Re: Need Formula for length of spiral

["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>

Hi John - 

Primary length (inches): pi*n*(r+(od/2)) 

where: 
pi = 3.14 
n = turns 
r = inner radius 
od = outer diameter 

Bart 

Tesla list wrote: 
>
> Original poster: "John Tomacic by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <tesla_ownz_u-at-hotmail-dot-com> 
>
> Hi everyone, 
>
> Does anyone have a formula that I can use to calculate the length of wire 
> required in a flat spiral coil? I have the formula for inductance, however, 
> I really need the wire length. 
>
> Thanks, 
>
> John 
> SST coiling in Ottawa. 
>
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