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Re: Need coil help

To: tesla@xxxxxxxxxx
Subject: Re: Need coil help
From: "Tesla list" <tesla@xxxxxxxxxx>
Date: Fri, 10 Nov 2006 12:14:04 -0700
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Original poster: Mike <megavolts61@xxxxxxxxx>

Hi steve,
   A very close approximation is the Wheeler formula.

              (NR)^2
L =       -------------------
            (8*R + 11*W)

Where R = the average radius of the spiral and W = outer radiusminus the inner radius of the winding

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