Re: Beating Steve's coil >:o))

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Steve Ward <steve.ward@xxxxxxxxx>

Hey Terry,

To be honest, this coil was the first coil that i thought "i will just
make it more like Jimmy's first DRSSTC".  Jimmy's coil might actually
beat mine ;-).  I think he did it right the first time.  Hes getting
90" or more from a 120V line (probably at 20A?).  His coil uses a .6uF
cap.

More comments:

On 6/21/05, Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>
>
> Hi all,
>
> Well, I guess Steve Ward has the "best" DRSSTC...  Grrrrrrrr... :o)))
>
> I was always hoping to use my DRSSTC drive box on my "big coil" for big
> arcs.  My little, easily portable, DRSSTC coil cannot take big arcs...  So
> I ran that past ScanTesla:
>
> http://hot-streamer.com/temp/BigCoil-AsIs-02.gif
>
> Pretty graph, but only 100kV!!!! :-((
>
> http://hot-streamer.com/temp/BigCoil-AsIs-01.gif
>
> Barely a joule of energy to the load!!  And I note that spike looks like a
> middle finger :-p

HAHA!

>
> The streamer energy rise time is "cloudy"...
>
> http://hot-streamer.com/temp/BigCoil-AsIs-03.gif
>
> Bottom line is, my idea of "just driving it" with a DRSSTC box is going to
> be a disaster!!!!!!!

Possibly.  I wouldnt get *too* dependent on scantesla's results.
Remember afterall, the streamer model isnt quite right yet (though its
probably close).  You will just have to experiment with the coil
itself.

>
> I am running 4.6 million models right now to see if I can still use the
> secondary system and primary coil...  The biggest problem is the original
> coil's "tiny" 27.7uF primary cap...

nF...

Yes, that cap really is too small i think ;-).  Those are the IGBTs
you tested to like 700A!  So push them!  If they could really take
700A, and they are 900V IGBTs you could really beat my coil quite
easily with 700VDC on the buss ;-).

Just go for say a 300nF tank cap and see what you can get from the
system then.  Your gonna need some hefty peak currents if you really
want the energy quick.  So stop babying those IGBTs ;-).


  Real bad bang energy and rise
> time...  That coil has a wide and well known coupling range...  The model
> will take several hours...  If I have to go with a new secondary system, it
> might take a month to find the "super" combination!!.... ;-))))  I might
> have to bring the 64bit Sun computer back on-line!!

What are the specs on your secondary now?  It seems that i always get
better performance with lower frequency coils (i have two 6" coils,
one with 26awg and the other with 30awg).  The 26awg coil never did
better than 50" sparks.  The 30 awg coil is what i use now for 80"
sparks.  But, when i ran the 26awg coil i didnt know what i know now,
so this might not really be a valid comparison.

Good luck beating my coil ;-).  Now that i have the KW meter
recalibrated (thanks to Terry's instructions and some helpful ideas
from Jimmy), i will rewire my setup for 120V line voltage and check
out my actual line current and power.  It will be higher than it
"should" be for the bang energy due to the large filter capacitors
(high peak line current), but i can compare this to pspice to verify
the true bang energy.

Steve

>
> Cheers,
>
>         Terry
>
>
>
>
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