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Re: [TCML] Q,,question



A relatively equivalent value for tubing vs. flat ribbon is the outer surface of the tubing. So, for a 2" height ribbon, an equivalent tube size would be 2"/pi (about .64" diameter). Ribbon can basically get a large surface area into a compacted area. Edge corona, yes.

Take care,
Bart

David Rieben wrote:
Hi Chris, Gary,

I'm going to have to respectfully disagree with you here, Chris. If you were to split a length of copper tubing length-wise, then you
would effective double the surface area, since the previously
unexposed inside of the tubing will now be exposed. However,
as Gary has stated, you would also add other losses that would more than negate whatever gains that you obtained by doubling the primary coil's effective surface area. And I would hate to even think about TRYING to NEATLY slit a 50 ft. section of copper tubing into a nice smooth ribbon ;^(/ I'm with Gary, I would prefer copper
tubing/pipe to copper ribon anyway as I find it much easier to work.

David Rieben

-------------- Original message -------------- From: "Chris Swinson" <list@xxxxxxxxxxxxxxxxxxxxxxxxx>
----- Original Message ----- From: To: "Tesla Coil Mailing List" Sent: Wednesday, December 05, 2007 6:29 AM Subject: Re: [TCML] Q,,question

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 surface area will still be the same. Chris



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You may realize some gain with the larger surface area, but I would expect losses to increase even more because of eddy current losses. You would also increase losses due to corona off of the sharper edges.

And more significantly, how on earth would you do that, and not have it look like a mess? You can find copper ribbon on eBay, but even so, I would choose tubing over ribbon.

Regards, Gary Lau
MA, USA
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