Capacitance of a cylinder coil

• To: "'Tesla List'" <tesla-at-pupman-dot-com>
• Subject: Capacitance of a cylinder coil
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Wed, 8 Apr 1998 08:16:03 -0500
• Approved: tesla-at-stic-dot-net

----------
From:  Jim Lux [SMTP:jimlux-at-earthlink-dot-net]
Sent:  Tuesday, April 07, 1998 8:09 PM
To:  Tesla List
Subject:  Re: Capacitance of a cylinder coil



> From:  Antonio C. M. de Queiroz [SMTP:acmq-at-compuland-dot-com.br]
> Sent:  Monday, April 06, 1998 6:18 PM
> To:  Tesla List
> Subject:  Re: Capacitance of a cylinder coil
> 
> Erik wrote:
> 
> > Self Capacitance of an air core coil
> > Medhurst formula
> 
> Try also this, due to Medhurst too:
> 
> C=11.26*length+16*radius+76.4*radius^(3/2)/length^(1/2) pF
> 
> Distances in meters. Note that the number of turns doesn't appear.
> 
> Antonio Carlos M. de Queiroz
> http://www.coe.ufrj.br/~acmq
> 
I note that this tracks pretty well ( a few percent) with the tabular
Medhurst, as provided by Rzeszotarski in an earlier post (and manifested on
my web page). Does the original reference provide any bounds for where the
formula is valid? Do you have an actual reference for this (i.e. is it the
same "Wireless Engineer" papers, etc.)?

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