Re: All pain no gain

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

Original poster: "Nathan Morris by way of Terry Fritz <twftesla-at-uswest-dot-net>" <themfam-at-home-dot-com>

Bart,
The finer details include a secondary 4.5 x 21, 19 inches of which are wound
with #30 mag wire, single build insulation  with
a wire spacing of .001.  First  turn of the primary has an  ID of 5.5 and it
is made of insulated THHN stranded #10AWG.  The spacing is .365 center to
center and was averaged using dial calipers.  The primary has a total of 23
turns.  The gap is blown and has 4 individually adjustable electrodes.  My
cap is (was) made up of 8 D6-30-20 .02uf 3KVWDC F-C-I  caps.  The body is
porcelain and they are (were) oil filled.  They are ebay specials and I have
no information on the manufacturer
but I have them set up for a total c of .01uf.  My torroid is dryer duct and
has an OD of 18 and a cord of 4.  My NST is a 7.5 kv 20 ma.
    About 30 minutes ago I was getting continuous 5 inch sparks with the
primary taped at 23 by laying a car antenna across the torroid and aiming it
at the screw that holds the switch plate on the garage wall. I doubt that
qualifies as a streamer.
One of the caps bled out and so here I am again.  Thanks for your concern
and for your excellent contribution to the list.  I am off to ebay to check
out better HV caps.
--Nate









----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, March 09, 2001 8:35 PM
Subject: Re: All pain no gain


> Original poster: "Barton B. Anderson by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <tesla123-at-pacbell-dot-net>
>
> Hi Ed, Nate, John C., All,
>
> I calc'd JavaTC against your values. See below:
>
> Tesla list wrote:
>
> > Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> <Esondrmn-at-aol-dot-com>
> > Bart,
> >
> > The idea of different programs producing different numbers is expected I
> > guess.  It would be nice if we could rely on the programs to produce
> > consistent results, within a few percent anyway.  I will supply the data
on
> > my smaller coil here and maybe others could run it on their programs and
> > report back.  In this situation, I am solving for the primary tap point.
> > Secondary: 3.0" O.D.  closewound,  winding length 13.1", #28 wire, using
72.7
> > turns per inch
> > Toroid capacitance" 18 pf
> > Primary:  5.8" I.D., diameter of wire .10", spacing between turns .35"
(not
> > center to center - but actual clearance), flat spiral
> > Primary tank capacitor:  .009 ufd
> >
> > I calculate the proper tap point should be 10.9 turns.
> >
> > Ed Sonderman
>
> I used the above inputs except changing the primary spacing to .45"
(actual
> clearance
> of .35 plus the wire size of .1") because JavaTC uses center to center
spacing.
> JavaTC shows 11.04 turns for the tap point and very close to your 10.9
turns.
>
> All of our programs should be about this close to one another. Exactly the
> reason for
> my concern of the inputs Nate used. An underlying concern of mine is that
the
> calculator may be a little too complicated and/or confusing for new users.
> Time will
> tell. For example, if Nate entered a value of 0 for the spacing between
> turns because
> he figured it was a closewound coil? These type of inputs I suspect need
> clarification for new users. I won't change the secondary spacing input
> because it
> serves spacewound coils, but clarification can certainly be added to the
> program.
>
> Nate, if you get a little time, let me know (off list) any troubles or
> confusing
> factors while using JavaTC. This type of info is really a big help for TC
> programmers. I'm sure that goes for all other TC programmers as well.
>
> Bart A.
>
>
>