Re: Calculating Capacitance of solid disk

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

Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" <dhmccauley-at-spacecatlighting-dot-com>


I don't think thats correct.  I would expect something on the order of
5-10pF maximum for something this small.

The Captain



 > Computing ..... please wait
 > System or Object Capacitance: 140.08 pF
 > Run CompleteTime elapsed: 2.1 secs
 >
 > To run an objects capacitance, input the dimensions. For your inquiry, my
 > inputs were:
 > disc inside diam. = 0
 > disc outside diam. = 4
 > disc height = 0
 >
 > Then, check the "Disc" checkbox as the system component (only one needed),
 > and press the "Run Capacitance Analysis" button.
 > http://www.classictesla-dot-com/fantc/fantc.html
 >
 > Take care,
 > Bart
 >
 > Tesla list wrote:
 >
 > >Original poster: "Mccauley, Daniel H by way of Terry Fritz
 > ><teslalist-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>
 > >
 > >
 > >Instead of a toroid, I'm going to use an aluminum disk top plate which
I'll
 > >lathe to have nice radius outside edge.
 > >
 > >Anyone know how to calculate the capacitance of a disk like this?  I
would
 > >think it would be approximately close to
 > >the standard toroid capacitance formula.
 > >
 > >I know I could measure it directly using another coil, but I'll be
designing
 > >and winding my secondary before I machine this
 > >disk so I want to get a good approximation of the disk.  The dimensions
will
 > >roughly be about 4" diameter and 0.5" in height.
 > >
 > >Thanks
 > >
 > >The Captain
 > >
 > >
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