Re: toroid size

• To: tesla-at-pupman-dot-com
• Subject: Re: toroid size
• From: "Malcolm Watts" <malcolm.watts-at-wnp.ac.nz> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Mon, 22 May 2000 17:03:24 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi Steve,

On 22 May 00, at 12:00, Tesla List wrote:

> Original Poster: "Steve" <Steve-at-g8cyerichmond.freeserve.co.uk> 
> 
> i was experimenting (actually my son reckons I was just playing) with one
of my
> mini coils the other day. Amongst the things I tried was changing the toroid.
> The coil is 1.1" dia 5" tall wound with about 850 turns. The coil has
operated
> happily producing sparks of about 2.5" many dozens of times. It is very tame.
> This time I changed the toroid to one which was only marginally larger in
> overall diameter, but with a fatter ring (about 50% bigger). I re-tuned the
> primary (about 1 extra turn). Sparks were now far larger, including
strikes to
> the primary (occasionally as long as 4.5" to a grounded point). I think that
> this illustrates clkearly the significance of the radius of curvature. I
was so
> encouraged that I looked out another former and intend to run a binary pair.
> Steve

It probably also reflects an improved primary Q and maybe a 
difference in the coupling constant as well.

Regards,
Malcolm

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