RE: H/D ratio

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

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

4.5:1 is good I get it.
So I can build my secondary 2" wide and 9" tall with an input of 900
watts.
Seems we have been here before.

If 2" coil is bad and 4 is better and 6 is better and 8 is even better
then a 50" dia coil would be incredible.

So maybe I should just go with a 50" diameter coil so my height would
work out to be 225".  I could set this up and fire off some long arcs in
my back yard powering it with 900 watts.

These are both extremes.
Where is the middle ground?
Ok here is where you give examples of coils that are in the 900watt
range and tell me the diameters and heights.
NO NO NO
Don't go there please.

I am looking for WHY the middle ground is good and HOW you or they have
figured out where that middle ground.

I re word this question in every way I can think of only to be greeted
with a well meaning response that tells me this works well.  I WANT TO
KNOW WHY!!

Luke Galyan
Bluu-at-cox-dot-net

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Thursday, January 15, 2004 6:02 PM
To: tesla-at-pupman-dot-com
Subject: Re: H/D ratio

Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>


The optimum is 0.9.  A coil this short will have constant arcing
problems
top to primary and top to ground.  A 4.5:1 gets the toroid a distance
away
from the primary and allows an even potential buildup along the
elongated
sec coil.

Dr. Resonance

  >
  > I found on the net in a few places stating that the maximum amount of
  > inductance from a coil is when the height is the same as the
  > diameter.  This is a 1:1 ratio.
  >
  > If that is the best inductance ratio then why is this ratio not used
for
  > the tesla coil secondary to take advantage of a high inductance ratio
  > between the primary and secondary?
  >
  > Luke Galyan
  > Bluu-at-cox-dot-net
  >
  >
  >
  >