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Two Toroid Test
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From: Esondrmn-at-aol-dot-com [SMTP:Esondrmn-at-aol-dot-com]
Sent: Monday, June 22, 1998 12:19 AM
To: tesla-at-pupman-dot-com
Subject: Two Toroid Test
Well, we put some major run time on the coil tonight. Finally, a night with
no thunderstorms. The goal here was to try the two toroid test in an attempt
to cause the discharges to go up and away from the primary. Based on testing
that I had done with my small 3.0" coil, I learned it worked best with the
large toroid on the bottom and the smaller toroid on top - not what I had
guessed. So I set it up with the 40" toroid mounted on the secondary, then a
14" tall x 20" dia. cylinder made from aluminum flashing, then the 33" toroid
on top of that. Sure enough, all the sparks came off the lower toroid and
went straight down to the strike rail, primary coil and the cement. So much
for the earlier testing.
I had plenty of power to break out both toroids with sparks starting about one
half power. The best tune was at turn 9.5 on the primary which is exactly
what I had calculated - based on the 75% figure of adding the two toroid
capacitances together and multiplying by .75 as in the article in the recent
TCBA News. Then I reversed the two toroids with the larger toroid on top now.
It works great. Virtually all the sparks leave from the upper toroid and go
out and up. I had no hits to the strike rail with this set up.
I achieved a new record for this coil with discharges of 92" to a grounded
wire. Not bad, about 3.5 times the winding length of the secondary. It was a
great time. I shot two rolls of film and maybe we can get some posted when I
get them back.
The best performance was with two of the new 1.6 ohm 1000 watt resistors in
series for 3.2 ohms and in series with the inductive ballast variac. I
noticed after many minutes of run time, the new resistors were smoking like a
bar b que. Let me see, 40 amps through 1.6 ohms should be about 2,500 watts -
I guess they should smoke a little.
Big sparks in Spokane, Ed Sonderman