[Prev][Next][Index][Thread]
smooth sphere vs unsmooth sphere
----------
From: Mad Coiler [SMTP:tesla_coiler-at-hotmail-dot-com]
Sent: Thursday, March 26, 1998 8:14 PM
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
>>
>>
>>
>>
>
>
>
>
______________________________________________________
Get Your Private, Free Email at http://www.hotmail-dot-com