Re: Large Plasma Globe Calculations

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Drake Schutt" <drake89@xxxxxxxxx>

would a 9/60 coil really power i 125 dia sphere nobel gas filled 
globe?  wow i wouldve thought it would take more to ionize all of that gas....

On 4/30/07, Tesla list <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx> wrote:
Original poster: "resonance" < 
<mailto:resonance@xxxxxxxxxxxx>resonance@xxxxxxxxxxxx>




You need an oven large enough to bake out the globe --- to remove all
the residuals.  We also blast ours with argon at 50 kV for 2 hrs to
do the final removal after baking.

The oven large enough to bake a 125 ft dia sphere should only cost a
million $$$ or so.  Our oven for up to 40 inch dia. globes, used,
cost us $9,500.00, and we got a "good deal" on it.

Dr. Resonance




>Hi everyone, just wondering if these calculations I made seem to be
>close to correct? I remember hearing someone say that a 6" plasma
>globe would probably send 4mm streamers in the air instead of the
>gas filled sphere. So if that is not correct then these calculations
>would be way off.
>
>
>
>Standard Six Inch Plasma Globe
>& Spark Gap Tesla Coil;
>
>Compare Chart
>
>************************
>S_IG = Spark In Gas
>S_IA = Spark In Air
>************************
>
>------------------------
>Six Inch Plasma Globe;
>
>( 76.20mm ) 3.00in S_IG
>
>( 04.00mm ) 0.16in S_IA
>------------------------
>
>************************
>76/4 = 19 (?)
>711.2 x 19 = 13,512.80
>************************
>
>------------------------
>Medium/Small 9/30 SG Coil;
>
>( 13512.80mm ) 532.00in 44.30ft S_IG
>
>( 711.20mm ) 28.00in 2.30ft S_IA
>
>Sphere Diameter 88.60ft
>------------------------
>
>------------------------
>Medium Sized 9/60 SG Coil;
>
>( 19304.00mm ) 760.00in 63.30ft S_IG
>
>( 1016.00mm ) 40.00in 3.30ft S_IA
>
>Sphere Diameter 126.60ft
>------------------------
>
>------------------------
>Medium/Large 15/60 SG Coil;
>
>( 26790.00mm ) 1055.00in 87.90ft S_IG
>
>( 1410.00mm ) 51.50in 4.60ft S_IA
>
>Sphere Diameter 175.80ft
>-------------------------
>
>If the calculations are correct, that would be one amazingly huge
>Plasma Globe to see. Would it even be possible to build one that
>large? I was thinking and the coil would need to be elevated to the
>exact center of the sphere to work correctly. I would think the
>primary would need to be heavily insulated if the coil was in the
>sphere. Something special for the spark gap would have to be thought
>up, or just use a VTTC, maybe. Of course a Glass sphere that large
>would cost thousands of dollars to make though, if not more. I doubt
>this is something any of us on the list could build.
>
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