Re: Secondary Dilemma

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <FutureT-at-aol-dot-com>

In a message dated 11/25/01 12:26:22 PM Eastern Standard Time, 
tesla-at-pupman-dot-com writes:

CJ,

There's nothing special about a 1:2 or 1:4 ratio.  I often use a
1:5, or 1:6 ratio, and the results are just as good.   You should
make your secondary at least 24" tall to prevent secondary 
breakdown.  I would probably make the secondary 28" tall for 
your coil.  You want to have enough inductance to help keep
the gap losses low, and as an aid in quenching. 

Cheers,
John
--

> I have read that it is better to keep the ratio of width to height low, like
>  1:2 - 1:4. I knew this when I was getting into my project but I couldn't
>  find a wider pipe so I ended up getting a 4 inch pipe. I made the primary
>  which looks really nice in my opinion  I didn't want to make a site, but 
you
>  can see some of the pictures here http://members.home-dot-com/fredmoore/ (I 
used
>  my new toy, a Sony DSC-F707 digital camera) to take them. Anyway, so I have
>  a 4 inch coil but I have not finished winding it yet. Right now I am bout 
16
>  inches in to it. I am winding using 22 gauge heavy insulation wire and
>  polyurethane if that makes any difference. The rest of my coil (as of now)
>  is 2x 9kv 60ma NSTS for a total of 120 ma. I have a Maxwell pulse cap (wish
>  I had a MMC) that's rated at 35 kv .03 uf. The primary is 3/8 copper piping
>  with 3/8 spacing, on all lexan form :-). So my question is basically should
>  I continue wrapping and have a ratio of 1:5 or higher (could make it as 
high
>  as 50 inches) or should I stop now with the 16"?
>  
>  Thanks,
>  CJ