effects of spacing secondary windings

From:  D.C. Cox [SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent:  Sunday, June 07, 1998 3:58 AM
To:  Tesla List
Subject:  Re: effects of spacing secondary windings

to: Clay

With this size coil it is not necessary to space the windings.  Just use a
good 3 kV PVC insulated stranded wire for the coil (approx 16-18 AWG) and a
good toroid on top.  The best performance will be achieved with the largest
diameter that you find practical for your environment, ie, perhaps 24 or 36
inch dia with a height/dia ratio of approx 4.5:1 at this power level.  The
tradeoff is that the larger diameter requires a larger toroid such as a 36
x 8 1/2 inch size which is quite expensive for a home system unless you
make it out of ducting.


> From:  Larry Bud Melman [SMTP:gasman-at-althea.a-line-dot-net]
> Sent:  Saturday, June 06, 1998 9:00 AM
> To:  tesla-at-pupman-dot-com
> Subject:  effects of spacing secondary windings
> 	Hello all,
> 	I'd like to tap into the knowledge of all you theorists out there,
> and ask a question about a topic recently in discussion here: spacing the

> windings of the secondary with an inert spacer (eg. fishing line) to
> breakdown.
> 	Common intuition tells me that a 21" coil wound with 1000 turns of 
> magnet wire (tightly) is not the same coil as a 42" wound with the same
> turns with one diameter between each turn, right?
> 	What is the effect (if you think there's any) of winding a secondary
> in this fashion on the frequency, inductance, self-c, etc?  I'm presuming
> such winding renders programs like wintesla useless?!
> 	I'm starting construction of a fairly large coil, and I want to space
> the windings; however, obviously, whether or not I do is going to make a
> difference in the diameter of wire I'll be using - my secondary is going
to be
> nearly four feet high, and about 12 inches in diameter (using 10 kVA PP
> supply)....  8-)
> 	Thanks in advance, and happy coiling to all.
> 						Clay.