Re: Formless secondaries Was: RE: Ryan's Coil = DOA :(

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

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-uswest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi All, Garry, 

I don't think internal arcs are a problem. Think of sonotube coils. That
cardboard isn't better than a thick coat. Whichever poly/resin/etc.. is used,
it would certainly be better than a lossy cardboard form. As a matter of fact,
the sonotube might be kind of "ideal" to use considering the waxed outer
surface. Once the form is removed, the coil should go through another cycle of
inner coats. One of the best methods posted on this list about a year ago was
to use a large pan filled with the coating. The coil is then set up to spin
through this coating. As it spins, it builds a very heavy and smooth coating. I
think a formless secondary would be "ideal". 

Just my 2 pennies, 
Bart 

Tesla list wrote: 
>
> Original poster: "Garry Freemyer by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> <Garry-at-NDFC-dot-com> 
>
> The trouble I see with this is that a non conducting form with baffles or 
> with no wire going inside, helps prevent arcing inside the coil. The air 
> inside of a secondary without a form might become ionized faster than the 
> air outside of the coil because there is less circulation inside than 
> outside and the air is completely surrounded by highly charged windings and 
> might have a lower break down voltage. Without the form, one might have arcs 
> inside the secondary where you can't see them! With a properly made form 
> that is thick enough to prevent puncture, the only sparks you have to worry 
> about are the ones you can see on the outside and one can employ a strike 
> rail on the outside as well. So, IMHO, a form is actually a good thing to 
> have. 
>
> -----Original Message----- 
> From: Tesla list [<mailto:tesla-at-pupman-dot-com>mailto:tesla-at-pupman-dot-com] 
> Sent: Wednesday, January 10, 2001 4:38 PM 
> To: tesla-at-pupman-dot-com 
> Subject: Re: Ryan's Coil = DOA :( 
>
> Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" 
> <Fucian-at-aol-dot-com> 
>
> Hmmm...Anybody thought of making a secondary with NO form?Well at first use 
> a 
> form but use some kind of compound to hold it together like papermache over 
> the form and then slide it off and remove the paper.This would be diff. and 
> fragile but I leave it up to those who have time and MONEY for this sorta 
> thing. 
>
> just a thought, 
> matt