Re: Flat secondary measurements

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

> Original poster: "Barton B. Anderson by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>
>
> Hi Paul -
> > Original poster: "Paul Nicholson by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <paul-at-abelian.demon.co.uk>
> >
> > Inductance Contest
> > ------------------
> > You have 426.72 metres (1400 feet) of 24 awg (0.51055mm diam) wire.
> >
> > What's the highest inductance you can achieve with it?
> >
> > Coils must be single layer, with concentric windings.  The minimum
> > allowable pitch is 0.6382 mm (0.025125 inches) which corresponds to
> > a spacing ratio of 0.8.
> >
> > Answers direct.
>
> My answer (right or wrong) is 32.7mH rounding turns to nearest integer, or
> when the inner radius is as
> close to zero as mechanically possible (I used .51055mm).
>
> Or when the average width is minimum. Everything is closer together,
compact.
>

which maximizes the interturn coupling, so you get as close to the N^2 as
you can.