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

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

Original poster: Dave Leddon <dave-at-leddon-dot-com> 

I shot this picture Sunday.
http://nick_tesla.home-dot-comcast-dot-net/Segmented_Gap.jpg
I generally use a segmented gap as a tuning aid and in this shot, where the 
coil is about maxed out with 10.4 kva input to the pig,  the last terminal 
in the gap is exactly 14 feet from the toroid.    With a 46 inch secondary 
this gives a ratio of 3.65 which is close to Richard Hulls, "Nemesis" which 
is particularly gratifying since I tried to follow his design philosophy in 
the construction of this coil.  Well, almost.  I did end up with an aspect 
ratio of 3.8 which is somewhat more than his recommended maximum ratio of 3.

Dave


At 11:27 AM 1/23/04 -0700, you wrote:
>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)