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Re: Top Toroid



Tesla List wrote:
> 
> >> Subject: Re: Top Toroid
> >> >Subject: Re: Top Toroid
> >Subject: Re: Top Toroid
> >> Subject: Re: Top Toroid
> 
> Subscriber: rhull-at-richmond.infi-dot-net Sun Feb  2 17:40:20 1997
> Date: Sun, 2 Feb 1997 09:23:48 -0500 (EST)
> From: richard hull <rhull-at-richmond.infi-dot-net>
> To: tesla-at-pupman-dot-com
> Subject: Re: Top Toroid
> 
> At 10:10 PM 2/1/97 -0700, you wrote:
> >> Subject: Re: Top Toroid
> >> >Subject: Re: Top Toroid
> >
> >Subscriber: bert.hickman-at-aquila-dot-com Sat Feb  1 21:51:19 1997
> >Date: Sat, 01 Feb 1997 09:19:36 -0800
> >From: Bert Hickman <bert.hickman-at-aquila-dot-com>
> >To: tesla-at-pupman-dot-com
> >Subject: Re: Top Toroid
> >
> >Tesla List wrote:
> >>
> >> Subscriber: jim.fosse-at-bdt-dot-com Fri Jan 31 23:11:00 1997
> >> Date: Sat, 01 Feb 1997 03:21:50 GMT
> >> From: Jim Fosse <jim.fosse-at-bdt-dot-com>
> >> To: tesla-at-pupman-dot-com
> >> Subject: Re: Top Toroid
> >super snipperoo
> 
> >Jim,
> >
> >Use a toroid diameter of at least 2/3 to 1X the diameter of your coil.
> >An 8" coil, driven fairly agressively, should support a 6" ROC toroid.
> >If you err on the large side, you can still always force it to break out
> >by using one or more small foil duct-tape "bumps" to disrupt the e-field
> >and instigate corona (where you want it - :^)). It sounds like your
> >system is prematurely breaking out and could use a bigger ROC toroid.
> >
> >If you can get to the point where the toroid just starts breaking out
> >after 1-3 seconds of operation (i.e., after you've built up a local ion
> >cloud around the toroid), you've hit the right size! Unfortunately, I
> >find that day-day variations in humidity may cause better/worse
> >performance when you're right at the egde.
> >
> >Safe coilin' to you, Jim!
> >
> >-- Bert H. --
> >
> >
> >Bert, Jim,
> 
> I usually shoot for 2X the coils length as a toroidal diameter!!  Obviously,
> in Jim's case he is grossly underpowered for such an item.
> 
> The reason to select so large a top load with regard to the resonator is
> Tesla's own suggestion that the system might be better designed from the
> resonator backwards!  He made this statement in the CSN.
> 
> The resonator is the darling of the Tesla coil engine, and being the mover
> and shaker, it should be looked at from the standpoint of "how much do I
> want out?" and then choose a suitable top hat.  From this point, figure
> backwards to arrive at all the rest of the system parameters, including
> required energy input to breakout of the monster you have created.  I never
> start with the transformer and work towards the toroid as last
> consideration.  It is a first thought item!
> 
> In Jim's case, he has a transformer and that is his limiting factor.  He can
> never get what he desires from his system beyond what the little neon
> transformer can supply.  So I would imagine a 12" X 5" toroid might be
> sufficient maybe a little larger.
> 
> Richard Hull, TCBOR

Richard and Jim,

I should have been a little bit clearer - I was refering to the ROC
(smaller diameter) as a function of coil diameter in Jim's case, not the
outer diameter. I agree that the outer (large diameter) can be
significantly greater for better coil performance, although I only have
direct experience with a toroid diameter (32") slightly larger than my
coil length (31"). The ROC is 8". However, it takes two 15 KV 60 MA
transformers to adequately drive this toroid to breakout. 

Safe coilin' to you!

-- Bert H --