Re: Dual toroid and efficiency tests

In a message dated 99-09-01 01:31:21 EDT, you write:

> I've been experimenting using your 14 x 4 smooth toroid with my larger 
> 18 x 4 and 20 x 6 corrugated aluminum ducting toroids. When I use just
> the 14 x 4 by itself, the streamers are uniform, but not that long. 


Do you obtain multiple streamers when you use the 4" by 13" smooth
toroid alone?  If so, have you tried attaching an aluminum foil bump to
form just one streamer?  (caution; if the bump doesn't make good 
electical contact it can burn the surface of the toroid and create a 
black burned spot)

> I stack the larger 20 x 6 on top of it, I have to re-tune, but the streamers
> are much longer using the corrugated aluminum ducting. I don't have
> another completely smooth toroid to compare using two of the smooth
> toroids together. 
> I get the best looking streamers using the corrugated 4 x 18 aluminum
> ducting topload. They are evenly distributed. 

How does the streamer length with the 4" by 18" corregated toroid alone 
compare with the streamers from the 4" by 13" smooth toroid alone?  Do
they give an equal number of simultaneous streamers?

Lou Balint has told me that when he placed one of my smooth toroids 
on his coil, he obtained multiple streamers, and could not force it to
produce just one streamer even with a breakout point,  but the streamers
were only 30" or less.  When he installed a much larger corregated 
toroid, he got just one streamer, and it was somewhat longer.  I don't
know why some coils are producing shorter multiple 
streamers, and others produce longer but only one or two streamers
using the same smooth toroid.  I probably depends on the TC output
voltage, tuning may have an effect too.  I've noticed in general that
tuning outwards a little often tends to reduce the number of streamers
and gives longer sparks.

Thanks for the interesting report and experiments.

John Freau

>When I stack the larger
> 20 x 6 corrugated aluminum toroid on top of the smaller one, I get
> the longest streamers, 43" so far. The breakout point is the joint
> of the toroid using aluminum tape. The streamers prefer to emit
> from the taped joint. I'm using a 15/60 900va NST.
> I have fun with your smaller 14 x 4 toroid by placing it on a 6" pvc
> standoff on top of the 18 x 4 corrugated toroid and watching the
> arc leap from the bottom to the top toroid and go around in a circle
> before it streams off the bottom toroid. 
> When I use the 14 x 4 on the bottom and a small toroid made out
> of 4 - 90 degree hard aluminum joints, on top, streamers come
> out the top and the bottom. 
> I have discovered from experimenting with the different topload
> sizes and standoffs I can do field shaping by keeping the streamers
> from striking downwards and hitting the strike rail. Just by placing
> your 14 x 4 on a small standoff in the middle of the 20 x 6 will
> attract the streamers upwards. They don't emit from the smaller
> toroid, they'll arc to it occasionally, but they streamers go out
> from the sides evenly. If I don't use your 14 x 4 in the middle
> and just use the larger 20 x 6 by itself, the streamers will hit
> the strike rail, wham, wham, pop!