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Re: [TCML] HIGH Q number crunching WIP update



The issue of KV output is a comparison between 2 types of coils, that was the baseline figures used to setup both coils. How it will work out to actual spark lengths is another matter where only build it and see will really answer that one.
I know all about the capacitance and toroid problems, already documents 
pages of data upon all that already posted to the list some time ago. Its a 
whole epic in itself unfortunately.
MadK I think had a Q of 2000 , JAVATC was 1000 or so I think,  I don't know 
how to "measure Q", Though I know the coil gain is at least 1,000. based on 
1V input and somewhere around 1,000 to 2,000V output. Which really does not 
make much sense but that's the whole idea of trying something new.
coil Q does not matter too much in classic coils as so many other factors 
swamp and Q factor tests. Like one cannot just decide to place a high Q coil 
as a direct swap for a low Q coil and expect it to work, I think in general 
it is known that high Q coils probably work worse, but you have to re-design 
the entire setup from bottom up to make use of high Q coils.  Probably 
sticking my neck out on the line, but its what has been concluded over the 
past year or so of number crunching and design testing.
When I tested coil gain on 1V, that wasn't even a in tune system, single 
shot pulse testing, at resonance the figures should be a lot higher. Its 
also on the basis that 100V input will give at least 1,000 times that ( 
1000x100 =  100,000V) So worst case isn't to bad, it will output "something" 
which is all I am really interested in at the moment.
Cheers,
Chris



----- Original Message ----- From: "Lau, Gary" <Gary.Lau@xxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Monday, April 14, 2008 5:25 PM
Subject: RE: [TCML] HIGH Q number crunching WIP update


It might be prudent to think about just what coil parameter really correlates with "performance". You suggest that the output KV would indicate relative performance.
I would point out that an easy way to boost the peak secondary voltage is to 
minimize secondary capacitance.  By conservation of energy, the same input 
bang translated to a smaller topload capacitance would yield a 
correspondingly higher voltage.  But the experience of anyone who has 
experimented with different topload sizes is that larger toploads almost 
always result in longer sparks.  Granted, the resulting topload voltage is 
no doubt lower with the bigger toploads, but it points out that what 
constitutes "performance" may not be topload voltage.
It's also not clear to me that secondary Q is terribly important to 
performance, by any measure, in a disruptive coil.  For CW coils, it does 
matter though.
I'm not familiar with how JavaTC arrives at things.  Did JavaTC give 
expected Q's of your competing coils?  Have calculated values been validated 
with actual measurements?
Gray Lau
MA, USA



-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf Of Chris Swinson
Sent: Monday, April 14, 2008 10:31 AM
To: Tesla Coil Mailing List
Subject: [TCML] HIGH Q number crunching WIP update


Hi all,

2 PDF files, the first one shows the demo coil in JAVATC but reduced to 0.6J
( running on 8KV )

The second pdf shows my current construction for my high Q system. OK I
missed out a fair few bits, but according to the results the high Q 80turn
coil can easily do just as well as the 895 turn demo coil.

For those who want to skip to the point, both designs appear to output the
same KV ( well they do math wise). Though I hope my high Q design will
actually perform a lot better than a conventional coil... easier said than
done, but every step of the way is a calculation nightmare, but getting
there!!

http://www.future-technologies.co.uk/temp/javatc.pdf

http://www.future-technologies.co.uk/temp/javatcQ.pdf

http://www.future-technologies.co.uk/IMPULSE/20kvq/ ( a little more info )

There are 2 designs using the same secondary, one is a high Q LV design
(100V solid state design) and the listed 20KV design. There is actually a
lot of work and data to crunch and of course is taking its time to build :-(
Currently building a 20KV pulse cap out of tin foil and food tubs, been 10
years since I built one, the good old days ;-)

I might also add apologies for the poor pdf print out, and poor WIP hack of
JAVATC too :)

Chris


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