Do these numbers look right?

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

Original poster: JOSEPH CACCIATORE <jocatch-at-us.ibm-dot-com> 


Hello again. I am well on my way to designing my first TC after giving up 
trying to restore my old PE magazine coil from 1964. I checked and there 
are a slew of programs and spreadsheets written to help design a TC. 
Unfortunately some give different results for the same input conditions.

The program I found to be extremely helpful is an Excel spreadsheet called 
the Tesla Coil Designer 3.0 by Ed Sonderman and Corey Ruch. It is great 
because you can adjust the secondary/primary parameters and watch for when 
they come in sync.

But never trusting any program fully (i.e., Tax Deluxe say I had an extra 
$1800 coming back on my tax return, it was wrong!), I was hoping someone 
could verify and look at these numbers to see if the coil really will 
perform before I spend all this time, effort and money.

If anyone is willing, here are the specs I came up with:

NST = 12,000v, 30ma, 60hz
Secondary = #22 wire, 20" long, 4" diameter, 765 turns-at-97%
Primary = flat spiral, I.D. = 6", 15 turns, .25" pipe, .25" spacing, 
width=7.25"
Capacitor = .007uf
Toroid = Dmin= 4", Dmaj= 24"

The spreadsheet says secondary res F = 257kh, primary res F = 221khz.

My concern is if I use any larger cap, I can't get the prim/sec parameters 
to match good enough. Also, I don't have any material for a toroid here 
that I can look at so I assume 4" almunin flex hose but I don't know if 24" 
is realistic. Lastly, the primary requires 53' of copper tubing. I am not 
sure where to buy such a long length. I have seen only 25' at Home Depot.

Thanks.
  JC