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Re: smooth sphere vs unsmooth sphere (fwd)



---------- Forwarded message ----------
Date: Thu, 26 Mar 1998 18:13:30 PST
From: Mad Coiler <tesla_coiler-at-hotmail-dot-com>
To: tesla-at-pupman-dot-com
Subject: Re: smooth sphere vs unsmooth sphere


Sulaiman,
In your equation, R = radius in meters. What are you taking the radius 
of? If R = spark length than I think the voltage works out to be a 
little higher than what I have generally believed it to be.

Tristan

>----------
>From:  Sulaiman Abdullah [SMTP:sulabd-at-hotmail-dot-com]
>Sent:  Thursday, March 26, 1998 10:25 AM
>To:  tesla-at-pupman-dot-com
>Subject:  Re: smooth sphere vs unsmooth sphere
>
>Tristan,
>You can estimate the voltage produced by your coil now.
>VOLTAGE = 2.83 MV x R         (R = radius in meters)
>I just worked this formula out today based on a commonly accepted value 
>of 25 micro-coulombs per square meter being the limit before breakout.
>
>>From:  Mad Coiler [SMTP:tesla_coiler-at-hotmail-dot-com]
>>Sent:  Wednesday, March 25, 1998 6:15 PM
>>To:  tesla-at-pupman-dot-com
>>Subject:  smooth sphere vs unsmooth sphere
>>
>>To all coilers,
>>
>>For the last few months I have been running my small 3" classic coil 
>>with two metal salad bowls for the HV terminal. The salad bowls were 
>>placed on top of each other as to make a sphere. This setup costs 
about 
>>$2 and works great. For a long time I kept hearing how a smooth 
topload 
>>will outperform one that has edges. So I borrowed a sphere from one of 
>>those Van de Graph (I hope I didnt misspell that too bad) generators 
>>that were just sitting in the phsysics lab without any insides in 
them. 
>>The two different spheres were approximately the same radius. First 
>>results: after tunning at lower power levels I turned the power up. It 
>>seems the curvature wasnt enough for breakout on the smooth sphere and 
>>instead arced from near the base of my sec coil to my pri coil. I then 
>>placed a bump on the surface of the sphere by taking a small nut and 
>>taping it to the surface with aluminum tape. I went over this a few 
>>times with some more aluminum tape so it has no sharp edges and is 
>>fairly smooth, protruding about 1/2 inch. I then ran the coil slowly 
up 
>>to full power and it arced out from the bump and actualy rised off the 
>>bump and traveled slightly up the side. Befor (with the salad bowls) 
>>there was an edge all around the sphere and the arc would come out all 
>>sides at once. Now most of the power is in one big branching arc. Arc 
>>length increased from about 18" to 24". The pictures of mine on Chip's 
>>site (www.pupman-dot-com) is of the salad bowl topload and the edge is 
>>clearly visible with the arcs comming out all aoround. I probobly wont 
>>have any better pictures for some time. And the performance increase 
>>might even be more than is stated above because the primary tap is at 
>my 
>>last turn and might need more turns.
>>
>>Tristan Stewart
>>
>>
>>
>>
>
>
>
>


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