Re: Backwards primary?

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

Original poster: "Steven Ward by way of Terry Fritz <twftesla-at-qwest-dot-net>" <srward16-at-hotmail-dot-com>

I understood what the original post meant.  The backwards primary would 
leave you with low coupling, which means less power to sparks.  You also 
should not take the form out of the coil.  You will get all kinds of 
insulation problems.  I had a coil on a VERY thin form and it would arc 
alond the inside of the coil because there wasnt enough insulation.  But 
keep in mind that i was stressing this coil insanely!  The coil was 2" 
diameter 14" tall 28awg with a 12" diamter sphere!  I was getting about 30" 
arcs from my 12/30 with 1/2 the shunts removed.  The sphere being rather 
large had a very high breakdown voltage and eventually ruined my coil, so i 
stick with toroids.  But back to the topic, leave the coil on its PVC, you 
really wont loose too much spark unless you have some very bad pipe (like if 
it was in water and you didnt dry it out).  To reduce the strikes to the 
primary, make the toroid larger in diameter than the primary so it will arc 
outward rather that down to the primary, and make the primary flat.


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: Backwards primary?
>Date: Thu, 03 Oct 2002 08:24:21 -0600
>
>Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz 
><twftesla-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>
>
>Tesla list wrote:
> >
> > Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
><Beans45601-at-aol-dot-com>
> >
> > I was wondering, Would it help anything if you made a primary that,
>instead of
> > starting at the primary and going up, it went from the secondary down? I
>am not
> > sure if i said it right, but, i think you get the idea. It seems that it
>would
> > cut down on the primary strikes...
>
>If this is equivalent to wind the primary in a different direction,
>no difference at all.
>
> > Also, it is possible to wind your secondary
> > and take out the pipe? What would be the pros of doing this?
>
>You will obtain a more fragile secondary, after a lot of work.
>No measurable advantage, unless your form is very, very, lossy.
>
>Antonio Carlos M. de Queiroz




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