Re: A new idea? ...different geometries in coil constructionmore efficient?

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

Original poster: "marc metlicka by way of Terry Fritz <twftesla-at-qwest-dot-net>" <mystuffs-at-orwell-dot-net>

Matt,
The only improvement i've seen in conical primaries was with my 10-1 l\h
ratio coil. It seems to couple a bit higher on the windings giving
better output then a flat spiral.
 Of coarse 10-1 coil ratios are a bit much within themselves.
Marc M.

Tesla list wrote:
> 
> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<FutureT-at-aol-dot-com>
> 
> In a message dated 4/7/02 3:22:41 AM Eastern Daylight Time, tesla-at-pupman-dot-com
> writes:
> 
> Matt,
> 
> I once tried using a copper tubing primary which was flat
> for the outer portion, but had a 45 degree angle for the inner
> portion.  It gave the same results as any other shape.  I've
> never seen any spark length benefit from any particular
> primary shape.  Although some shapes may have a slight
> theoretical advantage, I very much doubt that any spark
> length improvement can be seen.  The losses in the primary
> are considerably smaller than the spark gap losses, so the
> gap losses dominate.
> 
> Cheers,
> John
> 
> >
> > I've been tinkering with primary coil inductance based on setting
everything
> > else except the hypotenuse as variables wrt theta (angle of rise).  Looks
> > like the best inductance is right around 18.36 degrees (small peak).  Now
> > this isn't anything new, but, has anybody ever tinked around with coil
> > designs using a geometry other than a linear coil? (in essence, cones,
> > solenoids, spirals are linear in cross  section).  Although the engineering
> > could become a real pain in the rear with these different shapes, but maybe
> > there is something out there that could be more efficient than the common
> > shapes used.