Re: Wire Length

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

Original poster: "Terry Fritz" <twftesla-at-uswest-dot-net>

Hi Jason,

Electrically, the length does not matter.  The old wire length for a certain
frequency stuff has been shown to be a myth.  Most people are winding with
about 800-1200 turns these days.

Of course, the length of wire on a secondary is: 

wl = pi x n x d

wl = wire length
pi = 3.14159
n = number of turns
d = diameter of secondary

where the same units of measure are used throughout.  That is not the "exact"
formula since it is about a foot or two short but close enough for practical
purposes.  The real formula needs the wire stretched very slightly as:

wl(actual) = SQRT(wl^2 + (length of secondary)^2)

Cheers,

        Terry


At 08:29 PM 4/28/2001 -0400, you wrote: 
>
>     Hey,
>  
> Anyone know a formula to calculate the needed length of wire for a secondary
> coil?
>  
> -Jason