Re: H/D ratio

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

Original poster: "J Dow" <jdowphotography-at-hotmail-dot-com> 





>I found on the net in a few places stating that the maximum amount of
>inductance from a coil is when the height is the same as the
>diameter.  This is a 1:1 ratio.
>
>If that is the best inductance ratio then why is this ratio not used for
>the tesla coil secondary to take advantage of a high inductance ratio
>between the primary and secondary?
>
>Luke Galyan
>Bluu-at-cox-dot-net


this is an interesting topic.
there are examples of pancake coils out there. it looks to me like it would 
be a fascinating experiment
to wind a 1500 turn coil that's only 1" tall and 10" across, the hole thing 
could be cast in epoxy.
the pri coil could be below or around it also cast in the epoxy.
I like the idea of alternative coil designs. I think it would be fun to 
make a small coil with super insulation and over power it to the max and 
see if you could get your 50" sparks out of a 10" disk.

read you later
Josh

_