Re: Designing BIG Secondary Coil

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

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