Re: Flat coils & undamped waves (was Wire Length)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Ed Phillips <evp@xxxxxxxxxxx>

Maybe I'm splitting hairs, but I have to disagree about the last 
sentence, of Wheeler formula application for ribbon wire flat 
spirals. Please see my 2004 TCML posting:

http://www.pupman.com/listarchives/2004/October/msg00018.html

especially the 2 graphs:
http://home.tiscalinet.ch/m.schraner/Lstrip_Wheeler.gif
http://home.tiscalinet.ch/m.schraner/Lstrip_NBS.gif

To use the right calculation method can be crucial, when designing a 
ribbon type flat spiral primary: the too high L prediction of Wheeler 
may lead to a too small primary construction.

Kurt"

   Wheeler's APPROXIMATIONS were presented as exactly that, with 
explicit  limits on parameters and the associated accuracy.  This 
last part sometimes gets forgotten, leading to erroneous 
results.  The correct Wheeler formula applied with the correct 
dimensional limits gives good accuracy.

Ed