Re: Results vs coil size

To: tesla-at-pupman-dot-com
Subject: Re: Results vs coil size
From: Richard Hull <hullr-at-whitlock-dot-com>
Date: Fri, 09 Aug 1996 13:04:32 -0700
Tesla List wrote:
> 
> >From Esondrmn-at-aol-dot-comThu Aug  8 14:04:51 1996
> Date: Thu, 8 Aug 1996 14:38:55 -0400
> From: Esondrmn-at-aol-dot-com
> To: tesla-at-pupman-dot-com
> Subject: Re: Results vs coil size
> 
> In a message dated 96-08-08 04:01:49 EDT, you write:
> 
> <<
>  I've seen the photo of your coil Ed. Have you thought about using a
>  terminal with a much larger radius of curvature? (Note : this is NOT
>  defined by the major toroid diameter but by the tube diameter).
> 
>  Malcolm  >>
> 
> Malcom,
> 
> I have built three toroids so far.  The first was 14" in dia. and about 5"
> thick, made from styrofoam.  The next one was 33" in dia. and made from 6"
> dia corrugated plastic drain pipe.  The one I am currently using is 40" in
> dia. and also 6" in dia.  I did try laying the 33" toroid on top of the 40"
> one time.  I did not notice much difference in performance but I am not
> entirely sure that I got the system retuned properly.
> 
> Do you think a toroid of the same capacitance only twice as thick would
> perform better?  Looking at my notes, I show the actual diameter to be 5" and
> the capacitance to be about 38 pf.
> 
> Ed Sonderman


Ed, all,

The surface area of an object is the ONLY determining factor involved in 
it value of isotropic capacity.  Shaded or electrostatically linked 
portions or areas of any terminal are of no value in this figure.  They 
are of prime importance in preventing corona, though.

 Geometry has no bearing at all on isotropic capacitance other than a 
sphere represents the greatest surface area per unit size of any 
geometry.  Geometry is very important as regards electrical breakout, 
however.  So once again we must juggle a lot of considerations which the 
real world application of a concept demands.

Increasing the cross section of a toroid raises the the breakout 
potential (demands more energy and produces longer sparks).  Increasing 
the diameter of the whole toroid, electrostatically shields the coil 
system and raises the capacitance in a simple linear fashion.

Richard Hull, TCBOR