Re: Formula's (fwd)

---------- Forwarded message ----------
Date: Sun, 12 Jul 1998 21:56:24 -0700
From: "Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Formula's (fwd)

Shaun wrote:

> Also I can't remember how to find the length of a spiral. I also need
> to find the length for the primary.

Length of wire for a solenoid coil with n turns, radius r, and length m:
Wire length=sqrt((n*2*pi*r)^2+m^2)

Length of wire for a flat spiral coil with n turns, internal radius r1 and
external radius r2:
Wire length=sqrt((n*pi*(r1+r2))^2+(r2-r1)^2)

All the distances consider the center of the wire. The second squared
terms are usually negligible, but with them the expressions are exact.
"sqrt" is square root, pi=3.1416.

Antonio Carlos M. de Queiroz