Alternate/Unusual Primary Configurations

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Breneman, Chris" <brenemanc@xxxxxxxxxxxxxx>

Hello,
There's been some discussion about internal primaries lately, and I 
was wondering if there are any other primary designs which could 
possible be easier to build or more efficient than a classic flat 
spiral or helix.  For example, could a primary wound externally on 
the same former as the secondary but several inches below where the 
secondary winding starts work?  Or what about a primary actually 
wound on top of the lower part of the secondary windings, 
sufficiently insulated?  What are the consequences of such schemes 
and would they work at all?

Thanks,
Chris



-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Thu 4/12/2007 4:34 PM
To: tesla@xxxxxxxxxx
Subject: Re: Tesla coil on Ebay; 80-300' lightning?

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Not very well. Larger secondary diameters are needed. Given turn
requirements to meet inductance's needed, 8" is too small to be
practical. You would end up trying to wind a 6.5" diameter coil and
it would have to be helical adding to the difficulty with coupling,
placement, and mechanical winding. Either external or internal is
electrically/magnetically equivalent, but practicality is best
external with that small of a coil.

Take care,
Bart

Tesla list wrote:

>Original poster: "david baehr" <dfb25@xxxxxxxxxxx>
>
>
>Hmmm, would a internal pri work with a smaller coil , say 8" dia. ????
>
>
>From:  "Tesla list" <tesla@xxxxxxxxxx>
>To:  tesla@xxxxxxxxxx
>Subject:  RE: Tesla coil on Ebay; 80-300' lightning?
>Date:  Tue, 10 Apr 2007 19:33:17 -0600
> >Original poster: "Hans Schattenmeister" <klugmann@xxxxxxxxxxx>
> >
>
>. The coil was 5' in diameter, had an
> >internal primary and stood about 25' tall.
> >
> >
> >
> >
> >
> >
>
>
>
>----------
><http://g.msn.com/8HMBENUS/2734??PS=47575>MSN is giving away a trip
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>
>