Re: 78 inch strike from MOT coil!

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jason Johnson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <hvjjohnson13-at-hotmail-dot-com>


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, June 19, 2001 8:00 PM
Subject: Re: 78 inch strike from MOT coil!


> Original poster: "Gregory Hunter by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <ghunter31014-at-yahoo-dot-com>
>
> Hi Jason,
>
> Great work!  If others can duplicate your results, it
> might be possible to do away with voltage doublers,
> stacked MOTs, and similar awkward schemes. Can you
> provide more details on the coil itself?  What size is
> the tank cap?  How many primary turns, etc?

Here are pretty much all my specs:

Transformer: Two MOTs in series, one 2500 volt unit, and one 2300 volt unit
Capacitor: MMC with 3 strings of 9 330nf 2kvdc GE snubbers (polypropylene
high current types), for 110nf at 18kvdc
Gap: async rotary at 460 BPS, built with 8 1/2" tungsten carbide squares
mounted on a 6" dia. x .125" Al circle, stationaries are two pieces of 1/4"
brass threaded rod
Primary: 1/4" Cu tube w/ 1/4" spacing approx. 7.5" inner diameter, tapped at
8.2
Strike ring: 1/4" Cu tube approx. 2" above primary, 2" short of being a full
turn
Secondary: 4.25" x 23.75" thinwall PVC wound with 28 guage magnet wire,
first turn slightly lower than the bottom of the primary
Toploads: 1.75" x 8.75" anti-corona ring directly on top of secondary, 4.5"
x 18" Al flex duct approx. 6" above anti-corona ring, 7.75" x 30" Al flex
duct directly on top of 4.5" x 18" toroid, small breakout point, sticks out
1/2" from middle of large toroid
Ground: 1 4' copper ground rod, connected with 6 guage welding cable
Wiring: 14 guage from plug-in to variac, 14 guage from variac to coils
plug-in, 16 guage microwave cord on coil, 16 guage from transformer to spark
gap, tank wiring is all 6 guage welding cable and 6 guage thhn.

This is most everything I can think off the top of my head, and all measures
are probably not exact. If there are any questions on anything I'd be more
than happy to answer them. I'm going to start working on an actual webpage
sooner or later, which will have all my info, and I'll post it to the list
as soon as its done (or mostly done).

Jason Johnson
G-1 #1129

>
> Regards,
>
> Greg
> http://hot-streamer-dot-com/greg
>
> --- Tesla list <tesla-at-pupman-dot-com> wrote:
> > Original poster: "Jason Johnson by way of Terry
> > Fritz <twftesla-at-qwest-dot-net>"
> > <hvjjohnson13-at-hotmail-dot-com>
> >
> > I believe that I have just set a new spark length
> > and efficiency record for MOT
> > coils! I got three 74" strikes in a single run from
> > my MOTcoil, and one
> > confirmed (we had three people see it and measured
> > it 4 times because I almost
> > couldn't believe my eyes) 78" strike! The coil is
> > running with a new 460 bps
> > async rotary gap (geeks see my other posts on
> > tungsten carbide rotary spark
> > gap, on the geek list) that I built with 1/2"
> > tungsten carbide squares, on a 6"
> > Al rotor, and two 1/4" brass threaded rods for
> > stationaries. I just completed
> > the gap the other day and fired it up for the first
> > time on the coil 3 hours
> > ago.  This is even more amazing when you consider
> > that I'm running on a 120
> > volt 15 amp breaker, and haven't tripped it once
> > since I added the new gap,
> > this is also with a 20 amp fast blow fuse in there,
> > so I wasn't overloading the
> > breaker much, if at all, and I'm cranking the variac
> > all the way up and running
> > for minutes at a time. I'm running 2 MOTs in series
> > for about 4800 volts with
> > no voltage doubler, protection filter or even a
> > safety gap! This gap makes my
> > MOT coil ROCK! The strikes were all to a ground rod,
> > sparks were all seen by
> > me, my dad, and my friend, and measured from the tip
> > of the breakout point to
> > the ground rod, straight line distance. None of
> > these measurments uses
> > estimated lengths from curvy sparks etc, just point
> > to point measures.
> >
> > Jason Johnson
> > G-1 #1129
> >
> >
> >
>
>
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