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4hv.org :: Forums :: High Voltage
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HV "Pinwheel", round jacobs ladder

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Nik
Fri Nov 02 2007, 02:25AM
Nik Registered Member #53 Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
I was home again today and able to work more on my HV stuff. I went ahead to see if higher voltages and currents had much of an effect on the arc and found somthing a little strange. The outer end of the arc lead the inner end by quite a bit once I moved the 2 rings apart. It caused a kind of "swooping" shaped arc visible in the movies and a little bit in the image below. I also noticed that the slower the arc spun the more likely it was to stick or jump to another place but this may have to do with imperfections in the metal rings.

15kv 60ma NST halfwave rectified supply

Movies
Link2
Link2

1193970324 53 FT33445 Dsc01570
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Firnagzen
Fri Nov 02 2007, 03:13AM
Firnagzen Registered Member #567 Joined: Tue Mar 06 2007, 10:55AM
Location: Singapore
Posts: 147
Oooh.... Swirly white flames...

Now go compete with TDU. He's got a multiple ring version now.
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Dr. H.
Thu Nov 29 2007, 06:39PM
Dr. H. Registered Member #931 Joined: Mon Jul 30 2007, 05:25PM
Location: Bulgaria
Posts: 486
Hi guys. I have a question - what determines the spin direction ?. I've experimented with an AC flyback and a 30Kv diode and i found out that in the one polarity the spark stays at one place and in the other polarity it spins nicely.
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Nik
Thu Nov 29 2007, 11:08PM
Nik Registered Member #53 Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
The left (or right hand, depends where you come from) rule determines the spin direction based on the current direction and the magnetic field polarity.
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