Re: Skin Effect

To: "'Tesla List'" <tesla-at-poodle.pupman-dot-com>
Subject: Re: Skin Effect
From: Tesla List <tesla-at-stic-dot-net>
Date: Sun, 3 Aug 1997 07:51:15 -0500
Approved: tesla-at-stic-dot-net


From: 	John H. Couture[SMTP:couturejh-at-worldnet.att-dot-net]
Sent: 	Sunday, August 03, 1997 2:04 AM
To: 	Tesla List
Subject: 	Re: Skin Effect

At 04:13 AM 8/1/97 +0000, you wrote:
>
>From: 	Robert Davis[SMTP:RE.Davis-at-btinternet-dot-com]
>Sent: 	Thursday, July 31, 1997 3:54 PM
>To: 	'Tesla List'
>Subject: 	RE: Skin Effect
>
>From: 	John H. Couture[SMTP:couturejh-at-worldnet.att-dot-net]
>Sent: 	Thursday, July 31, 1997 3:25 AM
>To: 	Tesla List
>Subject: 	Re: Skin Effect
>
>At 11:53 PM 7/29/97 +0000, you wrote:
>>
>>From: 	Robert Davis[SMTP:RE.Davis-at-btinternet-dot-com]
>>Sent: 	Tuesday, July 29, 1997 4:35 PM
>>To: 	'tesla-at-pupman-dot-com'
>>Subject: 	Skin Effect
>>
>>Hi,
>>
>
>>
>>Rob Davis (UK)
>>
>>-------------------------------------------------       big snip
>
>  Rob -
>
>  You are talking about effective resistance which includes all of the
>effects you mentioned. The effective resistance Reff is found by
>
>        Reff = Xl/Q
>
>  The Xl is easily found and you can find the Q using a scope as I show in
>the Tesla Coil Notebook. This is the only way to find the Q of a coil
>operating at high voltage. The Q is found by
>
>        Q = 1.364 x A   where A = 10% amplitude from the log dec.
>
>  John Couture
>
>>
>
>
>In the above equation could you tell me what XI is/are please?
>
>Thank you for your reply.
>
>
>Rob Davis.
>
>------------------------------------------------------------
>
   Rob -

   The Xl is equal to  6.283 x F Ls    where the F = operating frequency
and  Ls = inductance of the secondary coil found with the Wheeler equation.
The Wheeler equation is

       Ls (uh) = r^2 x n^2/(9r +10b)     where r = radius in inches   n =
number of turns    b = length of coil inches

   John Couture