If you don't want to use fibreglass, I recently used papier-mache with
wall paper paste as the adhesive to form a rigid structure on top of a
foam former.
To harden the outer layers further, I used a top coat of plaster of
paris with 50/50 mix of PVA and water then sanded smooth. Should work
fine over an inner tube.
This worked very well. Very cheap and not half as 'aromatic' as the
fibreglass.
Derek
On 27/11/2013 15:06, Nick Andrews wrote:
> 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
>>
>>
>>
>>
>> _______________________________________________
>> Tesla mailing list
>> Tesla@xxxxxxxxxx
>> http://www.pupman.com/mailman/listinfo/tesla
>> _______________________________________________
>> Tesla mailing list
>> Tesla@xxxxxxxxxx
>> http://www.pupman.com/mailman/listinfo/tesla
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
--
Web:www.extremeelectronics.co.uk <http://www.extremeelectronics.co.uk>
Twitter @ExtElec <https://twitter.com/ExtElec>
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla