What I think you could do with the inner tube is to coat it with fiberglass cloth and resin for a lightweight structure, then cover that with foil tape after popping the tube (just cut off the valve stem).
Nick A
> Date: Wed, 27 Nov 2013 05:18:09 -0800
> From: drieben@xxxxxxx
> To: tesla@xxxxxxxxxx
> Subject: Re: [TCML] Car tire toroid?
>
> Hi Brian,
>
> Seems like that would be an awfully heavy and cumbersome topload for 4" coil,
> but that's just me ;^) I think a search of the archives may render some mentioning
> of large inner tube based toploads. IIRC, I personally mentioned the inner tube
> idea but was promptly brought down to reality by the fact that temperature changes
> would cause erratic size and firmness of the tube, barring storage in a carefully climate
> controlled environment, AND assuming no leakage! Even subtle changes in the
> internal air volume would prove quite problematic once the aluminum foil/tape
> coating is applied!
>
> David R
>
>
> From: Brian Hall <brianh4242@xxxxxxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Sent: Tuesday, November 26, 2013 5:41 PM
> Subject: [TCML] Car tire toroid?
>
>
>
> 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?
>
>
> ----------------------------------
>
> Brian Hall
>
>
>
>
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