Re: capacitance equation for toroids

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

Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" <Mddeming-at-aol-dot-com>

In a message dated 6/5/03 8:43:57 PM Eastern Daylight Time, 
tesla-at-pupman-dot-com writes:


>Original poster: "Dr. Resonance by way of Terry Fritz 
><teslalist-at-qwest-dot-net>" <resonance-at-jvlnet-dot-com>
>
>
>Someone on the list recently inquired regarding the equation for a torus:
>
>let D = major dia. measured to outer edge of toroid
>
>let d = minor dia. measured across "inner tube"
>
>then, for conditions in which the ratio of d/D is greater than 0.25,
>
>Cpf = (0.94 *d) + (0.584 * d)
>
>and for conditions in which the ratio of d/D is less than 0.25,
>
>Cpf = 4.57 * (D-d) / ln (8 * (D-d) / d))
>
>
>Another simple equation, although not as accurate (but close for most
>sizes) is:
>
>Cpf = D + d / 2.56
>
>
>For a sphere the equation is Cpf = 1.4 * dia.
>
>
>Dr. Resonance
>
>Resonance Research Corporation
>E11870 Shadylane Rd.
>Baraboo   WI   53913

Hi Doc!

Is that measured in inches, meters, cubits, furlongs, or nautical miles? ;-)


Matt D.