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Re: [TCML] Q,,question





If you go thru all this trouble producing a copper ribbon you run into another, and more serious, problem --- corona.

The edge of the ribbon is very sharp as compared to the well rounded surface of a 3/4 inch ID copper tubing. This effect produces a lot of corona sweeping up the coil and will start to deteriorate the coil especially in high performance coils that have a spark length = or greater than the sec coil length.

If you use a copper ribbon and shoot some B&W 30 sec time lapse photos you will see a large amount of nearly invisible (to the human eye) corona sweeping up the coil. Try the same with copper tubing and the effect is very minimal.

I did this experiment near 40 years ago with an old B&W camera, and never again use copper ribbon for any of my primary coils. Copper tubing is the best and certainly the most reliable solution.

Dr. Resonance

Resonance Research Corp.
www.resonanceresearch.com


----- Original Message ----- From: "mark olson" <kc5gym@xxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Thursday, December 06, 2007 5:04 AM
Subject: Re: [TCML] Q,,question


At 10:40 PM 12/5/07 -0800, you wrote:

Splitting is nothing,vertical dremal attached to a flat surface,
What would be the size of this ribbobn,,,my math dont work that well?

The inductance I can measure and compare to primary,,;))
Regards
> > >
> > > Sirs,
> > > Would it be better to split a roll of 7/8" copper coil, and roll it
> > > flat?
> > > Seems more area would mean more "skin depth area"???
> > > Regards
> > > j.
> > > .

the resulting ribbon made from a tube (assuming no waste) = pi * D where D is od of tube. so 7/8 = .875 hence .875(3.14)=2.747 or about 2 3/4 inch ribbon

marko
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