I have used a double truck inner tube in two ways. Neither worked well in
practice.
The first was covered in chicken wire. Ozone rapidly ate through the rubber.
At least, I thought it was ozone, to which rubber is very sensitive. Sparks
should not go inward from the mesh as it is a Faraday cage. It could still
be sparks equalising the flat area between the chicken wire perforations.
As a lower toroid, with very little in the way of sparks off it, it works
much better.
http://tesladownunder.com/Tesla_coil_18inch.htm#Toroid
The second was covered with aluminium covered tape. Lasted longer but all (?
3) versions eventually leaked with a shortish lifespan ? year or two. As
long as you apply minimal tension, they should not come out lopsided. I
don't know why they didn't last as long as suspected. They should really
have worked.
Otherwise they were great. Light, dent proof and smooth.
http://tesladownunder.com/Tesla18Dalek10003Ft.jpg
I have a tractor tube to try sometime. Much bigger.
Your mileage may vary.
Peter Terren
>> I recently had the two front tires swapped out in preparation for the
>> impending winter, and was told that one of the old tires had too much
>> wear for next spring.
>> Then it dawned on me - a car tire is basically a toroid! I drive a
>> simple Toyota Corolla so they are small/average size, weight is really
>> not that much of an issue for the 4" diameter coil form I have.
>> Has anyone tried using a car tire with maybe a couple wooden discs to
>> make a closed area, then covering the whole thing with AL tape?If you
>> have, what were the results? In principle do you think this would be
>> worth trying?
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