Re: Secondary Elevation

Most medium size coils work good with the sec starting approx 3/4 inch above
the horizontal plane of the primary coil with the pri to coilform distance
also 3/4 inch.  This works good with coils 6-12 inch dia.   Larger coils
need more separation and the best way is to set up the experiment and
actually measure your coeff. coupling and then set around 0.18.  (see
archives section).

Dr. Resonance

-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Friday, October 15, 1999 5:38 AM
Subject: Secondary Elevation

>Original Poster: "Steve Young" <youngs-at-konnections-dot-com>
>Hello TC experts,
>To get the maximum performance from a TC and to eliminate damaging
>secondary "racing sparks" along its surface, the pri-sec coupling needs to
>be optimized.  This is typically done by varing the height of the bottom of
>the secondary winding in relation to the plane of the primary winding
>(assuming a flat spiral).  Some questions:
>1) Is there a rule of thumb or empirically derived equation which gives a
>good starting point for pri-sec height difference for a given sized
>secondary?  E.g., something like height difference = sec diameter/4?
>2) I would appreciate ideas you have incorporated into your coils for
>varying the pri-sec height differences.  I am interested in building a
>research coil which has this parameter adjustable in, say, quarter inch
>increments.  Ideas for either adjusting the secondary or primary height,
>while still retaining physical stability and esthetics of both, are what I
>Thanks in advance,
>--Steve Young
>P.s.  I suppose the best answers to these questions would be candidates for
>the FAQ compilation.