Re: Notes-Questions-Article-All

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

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

anyone ever consider punching a small hole on the inside of their toroid and 
injecting that expanding foam insulation into it?  might add some rigidity to 
the toroid.  Don't know - just came to mind. 
Mike 



>
> >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 
>
>