Re: [TCML] how much does secondary diameter affect efficiency?

[bturner@xxxxxxxx]

Not sure if it's efficiency or simply a design parameter - I've always
done it sort of backwards. Using the total primary input power
(transformer capacity) and the old-school rule of thumb of 12" discharge
per 500w input power, I determined the anticipated discharge length and
made the secondary form at least that high. At least for smaller systems.
My big system throws 72-76" discharges from a coil form only 24" tall x
10" diameter. However, I also put acrylic 1/4" discs inside the form to
reduce internal corona (and breakdown). Been running it for YEARS without
problem. In part, the graduated e-field helps with this. If the system is
in good tune, that gradual field should preclude breakdown.

- b





> James,
>       Coil diameter has little to do with efficiency, and too large of a
> secondary will make your coil look unimpressive...  Go with the 4 inch,
> and don't look back...  I use 4.5 inch for about 3 kW with no problems
> at all...
>
> Scott Bogard.
>
> On 2/28/2012 4:48 PM, James Hutton wrote:
>> Hello, I'm about to begin building a 15kv 120ma coil.I read somewhere
>> that with powers over 1.5kw, you should be using atleast 6inch PVC.I
>> have lot's of spare 4inch PVC, but I can't seem to find any 6inch at any
>> local hardware stores. (except for 10ft long 6inch sewage pipes for
>> $70)So I'm just wondering if it is absolutely necessary to go bigger
>> than 4 inch when using 1.8kw, and how much it would affect the
>> efficiency of the coil if I use 4 inch instead of 6.(also, If I do use 4
>> inch, how long should my windings be?)
>> thanks!
>>
>> -James Hutton 		 	   		  _______________________________________________
>> Tesla mailing list
>> Tesla@xxxxxxxxxx
>> http://www.pupman.com/mailman/listinfo/tesla
>>
> _______________________________________________
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>
>


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