Re: New Inductance Formula

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

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Dave,
I end up at 0.014149.

Here's the coil again in meters:
Av Radius = =((13.9775" - 0.625") / 2) / 39.37 = 0.169577089 meters
Turns = 298
Wire length = (7127.67" / 39.37) = 181.0431801 meters
c = (2.99 * 10^8) = 299000000
Cd = (2.112*10^-4) = 0.0002112
LmH = 0.014149

Are you sure this isn't henry's instead of mH? The denominator ends in
10^-7 on the web page (is
that really mH and your email post is henry's?).

Take care,
Bart


Tesla list wrote:

> Original poster: "David Thomson by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <dave-at-volantis-dot-org>
>
> Paul,
>
> Have you actually tried the formula?  What about it is nonsense or crank?
> I'm surprised.  Of all people, I thought you would be the first to try it
> and see what it does.  It wouldn't bother me at all if you could show it
> doesn't work.
>
> I'm using this formula in real Tesla coil design and it works great.  Humor
> yourself and try it please.
>
> Here it is again, hopefully in better format...
>
>              (N * R)^2
> mH = ---------------------------
>      L * c * Cd * 16 *pi *10^-4
>
> N is the number of turns
> R is the average radius
> L is the length of the wire (not length of the windings)
> c = 2.99 x 10^8
> Cd = 2.112 x 10^-4
> pi = 3.14159
>
> I have a little more detail on the formula and how Cd was derived at
> http://www.tesla-coil-builder-dot-com/inductance.htm
>
> Dave
>
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Sunday, April 28, 2002 11:11 AM
> To: tesla-at-pupman-dot-com
> Subject: Re: New Inductance Formula
>
> Original poster: "Paul Nicholson by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <paul-at-abelian.demon.co.uk>
>
> Jim wrote:
>
> > Do ANY of you guys really understand all that???
>
> Nope.  It's complete nonsense.  Best thing is to ignore crank
> postings.  See the various Tesla related yahoo groups for examples
> of the consequences of not doing so.  Those who enjoy the
> ultimately futile task of refuting pseudoscience will find
> plenty of sport.
> --
> Paul Nicholson
> --