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*To*: tesla-at-pupman-dot-com*Subject*: RE: New Inductance Formula*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Thu, 02 May 2002 17:00:41 -0600*Resent-Date*: Thu, 2 May 2002 17:15:13 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <M89mxD.A.Z_C.3hc08-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "David Thomson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dave-at-volantis-dot-org> Hi Jan, >I got a new, provocative version... hehe... ;) > (N*R)^2 * 10^-6 * kg * m > L = -------------------------- > [(350*R)+(390*H)] * coul^2 > (R and H in _metres_, N is unitless) Here is a formula that approximates the inductance of the coil and the inputs are in meters. It works good for solenoid secondaries with 3 to 1 H/D ratio. But it differs noticeably from Wheeler's formula when the H/D ratio is .5/1 or lower. (N*R)^2 * 4 * 10^-6 * kg * m henry = ---------------------------- (R + H) coul^2 R and H in meters, N is unit less. Dave

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