Re: [TCML] New Toroid

[futuret@xxxxxxx]

Tony,

Congratulations on the improved results.  Yes, adding some
smaller 3" x 15" or 4" x 20"  toroids (or whatever size they are),
below the main toroid
will permit you to raise the main toroid.  This will greatly reduce
primary strikes as you suggested.   Filling in the center
of the toroids will not give any benefit.  That area is 
electrostatically
sheilded anyway by the toroids themselves.

Cheers,
John
----------------

-----Original Message-----
From: Sfxneon@xxxxxxx
To: tesla@xxxxxxxxxx
Sent: Sun, 7 Sep 2008 1:05 am
Subject: [TCML] New Torroid

Hello coilers,

I've been tweaking on my bombarder powered, static  vacuum aspirated 
gap, 8"
x 33" coil, and I just replaced the smaller torroid  stack with a much 
larger
8" aluminum flex duct torroid measuring 42" in major  diameter. I also 
went
from 27nF to 40nF and moved the primary tap in a round or  two, and 
upped the
input power to 200-300mA or so. Initial tests were very  successful 
once the
correct height above the last winding was found, but because  of the 
longer arcs

there was more of a tendency for primary strikes. Raising the  torroid 
helps,
but field control goes out the window and it wants to break out  at the 
top
winding. But when it's dialed in, arc length went from about 6  feet to 
around
8' or 9'. Still, too many primary strikes for comfort.

I've heard that by placing a small torroid or corona ring at the top  
winding
will suppress breakout there so that the main torroid can be elevated  
high
enough away from the primary to reduce strikes. Would one of my  
smaller 3" or
4"  torroids help with field control at the top winding,  allowing the 
big one
to be elevated a foot or more above that?

Also, the new torroid is supported by an "X" shaped support of 1" strap 

steel on edge, centered inside the torroid. Would it add significantly 
to the
capacitance to fill in the center with a 26" round piece of sheet 
metal?  The
coil has no problem breaking out now, so a bit more 'C' might help even 
more.

Thanks,

Tony Greer


 
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