--

To: tesla-at-poodle.pupman-dot-com
Subject: --
From: Tesla List <tesla-at-stic-dot-net>
Date: Thu, 27 Mar 1997 08:45:43 -0600
Approved: tesla-at-stic-dot-net
Subject: 
        Re: 2 wires
  Date: 
        Thu, 27 Mar 1997 00:57:58 -0500 (EST)
  From: 
        richard hull <rhull-at-richmond.infi-dot-net>
    To: 
        Tesla List <tesla-at-pupman-dot-com>


At 12:36 AM 3/26/97 -0600, you wrote:
>Subject: 
>        2 wires
>  Date: 
>        Tue, 25 Mar 1997 21:11:28 -0800
>  From: 
>        Gary Weaver <gweaver-at-earthlink-dot-net>
>    To: 
>        tesla-at-pupman-dot-com
>
>
>I just talked to a friend that is a Professor at the local University. 
>He said he had a student that built a Tesla Coil as a class
>project a few years ago.  The student wound the secondary coil with 2
>wires in parallel.  The wires were #24 solded together
>at both ends and both wound on the PVC pipe together side by side.
>
>#24 wire is .0201 diameter.  This would be equal in width to #18 wire
>.043 diameter.  Two #24 wires in parallel would be
>equal to one #21 wire in circular mil area.  Two #24 wires in parallel
>would be equal to one #21 in wire resistance.  Within less
>than 1%.
>
>Has anyone tried this?
>
>This would make the coil longer and may be a disadvantage because of the
>diameter to length ratio.
>
>This gives me an idea.  What if I were to wind a coil with #24 wire then
>wind another coil right over the 1st coil and connect
>them both in parallel.  This would make the diameter to length ratio
>smaller.  
>
>Has anyone tried this or know if will work?
>
>Gary Weaver
>
>
Gary,

The first scenario you speak of is called "bifilar winding" and for my
money
it is a great waste of time, effort and wire!  The things never work out
as
good as a coil wound with the proper wire in the first place and hold
back
the coil's inductance, which is a big no-no.

Your plan of over winding a second layer has been tried by Tesla himself
and
it failed due to larger sheet capacitance between windings.  However, do
what I did in the beginning... go against the common wisdom.  Give it a
try.
We here in Richmond found a number of the old axioms for coil building
just
a "load of hooey" when we went again the "accepted wisdom" and found new
and
different ways which were just as good, or in a few cases, even better
than
what was accepted.

Richard Hull, TCBOR