[TCML] Largest Secondary Coil "Drivable" by Primary Circuit

[Scott Bogard]

John,
	Good info, I was not aware of this relationship, but it does make 
sense.  It does bring to question however, is there a more concrete 
formula that relates input power to relative toroid size or capacitance? 
  So if one is designing a system that uses 3kW his toroid size should 
be X picofarads for longest spark before breakout can no longer occur 
under normal conditions...  It makes me wonder how much bigger I can go 
on my 4-inch coil that uses a 7*24; the thing makes sparks longer than 
my old system that happily ran a 12*40 and is consuming about the same 
power, just a smaller secondary...

Scott Bogard.

On 9/26/2010 8:59 PM, Futuret wrote:
> Brandon,
>
> The toroid size should follow the input power, not the secondary
> size.  If you keep the input power the same, but use a larger secondary,
> you should not use a larger toroid (unless the toroid was too small
> for the power in the first place).  If you increase both the input power and
> the secondary size, then the toroid size should also be increased.
> If you double the input power, then the toroid should be made
> 1.4 times larger approximately.  For example if the original input
> power used a 13" toroid, then when doubling the input power,
> you'd use an 18" toroid... just a rule of thumb.  The spark length
> should also increase about 1.4 times if you double the input power.
> If the original spark length was 40" then the new spark length
> using double the input power might be 56" or so.
>
> John
>
>
>
>
> From: Brandon Hendershot<brandonhendershot at gmail.com>
> To: Tesla Coil Mailing List<tesla at pupman.com>
> Sent: Sun, Sep 26, 2010 7:38 pm
> Subject: Re: [TCML] Largest Secondary Coil "Drivable" by Primary Circuit
>
>
> Hi John,
>
> When I mention spark quality, I mean how long or bright the breakout is.
>
> That's some really nice information there, I may have to save this email! So
>
> if you want the biggest, brightest breakout in town, you shouldn't worry
>
> about secondary and topload size (unless you fear bad quality in secondary
>
> arc length comparison) being as big as possible, and just make sure it isn't
>
> too small. Increasing secondary size will not affect spark length unless the
>
> secondary is too small to begin with (indicated by racing sparks).
>
> And if you're to increase the topload size, it should follow the same
>
> effects as the secondary coil, right?
>
> Thanks John,
>
> Brandon
>
>
>
>
>
>
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