Re: Primary types (fwd)

---------- Forwarded message ----------
Date: Sat, 02 May 1998 04:08:24 -0700
From: Michael Tucknott <Michael.Tucknott-at-virgin-dot-net>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Primary types (fwd)

Tesla List wrote:
> ---------- Forwarded message ----------
> Date: Fri, 22 May 1998 12:32:51 EDT
> From: Esondrmn <Esondrmn-at-aol-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: Primary types (fwd)
> In a message dated 98-05-21 14:29:11 EDT, you write:
> <<
>  Hi all
>  Can any body on the list give me some advice on building a cone shaped
>  primary coil.
>   >>
> The first large primary that I built was with 3/8" tubing on .75" centers.  14
> turns wound on a 30 degree saucer shaped acrylic form with 8.0" I.D. produced
> about 87 uh.  It worked well but I just rebuilt it in a flat pancake form.
> This will be a good test as I plan to run the coil again with the only change
> being the primary design.  It will be interesting to compare the performance
> of both types of primaries.  My smaller (3.0" dia) coil uses a flat primary
> made of #10 solid copper wire and works well.  I would suggest a flat pancake
> shape - I am not convinced that a saucer shaped primary has any advantages
> over a flat shape - it just results in the primary being closer to the top of
> the coil and that is not an advantage.  I would suggest to make the I.D. 6.5
> to 7.0" and use 12 to 14 turns to allow plenty of room for tuning and future
> modifications.
> Ed Sonderman

Thanks for the comments.

I`m going to built a saucer shape primary,30 deg angle with 14 or 15
this should help with the tuning a bit.
I will leave a gap of 1" between the first turn of the primary and the
secondary to help stop arc over.
Will post any results to ya.  
Hope to build another salt water bottle cap tank this weekend to add
some more capacitance to the tank supply,then I should get a discharge
the toroid. 

Cheers Mike Tucknott.