I'm sure it was not a bad connection.
I know all about heat caused by I^2 x R at connections.
In fact just yesterday I was checking for bad connections on my electric
gokart and I burned my finger! I found a loose connection between a
5/16" post and a ring terminal connected to a 6 gauge wire.
It was some oddity about the 1/2 turn in a potcore. I suspect the low
turns count is also important to the phenomena.

And I think these is exactly why you are pursing it. You believe it must be
due to some fanciful effect because of the "1/2" turn as if 0.5 was more
special than 0.73524 or 1.0.

You have the mindset to those people that think 3.141592... is special. This
causes you to overlook the obvious. First, pi in another base is not
3.1415.... but in any case it must have been some number. In some alternate
universe we could imagine it being 5.43524. In is only special in the sense
that we make it special because it seems different than most other decimals.
In fact though there are a ton of "special numbers".


The theory of ideal inductors does not give any reason why a 1/2 turn should
at all be important. Tim mentioned the promixity effect which would produce
heating throughout the windings and more so for inner windings so it is not
the correct effect here.

Most other phenomena that stand any chance of creating the effect would do
it symmetrical. Why? Because both ends have no special preference for the
heat. This should be completely obvious.

The only chance is if you wrapped the windings in such a strange and crazy
way and a totally screwed up core as to make a retard jealous of your work.

We think of other possibilities that would work in a non-symmetric way but
they just don't seem to gel with physics. No one can say for sure since you
obviously don't have any good investigative information to provide about it.

Almost always things that seem phenomenal are due to simple mistakes. If you
are really serious about it then I would suggest you attempt to reproduce
the result then do a bit more investigation. Until then you might want to
drop it because we don't need another cold fusion story circulating around.
(I'm being facetious)