Re: A new idea? ...different geometries in coil construction moreefficient?

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

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi Antonio, All,

Tesla list wrote:

> Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>
>
> Tesla list wrote:
> >
> > Original poster: "Mr Gregory Peters by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <s371034-at-student.uq.edu.au>

<snip>

> The coil will really quite probably "burn up" due to racing sparks if
> k is too high (although it's still not clear why).
> <snip>
> The losses decrease with high k due to the faster energy transfer.
> What is frequently mentioned is that too high coupling causes racing
> sparks, and that best performance is obtained just below this condition.
> So, there is experimental evidence that increasing k is a good thing.

My observation of racing sparks have always been sparks appearing to start
at the top and arc nearly perfectly
vertical down the coil. Along the way, there have been times when the
racing arc would break away from the secondary
(typically hitting the outer primary winding).

A hint of why I expect is due to the two waveforms at high k causing high
enough potential at the nodes of unevenly
distributed voltage at the secondary. I expect the arc travels down to the
next node (directly vertical) and
periodically breaks out from one of these voltage nodes lower down on the
secondary (sometimes not, in which case it
finds the primary inner winding).

Bart