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Re: dual MOT Tesla coil design is complete (fwd)

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi DC,
What is this 1kw per foot of spark for classical coils??? It has always been a sqrt(power) and not a linear relationship, has it not?
BTW, my 2KW (real wall power) classical coil generates over 7 foot arcs. So this would make it 285 watts per foot by this reasoning, yes??? 

Gerry R.



Original poster: "resonance" <resonance@xxxxxxxxxxxx>
with IGBTs the rules are changing. Their much higher switching efficiency and lower losses of heat and light lead to 450 Watts / ft of spark performance as opposed to 1 kW / ft required in classic coils. 


Dr. Resonance
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, November 01, 2006 5:59 PM
Subject: Re: dual MOT Tesla coil design is complete (fwd)



Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Terry,
This would be great, but what ever happened to the sqrt(power) relationship??? 

Gerry R


Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

At 10:48 PM 10/30/2006, you wrote:

Hi DC,
From what you say below, it sounds like you have the design but have not built it yet?? If this is true, where did the 7.5 foot arcs come from?? 

Gerry R.
My SISG does about 28 inch arcs at 4800 SISG firing volts with a 165nF primary cap. It would do about 42 inches if I let it loose with one MOT... If DC can get 4800 Watts out of two MOTs, then the spark length directly doubles to 84 inches or 7 feet. But he is using a bit larger primary cap too... So 7.54 feet is about right. I am a little concerned about getting 4800 Watts out of just two MOTs. But DC might know tricks I have never dreamed of ;-))
I have not thought much about the dual MOT SISG system... But others are now thinking far faster than me on SISG things ;-))))) 

Cheers,

        Terry