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RE: Iron transformer positioning under the primary experiment

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Dan,

Smoking hot is about 150C, a MOT weighs 10 pounds, and a few minutes is 180 seconds. The specific heat of iron is 0.444 J/gK or 201.4 J/(pound-C). So we need 1400 watts going into the MOT over 3 minutes to raise the temperature 125C!! So it would have to take 60-80% of your 120VAC coil's power to do that!!

So buy first look, the numbers don't seem right unless I assumed something wrong or the coil's performance was vastly impacted.



At 05:42 AM 7/7/2006, you wrote:

I'm not sure i agree with this.  As an experiment, i placed a MOT next
to my DRSSTC III coil and the core was SMOKING hot after only a few
minutes of run time.  I suspected this would occur, as this was the same
thing that happened with my dual 833A coil several years back.

Not sure how much this would effect performance, but energy is being
loss to the core.


On a conventional lossy spark gap coil, even a very close MOT in a
bad position would not be noticed.  We often see coils with
transformers and such under the primary.  It might be the case that
their added losses are not too great.  But the open core MOT will
reject eddy and sorted turn currents.  That is not the case for say a
NST cover.