If a seal is not possible then maybe a balloon or an innertube?
 
 I tried that once. When the duct has pressure applied to the inside it has a
 tendency to twist. Instead of a toroid, I ended up with a figure 8. Ruined a
 good piece of 8" duct that way.
 
 later
 
 deano
  >>