Hi Carlos.
The streamer length increases significantly from 100-200 bps. 200-600
there is only a slight increase, probably ads only 50-70 cm to the
streamer length.
The 2.2kw sparkgap motor can't get the disc to spin over 700 bps.
The 125 amp fuses can only take 700 bps for a short while before they
pop.
The coil jumps to two steady streamers at this power level.
We had primairy to secondairy flash over at 700 bps, so the coil is in
repair now. This led me to believe that the coupling is already too
high.
It's .2 acoording to javatc. Playing around with the coupling is not so
easy with a 250 kilo secondairy and topload. We think about installing
a
carjack or something like that.
The sparkgap quenches at second notch with airstreamers and firstnotch
in
ground strikes.
Highering the coil will probably help some because it easily finds it's
way to the floor. We might ad a smaller topload so we can higher the
main
topload.
It would be intersting to see how arc length would improve if you lift
the coil up a bit off the ground, and increase the BPS rate.
Coupling is also pretty important on big coils...
Have you experimented with increasing the coupling at all?
Carlos
On 2015-01-02 08:13, vam@xxxxxxxxx wrote:
You got my message spot on Carlos.
The coil produces constant streamers about 20- 23 feet, or 6 - 7
meters.
It's very impressive. But i did make a coil with 1 m winding length
before, producing 3 meter sparks at 20 kw.
so i expected around 10 meters with this set up. but 7 seems the max.
Big machines like this are typically less efficient than there
smaller
brothers and sisters.
I have not taken the time to run the numbers on the info you
provided,
but if the system is well balanced and in tune and pulling 40kva, I
would expect to see 20-25 foot long arcs at minimum.
The height of the coil will also be a limiting factor to some
degree...
I assume from your question that you are not happy with the
performance
or it did not meet your expectations?
Kind regards,
carlos
On 2015-01-02 06:03, vam@xxxxxxxxx wrote:
Me and some friends built this coil. It's total height is 5 meters.
the
donut is 2,60 by 60 cm. the coil is 65 cm dia with 1200 turns of
2.5^2mm
installation wire. about 3.6 meter winding length. Cap, DR
resonance
100nF, 80kv 4 in parallel.
We feed it with a 180kva 10kv yz5 transformer. Rectify the lot to
16kv.
ballast ensures 32kv on the cap. at 200 bps we draw 50-60 amps per
fase.
so roughly 40 kw. Max bps is 700.
Now the question. What kind of spark length should be possible from
this
coil?
Picture of the coil.
https://www.facebook.com/photo.php?fbid=671287332969054&set=a.110176789080114.14601.100002633816524&type=1
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