John Freu came up with the formula based on his experiments if memory
serves. He said that 0.5 SQRT watts gave many smaller but full looking
streamers, and 0.9 SQRT watts gave a single huge streamer. Going larger
than that required a breakout point. I'm hoping he will chime in so I
don't accidentally twist his words. In any event I've found it to hold
true for all of my coils also, but I've only built three distinct coils so
far (many revisions, but only three ground up systems)... It also sort of
matches Peter Terren's 6-in coil, which I always considered to be a great
medium system. The better looking ones in my opinion always did have tiny
looking secondaries and huge top-loads, they just look more powerful that
way. In my opinion, to each his own...
Scott Bogard.
On Tue, Jul 29, 2014 at 7:44 PM, mddeming--- via Tesla <tesla@xxxxxxxxxx>
wrote:
>
> Hi All,
>
>
> If anyone has any multi-example empirical evidence, or scientific theory
> to support either side of this allegation, I have not seen it in the last
> 60 years.
>
>
> Matt D
>
>
> "Opinions are like ******** well, everyone has one" Anon.
>
>
>
> -----Original Message-----
> From: Scott Bogard <sdbogard@xxxxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Sent: Tue, Jul 29, 2014 7:32 pm
> Subject: Re: [TCML] Choosing the right toroid
>
>
> I have to respectfully disagree to the sentiment of sizing a toroid to the
> size of the secondary. A secondary coil is usually sized arbitrarily by
> most builders, and as such sizing the top load to it results in an
> arbitrary size. Instead I think it is better to size according to input
> power, which is sort of the ultimate "given" variable in a Tesla coil
> system. The exception to this would be if you actually sized your
> secondary dimensions to give spark length = secondary length * 2.5 (or some
> other number) which in my systems results in a rather huge looking top
> load, or several smaller ones. In my opinion most coils on the internet
> have WAY too small a top load, or way too big a secondary, (the problem
> with the latter being unnecessary increased cost of materials). In the end
> it doesn't really matter though I suppose, you can always keep adding or
> adjusting top loads until you get the optimum C, the little tweaks are half
> the fun of building!
>
> Scott Bogard.
>
> On Tue, Jul 29, 2014 at 10:43 AM, Brandon Garretson <
> garretsontech@xxxxxxxxx
> > wrote:
>
> > "size your toroid to about the same dimensions as your secondary coil
> form"
> >
> > Im totally with David on this one, if you like to keep your life simple
> > anyway.
> > If you find you can use a little more capacitance you can do like I did
> and
> > add a smaller toroid directly under your large one. I have a 4"x~24"
> > secondary. I added a 3x10 spun toroid under my 4x24 home-made and it let
> me
> > tune out the primary a little further, get somewhat longer sparks and
> > completely eliminated strikes to the primary.
> > Its much easier to add capacitance than it is to subtract.
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> >
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>
>
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