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Re: Stacked Primarys (Attn Gary L)

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Hi Scott,
I did a quick check on Pete's spreadsheet using Gary's coil dimensions comparing to FANTC for two flat coils. Seems like in Pete's spreadsheet, the separation distance is center to center. The turn to turn spacing is using edge distances.
Pete's spreadsheet seems very good according to Gary's measurements. There are a couple minor dimensional errors but they are truly minor in the overall and make only a slight change when corrected. The accuracy is still quite good as is! 

Here's a comparison with Fantc.

                      Lm       L per spiral      L coupled spirals
                     -----     ------------      -----------------
Pete's Spreadsheet    33.7uH       50.7uH           168.8 uH
Fantc Program         35.2uH       49.7uH           n/a
Gary's Measurements   n/a          46.0uH           165 uH

Pretty cool!
Bart


Tesla list wrote:


Original poster: "Scott Hanson" <huil888@xxxxxxxxxxxx>

Gary -
How did you interpret the input on line #9 of Pete's spreadsheet, "separation of turns"? Center-to-center distance between turns of the primary conductor, or air gap between adjacent turns? 

Regards,
Scott Hanson




----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, April 14, 2006 2:39 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
>