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Re: Primary Coil Shape



Subject:  Re: Primary Coil Shape
  Date:   Fri, 25 Apr 1997 22:53:37 +0500
  From:   "Alfred A. Skrocki" <alfred.skrocki-at-cybernetworking-dot-com>
    To:   Tesla List <tesla-at-pupman-dot-com>


On Thu, 24 Apr 1997 01:31:57 -0400 Lord Talimar
<lordtali-at-mill.tds-dot-net> wrote;

> I have been reading this list for quite a while now, and am getting
> ready to start building a new coil.  My first (and probably biggest)
> question so far is what shape of primary should I use as a beginning?

Greetings LT, the general opinion is that it makes no difference 
what shape primary you use, although my personal experience is that 
the flat spiral and the inverted cone or 15 degree primary have less 
tendency towards primary to secondary arc over than the cylindrical 
spiral. Given the fact that an inverted cone or 15 degree primary is 
more difficult to make than a simple flat spiral, I would recommend the 
flat spiral.

> Also, I saw in one magazine (Popular Electronics?) while I was still
> in High School, that one made a TC with a square primary, flat rolled.
> Would this work better or worse than a round flat and/or cylindrical
> wound coil?

I remember the article you mentioned, and if I remember correctly the 
coil in question used less than 6KV on the primary, if it used much 
more it would have invited severe coronal losses at the corners. 
Remember the smaller the radius of curvature a surface has the 
greater the coronal losses. The square shape is also much more 
difficult to make and offers no advantage over any other shape. 

                               Sincerely

                                \\\|///
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                           Alfred A. Skrocki
                   alfred.skrocki-at-cybernetworking-dot-com
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