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RE: E-Tesla 6.11 strange prediction
Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
Yeah! When I ran Matt's coil at 400 x 400 it only took 100+ billion
floating point calculations to figure out :-))) Also see the field stress
plot (volts per inch) I did later:
This clearly shows the electrically dead space between the toroids as well
as the high field stress areas where the streamers break out from. So far,
E-Tesla6 has always worked extremely well. There is a small discontinuity
that has about 4% error that was mentioned the other day but I think I know
what that is...
It is gratifying to know it works so well after all the days, and nights,
spent on it. When it was a slow basic program, I set my alarm every two
and a half hours during the night so I could wake up and load a new set of
test data on all the computers in the house... I still am stunned on how
fast the C programming helpers were able to get it to go now!! A full
night's worth of testing can be done in minutes now...
I should point out that Paul's new computer tools exceed E-Tesla by orders
of magnitude! We just have to wait a bit longer before all that high
powered math stuff gets down to the rest of us. 0:o)) Tesla coils used to
be such a big mystery not too long ago, but now they are quickly becoming
some of the most well understood machines around! But still much to do...
At 12:20 PM 5/21/2001 -0700, you wrote:
>This is a great triumph for E-Tesla6. The picture is an excellect
>illustration of the fields. It will be interesting to see what Matt's tests
>show. This much capacitance reduction is most unexpected. But the unexpected
>is the fascination about Tesla coils.
>From: Tesla list [mailto:tesla-at-pupman-dot-com]
>Sent: Sunday, May 20, 2001 3:42 PM
>Subject: RE: E-Tesla 6.11 strange prediction
>Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
>I think the 57.3% is indeed correct. Look at the picture of Matt's coil at:
>The difference between his and most systems is that he has two terminals.
>The terminals are right over and under each other. This vastly reduces
>their individucal free space capacitance's since they are right next to
>each other. The energy stored between the two toroids is about zero so the
>effective capacitance is far less than if they were significantly far
>apart. This is an advantage of E-Tesla6 in that it figures these nasty
>situations out :-))
>Hopefully Matt will be able to fine the true frequency so we can see how
>close the predictions are. I am putting my bets on 287253.72 Hz :-))
>At 01:34 PM 5/20/2001 -0700, you wrote:
>>Terry, Matt, All -
>>I did a check on Matt's coil using E-Tesla6 and found the toroid
>>reduction to be 57.3% compared to the approximate 20% reduction that
>>E-Tesla6 showed for other coils. Is this correct?
>>The basic resonance equation is
>> Fr = 1/(6.283 sqrt(LsCs))
>>For Matt's coil Fr = 287730 hz Ls = 13.76 mh
>>This gives Cs = 22.24 ph Cs = Ctor + Ccoil
>>The Medhurst equation gives Ccoil = 8.14 ph
>>for a 2.1 rad and 21.16 Lgt secondary coil.
>>The coil self capacity (Ccoil) can also be found with the JHCTES program
>>without using calcs.
>>The effective capacitance of the toroids on the secondary coil is
>> Ceff = Cs - Ccoil = 22.24 - 8.14 = 14.1 pf (Ceff)
>>The isotropic (free space) capacitance of the toroids can be found by the
>>equations shown on my web site (Secondary Terminal) or by the Sphere/Toroid
>>graph I show in my books.
>> Toroid #1 3.25 x 11.25 (OA) = 13.00 pf
>> Toroid #2 4.25 x 18.00 (OA) = 20.00 pf
>> Total isotropic capacitance = 33.00 pf (Ctot)
>>The percent of capacitance reduction for the toroids when placed on the the
>>secondary coil is
>> % Reduction = (Ctot - Ceff)100/Ctot
>> = (33.00 - 14.1)100/33.00 = 57.3%
>>This 57.3% reduction is much greater than the approx 20% found by E-Tesla6
>>for other coils.
>>It will be interesting to see what the actual resonant frequency tests
>>There should be two types of res freq tests.
>> Test #1 Low test current in sec coil by feeding the coil at the bottom
>>with a function generator. The res freq is found with a freq counter.
>> Test #2 High current in sec coil by operating TC at high voltage but
>>with only corona output. The res freq is determined using a storage scope
>>and Terry antenna probe. This res freq should be lower then in Test #1.