Re: GM coil record (was Solid State Record )

To: tesla-at-pupman-dot-com
Subject: Re: GM coil record (was Solid State Record )
From: "Jim Lux" <jimlux-at-jpl.nasa.gov> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Sat, 22 Apr 2000 11:16:36 -0600
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

> >
> >Rules of engagement are important...   Is that the SGMHEICSLR? (SINGLE
> >GM....) or are you claiming a record for any number of HEI coils.
> 
> I just used one.  If you could phase them I suppose you could run them
out
> of phase for 26 inch arcs???  but I only used on single coil to get the
> 13.25 inches.

> 
> >
> >I am too lazy to look in the archives, but was that almost 14" spark
with a
> >cored or de-cored HEI coil?  I know you were driving it at somewhat
above
> >its design primary voltage (heh,heh)...
> 
> Decored and operating as a true single shot coil.  Stay about a shot
every
> 5 seconds to keep the stress on the coil down.  When you get to about
1500
> volts on the primary cap, the coil will cook.  Be sure to use a new coil
to
> get the best chance of it living through output pulses at 10X the design
> voltage ;-))

OTOH, if I run at a mere 600-800 volts, it should last forever... or run it
at 400 volts and at 1 kHz rep rate, which is what I think I am going to do.


> 
> >
> >based on some numbers that Bob Wroblewski sent me, at 12Volts, the
limiting
> >current will be about 3.2 Amps (DC resistance is 3.7 ohms by working
from Q
> >measurement).  With the 3.6 mH inductance, this is a stored energy of a
> >feeble 10-20 mJoule, which seems low ( I'd expect 50-100 mJ, stock).  As
I
> >recall, you were pumping a joule or so?
> 
> 1.7uF 1500volts primary.  About 2 joules at 10kHz.  Don't touch it!!!!
> 
> I think I have a MicroSim model and more data around but I will have to
dig
> it  up....
>