Re: Tesla's CS Coil Data from ScanTesla and all....

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Malcolm Watts" <m.j.watts@xxxxxxxxxxxx>

H Matt,

On 27 Jun 2005, at 11:51, Tesla list wrote:

> Original poster: Mddeming@xxxxxxx
>
> In a message dated 6/26/05 10:34:13 P.M. Eastern Daylight Time,
> tesla@xxxxxxxxxx writes:
> Apart from the coupling I measured another interesting aspect of
> the design was the choice of aspect ratio for the extra coil (or at
> least some variations of it) - 1:1 for some. That ratio scores the
> highest Q for any coil I've measured and is also cited for that reason
> in other literature.
>
> Malcolm
>
>   Hi Malcolm,
>
>      It has been shown in several references that the theoretical
>      maximum
> Inductance for a given length of wire (and hence for a given
> resistance) occurs in a helical coil when h=0.9r, which, however,  is
> not a practical ratio for most coils. The 1:1 ratio would be
> consistent with having the best XL/R in a "practical " dimension coil.
>
> Matt D.

Maximum inductance <> maximum Q. This is also cited in literature and
is something I've also measured.

Malcolm