During my early coiling days, I was using helical coils that were typically a 2:1 ratio in diameter of primary:secondary. I use #8 soft-drawn copper wire (used on distribution systems). Arcing to the secondary was not an issue, even with 40"+ arcs. Rudimentary, but was a learning experience:http://www.fototime.com/00154DA78883680/standard.jpg
Terry
From: Tim Flood <tflood@xxxxxxxxxxx>
To: daniel_kline7657@xxxxxxxxx; "tesla@xxxxxxxxxx" <tesla@xxxxxxxxxx>
Sent: Thursday, December 6, 2018 3:40 PM
Subject: Re: [TCML] Bipolar Primary Diameter
The primary has ten turns of 1/4" copper tubing supported on a homemade
plastic tube; the secondary is 26 ga. wound 22 1/2".
I would be glad to provide more when I can access my file at home.
Tim
On Thu, Dec 6, 2018 at 3:57 PM Dan Kline via Tesla <tesla@xxxxxxxxxx> wrote:
> Thanks,Tim.
> I should have mentioned that my secondary is 4 inches in diameter. So
> you're doing a little over double your secondary diameter. You get no arcs
> to the secondary? Do you mind telling me how your primary is made? I was
> thinking of just doing some turns on a section of sonotube...
> Regards,Dan K
>
> From: Tim Flood <tflood@xxxxxxxxxxx>
> To: daniel_kline7657@xxxxxxxxx; "tesla@xxxxxxxxxx" <tesla@xxxxxxxxxx>
> Sent: Thursday, December 6, 2018 7:12 AM
> Subject: Re: [TCML] Bipolar Primary Diameter
>
> I don't know of a rule of thumb. But I can say that my bipolar has a 8"
> diameter primary with a 3 1/2" dia. secondary.
> Hope this helps.
> Tim
> On Wed, Dec 5, 2018 at 7:41 PM Dan Kline via Tesla <tesla@xxxxxxxxxx>
> wrote:
>
> Hi All,Is there a rule of thumb for how large in diameter to make a
> cylindrical primary for a bipolar coil?Thanks,Dan K
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