Re: Highest secondary to spark length ratio? (the best ones)

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net> 

Hi,

I have a 3.5x18 inch coil with a 3x11 inch toroid powered with a 12KV x30ma
NST.  I was getting 22 inch streamers with occasional strikes to the primary
(measured 18 inches from the toroid).  I went to a 4x15 inch toroid and
increased the streamer to 27 inches (as the crow flys) estimated 30 inches
(as the streamer flys) and no sec to pri strikes.

Gerry R

 > Original poster: "Peter Terren" <pterren1-at-iinet-dot-net.au>
 >
 > Robin Copini's coil is 110cm giving 498cm at 20KVA ratio 4.5.  Seems to be
 > the best so far but I have asked Robin to check this as by his height of
177
 > (= 5' 10") his coil looks to be about 128cm ie ratio 3.9. Best photo shows
 > 5.3:9.5 ratio 1.79 but angle to vertical spark is not ideal.
 > http://www.geocities-dot-com/rcopini
 >
 > Dr Resonance 10.5ft coil giving 24ft sparks and ratio 2.28.  Best photo
 > 4.0:8.0 ratio 2.0
 >
http://www.resonanceresearch-dot-com/museum-products-electrical-optics-demonstra
 > tions.htm
 >
 > Ed Sondermans coil is 27.6" giving 104" sparks ratio 3.77.  Best photo
 > 3.1:7.0 ratio 2.25
 > http://members.aol-dot-com/esondrmn/index.html
 >
 > Richard Hull's "Nemesis", a 48" giving 14 foot (=168") with ratio of 3.5.
 > Best photo 2.8:6.0 but ends of spark not shown. Ratio 2.14
 > http://www.richmond.infi-dot-net/~rhull/highenergy003.htm
 >
 > My 32 " and 96" giving ratio 3.0. Best photo 4.0:12.0. Ratio 3.0
 > http://members.iinet-dot-net.au/~pterren/Tesla_8ft.JPG
 >
 > My point is that there are some magnificent coils out there with great
 > performance but have photos that do not do the maximum spark length
justice.
 > ie that show sparks greater than 3.0 times coil length measured off the
 > photo.  This I believe gives a lot of the "WOW" factor.  I am still
looking
 > for a TC photo of any size coil that beats that ratio. Please help!
 >
 > Cheers
 > Peter (Tesla Downunder)
 > http://members.iinet-dot-net.au/~pterren
 >
 >  >  >  >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)
 >
 >