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Re: inflatable torroid

Probably the best inflatable whatever strategy is to use the inner tube or
beach ball or balloon as a form. You can lay up fiberglass or plaster of
paris over it to make a rigid shell or a female mold.

My own experiences with painted anythings have been quite grim. The coating
comes off, burns off, or is too thin or resistive to support the discharge
current (which is quite high).

However, I did make a fairly good sized papier mache spheroid for a van de
graaf. It was a ton of work to get it smooth, etc., but, the material cost
was low.

----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: inflatable torroid
> Date: Sunday, July 25, 1999 7:25 AM
> 
> Original Poster: John Williams <jwilliams-at-edm-dot-net> 
> 
> I did once see a coil where this was done successfully.  For the
> torroid it had a truck innertube covered with aluminum foil.
> 
> Any painted or metalized surface would just blow off.  Copper
> or Aluminum foil would be ok.  Of course you have to smooth
> it down reasonably well.
> 
> And every time you set up you have to re-inflate and re-foil the
> tube.
> 
> 
> 
> 
> 
> >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
around.
> >
> >	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
> >characteristics?
> >
> >	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
inflatable
> >version would sure be neat if it would work.
> >
> >Cheers,
> >
> >	Terry
> 
> 
> 
> 
> 
>