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Re: [TCML] Bi-Polar coil construction plans/tips/etc ?
I think it should be possible to get sparks longer than the secondary.
To do this
long arms would have to reach out high and wide above the horizontal
from each end.
Perhaps toroids would be needed on top of the arms to increase the spark
lengths. Breakout points may be needed also. It would become a monstrous
I once made a bi-polar coil that produced sparks longer than the
secondary. Actually, there were three coils: The bipolar secondary, and
an additional vertical coil on each end of the bipolar coil. The
secondary coil was inside a lucite tube, and the additional coils were
connected to the secondary by copper tubing. The primary coupling was
fairly tight and sparks would play all over the lucite if the additional
coils weren't breaking out at their breakout points.
The additional coils were mounted to the tops of 8" cardboard
concrete-casting forms. I could move them as far away from the
primary/secondary as I wanted to.
The only problem was that the additional coils required very large
toroids, otherwise I would get primary/secondary spark-over from the
tight coupling. And by the time I added in the additional coils and the
large toroids, the operating frequency was so low that I couldn't find a
really good tuning point even with a 30-turn helical primary. I should
probably have built it much smaller.
The secondary was 4" x 4', wound with #28 and the additional coils were
6" x 22", wound with #24. The toroids were aluminum ducting, 8" x 24".
I did manage to get arcs across the toroids that were longer than the 4'
secondary. If I was to do this again, I would halve the dimensions of
everything to get the apparatus into a decent operating frequency range.
Oh, and the secondary was continuously wound all in one direction.
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