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Re: TC Secondary Turns

Subject:       Re: TC Secondary Turns
       Date:   Wed, 11 Jun 1997 17:34:13 +1200
       From:   "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
Organization:  Wellington Polytechnic, NZ
         To:   tesla-at-pupman-dot-com


Hi John,
         See my note on coupling under the "k quiz" heading. I think 
the answer might lie there rather than the type of winding on the 
secondary coil. Or maybe Zo matters most as Greg suggests. How come
so much is still up for investigation??

Malcolm

> >From: "John H. Couture" <couturejh-at-worldnet.att-dot-net>
> >Subject: TC Secondary Turns
> >
> >
> > To All -
> > 
> > It looks like Tesla coilers have gone full circle when it comes to the
> number of TC secondary turns. Several years ago the recommended number
> of
> sec turns was about 400, then it went up to 1000, now it is back to 400
> turns. 
> >
> > Of course the reason 1000 turns were being used is because 400 turns of
> enameled magnet wire were used by newcommers and secondaries were being
> destroyed when going to higher powers. However, 1000 turns does not
> appear
> to be optimun because some coilers are now doing better with about 400
> turns
> but with more insulation for the higher powers. 
> >
> > The question now arises as to how should the secondary be designed for a
> certain input power to the TC to give optimun spark length? Assuming
> that
> about 400 turns is optimun for all sizes of coils what should the wire
> size
> and insulation be? Also what size should the secondary radius be to give
> the
> secondary inductance and mutual inductance for producing the optimun
> spark
> length? This optimun spark length may be equal to or greater than with
> magnifiers.
> >
> >  There are a few TC computer programs that give recommendations including
> the JHCTES computer program. The programs use either empirical data or
> the
> programmer's guesstimates. There are no standards for estimating the
> secondary voltage or the rating of wire insulation for Tesla coil work.
> Agreement will have to be reached amongst coilers for these parameters
> before any further progress can be made for designing Tesla coils.
> >
> >  All comments are welcomed.
> >
> >  John Couture