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2 Layer Secondary.


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From:  Zuma [SMTP:mwise-at-ns.sosis-dot-com]
Sent:  Thursday, February 19, 1998 2:45 AM
To:  tesla-at-pupman-dot-com
Subject:  2 Layer Secondary.

I understand that if I wind two indentical windings, one on top of the
other. That it will successfully lower the resistance thus leaving the
frequency, capacitance and the inductance alone, Corrrect? With the
lowered resistance wouldn't allow for easier voltage flow or am I just
way off base here? The reason I ask is that I am going to attempt a
small 2 layer coil specifically for indoors. I am going to use a 3.25"
o.d. pvc pipe, with a 3:1 or a 4:1 ratio to height. The power supply,
though small, is a 7.5kv-at-60ma. I am going to use an existing primary I
have from a 4" coil. On the 4" coil it had 1" spacing from secondary to
primary. Given the size of my new coil, I should end up with abou 1.5"
spacing between the two. The only thing I haven't decided it the size of
wire to use on the secondary. I have about a 7-8lb spool of 22awg magnet
wire that I bought about 2 months ago, I bought it to wind my 6.25" coil
and I still have a good 7lbs at least, the spool size was originally a
little over 10lbs. I am almost tempted to go ahead and use the 22awg
because it is readily availible, but on the other hand I could have a
better performing coil if I go with 24awg or even better 28awg. I am not
looking for extreme output here, I would say probably about 12" or a max
of 18" considering it would defeat the purpose of having a small scaled
indoor coil. Given the input power what do any of you think this coil is
capable of? If I can obtain a small quantity of 24 or 28awg wire in a
size of no more than 2 or 3 lbs, I will most definately wind a coil
using a smaller gauge wire. But given what I got more than likely I will
just use 22awg.

Another qustion I wanted to ask. Any of you that have wound
multi-layered coils, Was there an increase in output at all? I would
think that even though that most of the calculations will reside at what
they are set at and the resistance will drop. Would the lower resistance
encourage a longer spark? Now I am not talking like huge differences, I
am talking about output in the range of a few inches.

Chris