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RE: RE:Spheres vs Toroids (was - Source for Aluminum Spheres (up to 12" threaded)
Original poster: "John H. Couture" <couturejh-at-mgte-dot-com>
Any TC testing and research performed and the results reported to the List
is a plus for all coilers. I hope you can find your way clear to do this
toroid testing.
John Couture
-----------------------------
-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Friday, October 31, 2003 11:00 PM
To: tesla-at-pupman-dot-com
Subject: Re: RE:Spheres vs Toroids (was - Source for Aluminum Spheres
(up to 12" threaded)
Original poster: "RIAA/MPAA's Worst Nightmare" <mike.marcum-at-zoomtown-dot-com>
This gives me an idea: take my 4.5kva PT coil and try every combo of toroid
within reason (that gives approx. the same tuning, might have to adjust the
primary slightly since same pf toroid will be a bit different when combined
with the coil) and see what the best ratio is for max length/coil
protection. Is this how coils are tuned for power as opposed to max voltage?
I read somewhere about Brent Turners coil (3.5 kVA) only putting out about 6
foot of spark, but it was very thick and bright. At 3.6 kVA mine puts out 9
feet (about once every 1 minunte run hits ground 9 feet away, which is how I
measure length), but the spark brightness is mediocre until it power arcs to
ground.
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, October 30, 2003 7:52 PM
Subject: RE:Spheres vs Toroids (was - Source for Aluminum Spheres (up to 12"
threaded)
> Original poster: "John H. Couture" <couturejh-at-mgte-dot-com>
>
>
> It is generally accepted that a toroid is better than a sphere for a TC
> topload. But how do you determine the optimum toroid size because for a
> certain size sphere diameter there are many different sizes of toroids
that
> have the same capacitance?
>
> For example if yon need a topload of 60 pf a sphere of about 43 inches
> diameter will do the job. The possible toroids with the same 60 pf
> capacitance are as follows.
>
> 3" x 70" toroid
> 4" x 66" "
> 6" x 62" "
> 8" x 60" "
> 12" x 56" "
> 15" x 55" "
> 20" x 52" "
>
> There are many other possibilities. The minor diameter will give a
certain
> breakout voltage and the major diameter will determine the amount of
> protection for the secondary coil. But how would you go about selecting
the
> minor and major diameters?
>
> I show a graph in the Tesla Coil Notebook with curves for spheres and
> toroids. The graph makes it easy to find the toroids that have the same
> capacity of a certain size sphere. However, I have never seen any
> information or graphs that show recommended spheres or toroids for use
with
> a certain size TC to obtain the maximum spark length and also give the
> proper protection for the secondary coil. It is obvious that if the
topload
> is too large the available TC power will not be capable of charging it
> properly.
>
> John Couture
>
> -----------------------------
>
>
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Saturday, October 25, 2003 3:01 PM
> To: tesla-at-pupman-dot-com
> Subject: Re: Source for Aluminum Spheres (up to 12" threaded)
>
>
> Original poster: Ed Phillips <evp-at-pacbell-dot-net>
>
> Tesla list wrote:
> >
> > Original poster: "Mccauley, Daniel H" <daniel.h.mccauley-at-lmco-dot-com>
> >
> > > Has anyone here ever compared large spheres with toroids for
top
> > > loading of high-power TC's?
> > >
> > > Ed
> >
> > Toroids do much better than spheres. I believe the first person to
> > start using toroids was back in the 1970's from
> > what i've read from Richard Hull's historical notes.
> >
> > Dan
>
> In what way better? Clearly they work just fine but wonder what their
> edge is over a sphere with the same breakdown voltage.
>
> Ed
>
>
>