Desktop Bipolar Coil

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Dave Kyle by way of Terry Fritz <teslalist-at-qwest-dot-net>" <dave-at-kyleusa-dot-com>

I have some extra parts and was thinking of a small coil project that could
be run without grounds and counter poises. I also wanted something that
could be potentially run in the house with less risk to all the electronic
appliances.

A bipolar arrangement seems the logical choice. Rather than the popular twin
arrangement I am looking at a single horizontal coil and thought it best to
seek some advice.

Some initial design thoughts:

24 x 3.25 inch secondary wound with 30 gauge wire (2,O00 turns)
A classic 12 inch helical primary centered on the secondary
Propeller style SRSG
.025uf MMC LTR
7.5KV at 30ma nst
Raised 6 inch spheres on ether end of the coil provide a fixed 18 inch gap

I have run the numbers and they look promising. I expect it to make sparks
that will easily jump the 18 gap. Worse case I could always throw a 9KV nst
at it if the output was disappointing.

The number of turns on the secondary seems high but when thought of as two
separate coils is about right. Is my thinking here correct?

Your thoughts and comments would be most appreciated.

Dave


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Dave Kyle
Austin, TX USA
Email: dave-at-kyleusa-dot-com