RE: Toroid Capacitance

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

Original poster: "John H. Couture by way of Terry Fritz <teslalist-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>


Terry -

I ran some coils thru the E-Tesla6 program with the following results.


  Item         Kurt S.     Bert H.     Bart 8.5      Terry

E-Tesla cap   84.95       48.12        40.74        32.23

E-Tesla Fres  73.64       84.65         71.59      101.76

Test Fres     69.59       90.1          68.90      111.82

Cself         30.53       15.74         15.91       15.69

Tor Reduct    54.46       32.38         24.85       16.54

Tor Free S.   67.00       35.00         33.00       20.00

Tor reduct   18.72%       7.48%        24.75%       17.30%

The program is very sensitive to the actual physical dimensions of the
toroid. The last line is the Toroid capacitance reduction percentage. Would
the smaller percentage reduction coils give a longer spark length because of
the higher voltages?

John Couture

-----------------------------------




-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Saturday, July 19, 2003 6:18 PM
To: tesla-at-pupman-dot-com
Subject: Re: Toroid Capacitance


Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>

Hi John,

The capacitances of toroids, coils, and their combination is well known and
understood.

If one takes say a 20pF (free space) toroid and adds it to a coil with a
Medhurst capacitance of say 15pF, The combination will (in fact must) have
significantly less capacitance.  Maybe like 27pF.

All these can be calculated with E-Tesla6:

http://hot-streamer-dot-com/TeslaCoils/Programs/Programs.htm

Cheers,

          Terry

At 05:52 PM 7/19/2003 -0400, you wrote:

 >All -
 >
 >Have any coilers found that the Toroid free space capacitance is reduced
 >when the toroid is placed on the secondary coil?
 >
 >John Couture
 >
 >-----------------------------------