Re: Stacked Primarys

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "BRIAN FOLEY" <ka1bbg@xxxxxxxxxxx>

Hi, you said the stacked primary provided 165 UH. what was the single layer
coil you replaced have for inductance?  I wunder if the grey potting
compound could be used to sparate the two layers and still allow the outer
turns to be tuned? or maybe tune from the inside and pot the outside? just
dreaming but maybe being potted they could be closer together? maybe the
grey potting compound is out of this world priced? just dreaming ideas here.
cul brian f.
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, April 14, 2006 5:39 PM
Subject: RE: Stacked Primarys


> Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>
>
> Building a stacked primary will definitely give you a much more compact
> coil, and use less tubing.  I use one on my coil, details at
> http://www.laushaus.com/tesla/primary.htm.  You get the biggest boost in
> inductance by maximizing the mutual inductance between the two layers,
> i.e. keeping them as close to one another as possible.  Just be sure to
> use a layer of plastic between the coils with NO holes outside of the ID
> or the coils, or else an arc will surely find its way between the two
> coils.  Also, make sure the sheet extends at least 1.5" beyond the OD of
> the coils.
>
> Pete Komen wrote an Excel spreadsheet that calculates the inductance of
> a 2-layer primary very accurately.  I'll attach it so that Terry might
> post in on hot-streamer.com.
>
> http://hot-streamer.com/temp/2LayerPrimary.xls
>
> Regards, Gary Lau
> MA, USA
>
>  > Original poster: "Mike Tucknott" <michael.tucknott@xxxxxxxxxx>
>  >
>  > Hi Terry/Chip
>  >
>  > It`s been a few years since I`v been on the list but I though it was
>  > time to start
>  > building and I`m in need of a little help.
>  >
>  > I`m building a new big coil and the primary will need to be 40" dia
>  > if I stack 2
>  > 10 turn coils on top of each other how will this affect the overall
> inductance
>  >
>  > And does anybody have any advice on how to build a stacked primary,
> i.e. turn
>  > to turn spacing, coil to coil spacing and support structures etc.
>  >
>  > Cheers guys
>  >
>  > Mike Tucknott
>  >
>  >
>  > Smokin in south Oxfordshire UK
>  >
> <http://freespace.virgin.net/michael.tucknott/tesla.htm>http://freespace
> .virgin.net/mi
>  > chael.tucknott/tesla.htm
>  >
>
>
>