The Best Pmimary Type Was: A few Q's from a beginner

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

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Robert,

I would say... the same thing John said. However, I suspect your comments about
primary types has to do with either some tests you have run or models
you've run?
Kind of curious if the comments stem from a look at surge impedances for
primary
types or maybe flux convergence to a typical solenoid secondary? Obviously, I'm
curious if you could elaborate a little more on the subject.

Take care,
Bart

Tesla list wrote:

> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<FutureT-at-aol-dot-com>
>
> In a message dated 3/30/02 2:29:00 PM Eastern Standard Time, tesla-at-pupman-dot-com
> writes:
>
> Robert,
>
> I am not as confident as you are that the best form is a 45 degree
> form.  I also don't see anything difficult about building it.  I also
> would not say that a flat primary has less efficiency.  I also would
> not say that a solenoid coil has the best coupling or power transfer.
> I also would not say that solenoid coils have more racing sparks,
> and arc over problems.  Any of the primary shapes can be easily
> adjusted to give optimal coupling, and power transfer, without
> arc-over or racing sparks.
>
> It's true that a solenoid coil can give the tightest coupling,
> but tightest does not necessarily mean optimal.
>
> I've used a flat primary for a tube coil, and that worked fine too,
> and was quite efficient.
>
> Certain shapes may have less inductance for a given wire length,
> thereby increasing the losses, but the results on spark length
> will probably not be noticeable.
>
> Cheers,
> John
>
> >
> > Brad: the costruction of the primary is a trade-off. The best form is a 45o
> > cone slightly above the base of the secondary. This is hard to
construct and
> > mount. A flat primary has the least coupeling problems and is easy to
> > construct, but has the least efficency. A solinoid primary has the best
> > coupeling and power transfer, but the most arc over and running arc
> > problems. It is the easiest to construct and most trouble. Tube TC
coils use
> > the solinoid coil primary because they nead the best coupeling to oscilate.
> >