Re: Mark's Big Coil
Subject: Re: Mark's Big Coil
From: mrbarton-at-ix-dot-netcom-dot-com (Mark Barton)
Date: Thu, 23 Nov 1995 02:25:22 -0800
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>I am also very curious about this MONSTER coil.
>How do you maintain a 50KVA fuse ????
We use circuit breakers.
>Can you explain the gap system in more detail?
The gap was a hair-brained scheme of mine which consisted of two
interrupters in series. One interrupter had a 16" fiberglass wheel
with many electrodes and ran at 3300rpm. It also had 4 stationary
electrode sets which were wired in series. This was dubbed the
"quenching interrupter". The other interrupter ran at variable speed
and had only 4 electrodes in the wheel. The stationary electrodes
covered a significant arc of the wheel so you were guaranteed some
period of simultaneity with a high speed electrode coming into line.
This was the "timing interrupter" and set the break rate. So we had
the best of all possible worlds, a variable break rate interrupter that
always ran at top speed!
>Were the gap electrodes tungsten when you talk of "melting metal" ?
They were 1/2 inch solid copper. I've seen too many people, including
Bill Wysock, melt down tungsten and I had no desire to pay for that
during experimentation. Also, it has been my experience that copper
lasts nearly as long! A spark gap operates at the boiling point of
whatever metal is used. Therefore, tungsten gaps run MUCH HOTTER, and
I thought that was not good for quenching either.
>How many series gaps were there?
We eventually abandoned the high speed wheel and went with the timing
wheel and 6 series gaps, but these were rather hokey and I'd rather not
talk about it.
>How do you controll the current of such a coil?
Since the coil ran on DC, we could control the power by the break rate
and by raising and lowering the core into and out of the charging
>Sorry about all the questions.
No problem at all. Pictures soon.
>If you used the tank for a magnifier, theoretically you could get
>allmost 100 foot of arc in a highly tuned system! Though Ive been told
>that Bill Wysock(a well known coiler) may have fallen short of this
>with 40-60 foot arcs! Still big sparks allright.
>Though I believe you could still get 40-60 footers with that
>kind a' juice going in.
If Bill got 40-60ft, I haven't heard about it yet, but would love to
see it. His system runs on 100KVA.