Re: secondaries

["Steve Rosenthal" <sdrosen-at-cwia-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Mike,
Go for it man!, your what it's all about, you keep on the track your on and
you will probably show us all a thing or two!
And please keep us updated. I really like your ideas. Probably you will find
the way to tap into that "cosmic force" Tesla was always talking about. You
are what coiling is all about, in my humble opinion!
Steve R.
______________________________________
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, August 24, 2000 9:34 PM
Subject: secondaries


> Original poster: "acmnovak" <acmnovak-at-email.msn-dot-com>
>
> Howdy,
> I have been constructing a small demo coil for my brother's band lately.
The
> secondary was 1.5" in diameter which puts the small in "small demo coil".
The
> secondary measured 1.5" x 12"  (4cm x 30cm) with 28 AWG wire before the
mod.
> This coil is a beauty, it has nice PVC endcaps, a 1" diameter steel
bearing for
> a topload, and a deep dark red enamel.  We got it to put out up to six
inch
> (15cm) arcs, but that took about 500 watts in... and I later found out
that the
> ground wasn't even making contact! That's *okay* if you're a beginner, but
I
> know I can do better. So, I set about making some simple modifications to
make
> it a more conventional, conevtional coil.
> First, I removed enough wire and pvc to make it close to a 5:1, h:w ratio.
> Next, I potted the secondary's interior with wax, as I intended on getting
arcs
> as long, if not longer than the coilform. BTW- The topload is connected
via a
> hole in the top of the seconday. I know it's a no-no, but it looks better.
i.e.
> "demo coil" Rather than installing a corona ring to stop premature
secondary
> arcing, I put a nice clear bead or silicone around not only the top but
also
> the bottom. Upon putting the specs into WinTesla, I got a resonate
frequency of
> ~ 2MHz... Ouch!
> That's RF!!!
> I'm planning on a new three layer primary coil made with lexan supports
and 10
> guage solid copper wire... What do you think of that? Maybe a total of
nine or
> twelve turns...
>
> I like messing with tiny "model" coils, because you can try some really
novel
> designs without breaking the bank on expensive copper tubing, pvc, epoxy,
lexan
> etc...
> I was thinking of making a conical secondary around 8 or ten inches tall.
It
> seems easier, but more time consuming, to make smaller coils. Do you
honestly
> think it would be *easy* to just go out and find a four foot tall conical
form
> made from a moisture-resistant material for under
> $100?
> I'd like to try and use a really big waxed cardboard cup. You know, like a
Big
> Gulp from 7-11...
> A fourty or fifty ounce drink cup would make a great little conical coil.
Just
> make sure and wind from the narrow end to the wide end... otherwise things
> could get a bit frustrating.
> Maybe it wouldn't have the best structure, but you could coat the inside
of the
> cup with quick set epoxy whil winding, and remove it afterwards...
>
>
>       (               )
>            /     \
>           /       \
>          /         \
>         /           \
>  ooo /             \ ooo
> -----------------------------
>
> * Mini-Wardenclyffe *
>
> Just one of those thing you think of in the wee hours of the morning...  :
O
> Safe coilin',
> Cheers,
> Later,
> Regaurds,
> Whatever,
>
>     -Mike
>
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