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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 > _______________________________________________ > Tesla mailing list > Tesla@xxxxxxxxxxxxxxxxxx > https://www.pupman.com/mailman/listinfo/tesla > _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla