Re: inflatable torroid

Jeff, Terry, all

I've just had a brainwave - how about using flexible glue (eg impact or
thin silicone) to attach pieces of metal fabric to the tube - this would be
both low resistance and very flexible so the tube could be deflated without
fear of losing the coating. I may have a browse around to see if I can find
some fine-guage copper or aluminium cloth.... My 36" x 6" duct toroid
presents some significant transport and storage difficulties!

I know you can also get metallised lycra fabric in John Lewis here in
London, which would have even more 'stretch' but may be too high resistance
and possibly ignite. Maybe I'll test a bit of this with my NST or my
flyback circuit to see what it can take.

Alex Crow

From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com
Subject: Re: inflatable torroid
Date: 25 July 1999 02:52

Original Poster: "Jeff Corr" <corr-at-enid-dot-com> 

What a neat idea!  A kid's inner tube at Kmart is about 20-25" in diamter
and would work very well.  I might have to try that.  Any word on the paint
eating through the rubber surface?

-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Saturday, July 24, 1999 3:22 PM
Subject: Re: inflatable torroid

>Original Poster: "Alex Crow" <user-at-alexcrow.clara-dot-net>
>I was thinking of large inner-tubes as a possibility. You could spray
>conductive paint onto the surface of the tube and if this didn't crack
>it dried it should work OK. Some people I think have had success with foam
>toroids coated with graphite or similar.. so this should be possible.
>However inner-tubes are now rare of course - perhaps kid's inflatable
>might be an alternative, or a cheap inner from a fishing float-tube. If
>paint doesn't work, I would think that you could glue on coarse
>aluminium/copper powder or particles.
>Alex Crow
>From: Tesla List <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: inflatable torroid
>Date: 24 July 1999 01:10
>Original Poster: Terry Fritz <twftesla-at-uswest-dot-net>
>Hi All,
> I was wondering about a torroid made from metalized mylar or some other
>inflatable metal coated plastic.  The home center store as heating duct
>that looks like it is some thin plastic coated with aluminum and supported
>by a spiral spring wire to give the tube shape.
> I was wondering if the thin metal over plastic coating would just burn
>away or if such tubing could be of use.  The pipe looks like it would be
>stronger than typical aluminum duct when it comes to getting banged
> Also one should be able to make or find the materials to make an
>inflatable torroid out of metal coated plastic like those party balloons
>and some food products come in.  I wonder if it would have bad RF
> I have never tried any of this but though I would see if anyone has only
>thoughts on this.  The big aluminum duct torroids can get smashed easily
>and they sure take up a lot of room (especially in the car).  An
>version would sure be neat if it would work.
> Terry