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Re: [TCML] Re: Toroid Size
Hi Greg,
That seems to me like a good match. Regarding a rule of thumb,
it would depend I think on whether you're aiming for absolute max spark
length, or maximum numbers of streamers, or some intermediate
number of streamers for a certain "look". I'm sure you could use
a larger toroid for your secondary (depending on the power level).
For example Gary Lau uses
I think a 7" x 25" toroid for his 6" x 27" secondary and it works
very well, but I think he gets mostly just one streamer since he's
aiming for max spark length and uses about 3000 watts I think.
If you begin with your power input level, and calculate the expected
spark length, that should give an idea of a good toroid size figuring
for spark length = 3.5 times toroid diameter. A 56" spark seems to
work well for a 5" x 16" toroid. For a 4" x 16" toroid you might
get more streamers than for a 5" x 16" toroid. By using the
tall secondary, then it's less important to use a sub-toroid
below the main one, to prevent ground or primary strikes.
I'm sure others will have some good comments too....
Regards,
John
-----Original Message-----
From: Greg Leyh <lod@xxxxxxxxxxx>
To: tesla <tesla@xxxxxxxxxx>
Sent: Tue, Aug 13, 2013 8:35 am
Subject: [TCML] Re: Toroid Size
Hi John,
Is there a good rule-of-thumb for sizing a toroid to a given secondary
dimension? I'm planning on using a 4x16 toroid with a 5x32 secondary
winding. Does that seem like a reasonable match? I'm about to wind the
secondary and thought I'd ask first.
Cheers,
Greg
> Hi Brandon,
>
> Yes, it's definitely possible to have a toroid that's too big. If the toroid
> is too big, sparks will only break out when using a breakout point or
> bump.
>
> The proper size of toroid depends on how many sparks you want to
> see coming off the toroid. If the toroid is large enough to produce
> only one spark streamer... well then you'll get one streamer. If the
> toroid is smaller, then you'll get two streamers, and if smaller yet,
> then you'll get 3 streamers, etc. The smaller the toroid, the more
> streamers, but they'll be shorter.
>
> I happen to like the look when the streamers oscillate from side
> to side of the toroid and occasionally show 2 full streamers. This
> will give pretty long sparks and good spark action. To me this is
> the most exciting type of look. Some folks prefer a full head of
> streamers, etc.
>
> Low break rate coils probably need a little larger toroid to get just
> one streamer.
>
> On my TT-42 TC which gives 42" sparks using a robust 12/30 NST,
> I use a 4" x 13" spun toroid and I get about 3 simultaneous sparks
> I guess. I tested a 6" x 24" toroid on the coil and it gave a single
> streamer but needed a breakout bump to break out reliably.
> Clearly a 6" x 24" toroid was too large in my view. However the
> sparks were a little longer, about 44" or so. I didn't try a 5" x 16"
> toroid, but that would have been interesting to try. Folks often use
> a 5" x 16" spun toroid for a 15/60 NST powered coil. I used to offer
> a 5" x 16" size but it was just too time consuming to make.
> I do offer a 4" x 13" spun toroid ($165, free shipping in USA,
> as-spun finish). Amazing Science ( www.amazing1.com/toroids.htm )
> offers a 4.5" x 18" toroid for about $240 I think plus shipping. I have
> no connection with them.
>
> My website is:
> http://futuret.110mb.com
>
> Cheers,
> John
>
>
> -----Original Message-----
> From: Brandon Hendershot <brandonhendershot@xxxxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Sent: Sun, Feb 19, 2012 5:55 pm
> Subject: [TCML] Toroid Size
>
>
> Hi List,
>
> It's been quite a while since I hung up coiling, looks like the bug's back
> though.
>
> So I finally got myself a job and some stable income (:D) and can finally
> afford to buy a spun aluminum toroid for my coil.
>
> First question; Can you have a toroid that's simply TOO big? I'm suspecting
> that my 4"x16" Al Ducting/Pie Pan do-dad is a bit too small. Would a 6"x24"
> Spun Al toroid be too big of a jump?
> I suppose it would be helpful to plug it into JavaTC, but It's not working
> on my browser right now, and I simply don't want to measure my up whole
> coil again (old PC died).
> Before I go through that errand, does anybody have any wisdom for me
> regarding using bigger toroids?
>
> You can see how my 4"x16" looks here: teslacoilers.blogspot.com
>
> Thanks Everyone,
> Brandon H.
>
>
>
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