Two Toroid Test
From: D.C. Cox [SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent: Tuesday, June 23, 1998 6:32 AM
To: Tesla List
Subject: Re: Two Toroid Test
Sounds like a great coil and you're having fun. We use a small 150 CFM
blower on our series resistor (0.75 Ohm) to keep it from overheating at
higher power levels. Some of the surplus 3450 to 3650 RPM blowers put out
a lot of air in a small area and are reasonably priced.
> 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
> no thunderstorms. The goal here was to try the two toroid test in an
> to cause the discharges to go up and away from the primary. Based on
> that I had done with my small 3.0" coil, I learned it worked best with
> 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,
> 14" tall x 20" dia. cylinder made from aluminum flashing, then the 33"
> on top of that. Sure enough, all the sparks came off the lower toroid
> went straight down to the strike rail, primary coil and the cement. So
> for the earlier testing.
> I had plenty of power to break out both toroids with sparks starting
> half power. The best tune was at turn 9.5 on the primary which is
> 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
> TCBA News. Then I reversed the two toroids with the larger toroid on top
> It works great. Virtually all the sparks leave from the upper toroid and
> 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
> wire. Not bad, about 3.5 times the winding length of the secondary. It
> great time. I shot two rolls of film and maybe we can get some posted
> get them back.
> The best performance was with two of the new 1.6 ohm 1000 watt resistors
> 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
> bar b que. Let me see, 40 amps through 1.6 ohms should be about 2,500
> I guess they should smoke a little.
> Big sparks in Spokane, Ed Sonderman