Re: Highest secondary to spark length ratio?

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Original poster: "Peter Terren" <pterren1-at-iinet-dot-net.au> 

Hi Dan
Richard Hull's classic TC had a spark to sec. ratio of 3.5. This is from a
quote on his site:
http://www.richmond.infi-dot-net/~rhull/highenergy003.htm
"Among the finest of our systems was "Nemesis", a 14" diameter, 48 inch tall
classic coil which regularly
produced 14 foot long arcs when operated near its maximum of 9kva input
energy. Another superb Tesla
coil system was Magnifier #11E which utilized a small 12 inch long, 3 inch
diameter resonator that produced
an astounding 10 feet of output arc with only 5-6kva input energy."

Don't forget the Magnifier also is driven by the secondary as well and is
not really equivalent.  I don't have the secondary details for Richard Hulls
coil but even if his secondary was only 2 feet then the total coil length is
3 feet for a ratio of 3.3 which is not as impressive.

Bert Poole's magnifier has a 33" secondary and 24" resonator (total 57") and
15 foot sparks.  For what it is worth that ratio is 3.1.
http://bhs.broo.k12.wv.us/homepage/chip/current/bpool/bpool2.html

So far the best results I know of are from Ed at 3.77. Now about those
pictures..

CheersPeter (Tesla Downunder)
http://members.iinet-dot-net.au/~pterren

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, January 21, 2004 10:53 PM
Subject: RE: Highest secondary to spark length ratio?


 > Original poster: "Mccauley, Daniel H" <daniel.h.mccauley-at-lmco-dot-com>

 > I believe Richard Hull has you all beat.  Not a tesla coil in the
 > classic sense, but a magnifier.  One of his
 > later magnifier designs has something like a 12" to 15" height resonator
 > coil putting out arcs at about 10 feet.
 > That more than a 8:1 ratio.  Most of his magnifier designs (especially
 > the later ones) were putting out more than
 > 5:1 spark to height ratios.
 > Dan
 >
 >  >I am interested in the longest sparks (hey - aren't we all) in
 >  >comparison to the secondary winding length with a classic TC. Mine does
 >  >96 inches for a secondary of 32 inches ie ratio of 3 times. I have
 >  >heard of ratios up to 5 times but have not seen any documentation of
 >  >this. Has anyone got pictures of coils pushed to higher ratios that
 >  >show the distances clearly? (I need a new desktop background).
 >  >Cheers
 >  >Peter (Tesla Downunder)
 >
 > Peter,
 > My 6" coil, quite similar to yours, does 104" sparks with a 27.6"
 > winding length for a ratio of 3.77.
 > Ed Sonderman