RE: Secondary size - the Why

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

Original poster: "Luke" <Bluu-at-cox-dot-net> 

Thank you for doing that and then posting it.
I was beginning to think I was only annoying people by being so
persistent on asking why.  I am glad the question got you thinking.  I
am wrapped up in trying to understand the "basics" that most on the list
seem to already understand and probably would not have taken the time to
do what you did.

To all on the list:
Sorry if I seemed to be complaining about the list itself.
There was never an intention to do that.
On the contrary I love it and it is a chance to hear from lots of people
that know more than I do.
So this is an apology to any I may have offended.

Luke Galyan
Bluu-at-cox-dot-net

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Sunday, January 18, 2004 10:11 AM
To: tesla-at-pupman-dot-com
Subject: Re: Secondary size - the Why

Original poster: Mddeming-at-aol-dot-com

Hi All,

      I have spent the last two days trying to figure out an answer to
Luke's question of why ratios of 4:1 or 5:1 are good for secondaries. I
think I have found a partial answer. In a TC, it is desirable to make
Cp/Cs
as large as practicable to maximize Vout. More of the energy gets into
the
streamers if the distribution of Cs between C self and C top is weighted

towards C top.
      The problem thus becomes: "For a given length and diameter of wire,
is
there a particular diameter and length that minimizes C self?" After
running a number of coils with 1667 ft, 2000 ft, and 6000 ft. of #24
wire
through an Etesla6 analysis, it turns out that in each case I tried with

secondaries from 2in. to 20 in.diameters, the Cself min. point occured
when
the H/D ratio was between 4:1 and 5:1. It would take considerable time
to
run a large number of different gauges, lengths, and pitches through the

program and the result would still be empirical rather than theoretical
and
by no meas exhaustive. But at least it points the way to some rationale
for
using these ratios as a starting point.
Matt D.

Matt D.