RE: Designing BIG Secondary Coil

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

Original poster: "Dave Hartwick by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ddhartwick-at-earthlink-dot-net>

John,
I assume you are referring to inter-turn insulation breakdown. As I was
telling the good Dr. R, I was thinking about a ~12" x 24", wound with
something like #20 wire. The hope is fitting max perf in my vertically
challenged basement (7'); though what is the point? This new 4" x 24" sec is
already overwhelming the area. An exercise in efficiency, I suppose.

I envy the boys that are able to fire outside, which is unthinkable in my
classically suburbian environs.
Dave


Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<FutureT-at-aol-dot-com>



>
> Of course, there is a minimum vertical height limitation, lest excessive
> striking of the strike rail become a problem.



Dave,

And coil breakdown, if it's too short.


>
> A suitable form for such large dia secs is always a problem. I think the
PVC
> tubing I've seen at the 12" mark has distressingly large wall thickness,
but
> is this a real world issue?



Not an issue.

>
> Sonotube is known to inflict low Q, though it has been used on very
> large coils.


I've heard there are various materials used in some sonotubes,
some are very lossy.  I'd avoid sonotube because of the possible
unknowns.

John