DRSSTC eye candy (sparks)

["Tesla list" <tesla@xxxxxxxxxx>]

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

Hey guys,

It was in the low 50's (temp) today  so i cleaned up the garage a bit
and brought my DRSSTC out there for a run.  I was happy to see it
pegging 5' and reaching out to 6' whenever it wasnt arcing to
something closer.  You can see the pictures at the BOTTOM of this
page:

http://www.stevehv.4hv.org/DRSSTC1.htm

Just a few notes about this run.  I did blow the 15A fuse twice (the
fuse was all that failed).  I think this might be partially due to my
VERY large filtering capacitors (22000uF each, 200V).  The 7.5A variac
wasnt even warm after a long run, so im a bit skeptical if im really
using 15A rms.  The peak primary current surged to about 700A during
stressful "short" arc conditions (like to the strike rail at about 2
feet).  The longer sparks (most of the connected streamers are at 5'
length or better) did not trip the OCD.  The sparks out to the wall on
the left were measured to 67", and i had a few reach out past 6'
(didnt get any on camera though).  I will have to bring the coil
outside to see what it can really do... i never reached full input
voltage.  I was running the coil at 120bps and about 150uS on period
for about 8.5 cycles.  I found that increasing from 120uS to 150uS
made a considerable improvement.  I even had it cranked up near 180uS
at one point where i was getting 5' sparks at maybe 65% input voltage!
 Pretty much out of room in this garage though, so i will have to wait
till it gets dark and run it out in the back yard and see where this
guy tops off for spark length, my guess is about 80" will be the very
max.

Comments and questions are welcome.

Steve Ward