Re: new coil/rotary spark gap

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Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>



At 4 inch dia a flat pri is all you need.  keep sec coilform 1.5 
inches away and lowest turn of sec approx 2 inches above the flat 
plane of the primary coil.

Correct sec winding length for a 4 inch dia coil using 5:1 aspect 
ratio would be 20 inches long.  You don't need 48 inches --- too long.

Dr. Resonance


> Hello all,
> After a long time i have decided to build another coil, it has a 4 
> inch by 4 foot secondary and the primary isnt made yet. I have stuck 
> with static spark gaps but i want more power and have decided to go 
> with a rotary spark gap. I have tried 3 times but i dont have the 
> materials needed for a good quality set up. Does anyone have one 
> laying around they would be interested in selling, or making me one? 
> Also would a flat primary be better or would a cone shaped one. I am 
> farely new and only built a few coils so any help is greatly 
> appreciated, thanks Andrew