Re: Secondary size

• To: tesla-at-pupman-dot-com
• Subject: Re: Secondary size
• From: bhelms-at-dialpoint-dot-net (Brian Helms) (by way of Terry Fritz <terryf-at-verinet-dot-com>)
• Date: Tue, 20 Oct 1998 07:01:33 -0600
• Approved: terryf-at-verinet-dot-com

I built a secondary that was 500 turns of #22 enameled wire on a 8 inch form
and it didn't work at all.  I couldn't insulate between turns enough to keep
it from arcing from top to bottom and all around on the secondary.  It did
put on a heck of a show before it started smoking though.

Brian Helms
(KD4RLD)

-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Saturday, October 17, 1998 6:26 PM
Subject: Re: Secondary size


>Original Poster: Hollmike-at-aol-dot-com
>
>In a message dated 10/16/98 5:49:53 AM Mountain Standard Time,
>tesla-at-pupman-dot-com writes:
>
>> Knowing this length you can design a
>>  secondary coil that will give you the maximum inductance without
>>  overloading the power transformer.
>John C.,
>   Based on the Wheeler equation, the maximum inductance of a coil with a
>given length of wire occurs when the radius/winding length is 1.1111(or
10/9).
>That would produce a very short, fat coil that would not necessarily be the
>best geometry for a TC secondary.  Tesla did use coils that were relatively
>short, with a large radius, but I believe he found it necessary to space
wind
>the coils to prevent excessive voltage stresses between the turns.
>   Has anyone built a coil with such a geometry?  If so, how did it work?
>MIke
>
>
>

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