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Re: new to tesla coils

In a message dated 2/5/99 5:28:31 AM Pacific Standard Time, tesla-at-pupman-dot-com
writes:

> 
>  Hello all, 
>    
>  You wrote:
>   Original Poster: "Ross W. Overstreet"
>  <<mailto:ross-o-at-mindspring-dot-com>ross-o-at-mindspring-dot-com> 
>   Now go download the Sonderman / Ruch spreadsheet that will help you out
>   with the Tesla Calculations.   While you are there, link over to the Tesla
>  Coil
>   Archives and read a bunch of that stuff.  URL  is below.
>  
>
<http://members.tripod-dot-com/~coreyonline/CoreysTC.html>http://members.tripod.
>  com/~coreyonline/CoreysTC.html
>   
>  Uhm, be careful of this spreadsheet. It has a few errors in the Medhurst
>  look-up-table. I did a few test on different H/D values. The error starts
>  to get large for H/D ratios above 5.5.
>    
>  (H/D=1) 0.461  (correct)
>  (H/D=1.2) 0.464; should be  0.459xx
>  (H/D=2.4) 0.548; should be 0.543xx
>  (H/D=5) 0.810; should be 0.807 (close)
>  (H/D=6) 0.920; should be  0.891
>  (H/D=8) 1.12; should be 1.336xx
>    
>  I did not test all the table values, but only the few mentioned above, so
>  there might be more errors. I don&acute;t know who it was that made the
>  error (Ed or Corey), in this spreadsheet.
>    
>  I also DO NOT want to step on anyone&acute;s feet. I just thought I should
>  mention the error.
>    
>  Coiler greets from germany,
>  Reinhard
>  
Well, the story goes like this:  I originally developed the Excel spreadsheet 
for my own use.  Then I sent a copy to someone on the list.  Then someone 
else asked for a copy.  Then I asked Chip to post it on his site, then I think
Bart asked if he could post it on his site.  Then Mr. Ruch made a different
version of it.  To make a long story short, it was originaly intended for my 
own use and the accuracy was good enough for what I was doing.  The lookup 
table that I used was posted on this list on 11-1-96.  I know who sent it to 
me and he commented at the time that he did not have his references handy
to tell me where the numbers came from.  The original table listed H/D ratios
from 1.0 to 5.0 in .5 increments (9 values total).  The rest of the numbers on
my table were calculated by extrapolation.  If someone wants to fix these 
tables and take over the ownership/maintenance of this spreadsheet they 
are welcome to do so.

And Reinhard, thanks for the tip - no offense taken.

Ed Sonderman