Re: Secondary size

• To: tesla-at-pupman-dot-com
• Subject: Re: Secondary size
• From: Hollmike-at-aol-dot-com (by way of Terry Fritz <terryf-at-verinet-dot-com>)
• Date: Sat, 17 Oct 1998 10:04:37 -0600
• Approved: terryf-at-verinet-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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