Re: toroid size

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <FutureT-at-aol-dot-com>

Greg,

I forget how tall your coil is, but if it's not tall enough this
may promote breakdown at high powers with the large toroid.  
At 100 bps, this will even get worse if the bang size increases. 

John


>
> Hello all,
>
> Does a 12"x46" Al duct toroid seem too large for a 8-10kW 12" 
> diameter coil running at 200BPS? That is what I am currently using, 
> and the coil will not break out without a sharp point. If I remove 
> the sharp point, the secondary gets severe racing arcs, so hot that 
> the coil immediately is ruined and needs repairing (no sparks break 
> out of the toroid). The coil makes over 10 foot sparks with the 
> breakout point, and I would have thought it would have no trouble 
> with a toroid this big, even without the breakout point. Ideas, 
> suggestions? I'm thinking of switching to 100BPS operation, but I'm 
> scared I'll fry another coil.
>
> Cheers,
>
> Greg.
>
>