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First light, and a poor performance


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From:  Michael Baumann [SMTP:baumann-at-proton.llumc.edu]
Sent:  Monday, August 24, 1998 6:30 PM
To:  Tesla List
Subject:  RE: First light, and a poor performance

Just some thoughts:
It sounds like your primary coil may be a tad on the small size. I don't
remember what the gauge coversion between mm and AWG is, but more of us
here use 0.25" copper pipe as the primary. this would be about 6.3mm?
Losses in your primary could very well be a contributing factor here.

Your gap seems way too small for 11KV (3mm, or 0.118" (god I hate
coverting))
I'd think you would want to go at least to 0.190" (.8mm spacing?? for 6)

Since the gap is getting so hot, I doubt you are quenching either.. set up a
fan
to try and cool it a tad. (though at 4KW, I doubt your series gap stands a
chance)
Consider an RQ style gap. (0.75 or 1.0 inch copper pipe, 2" long, side by
side
with gaps on the order of 0.03")

--
Michael Baumann  Optivus Technology Inc.|Loma Linda University Medical
Center
San Bernardino, California. (909)799-8308 |Internet: baumann-at-llumc.edu



> -----Original Message-----
> From: Tesla List [mailto:tesla-at-pupman-dot-com]
> Sent: Sunday, August 23, 1998 9:41 PM
> To: 'Tesla List'
> Subject: First light, and a poor performance
>
>
>
> ----------
> From:  Steve Rodway [SMTP:Legion-at-legion-elec.demon.co.uk]
> Sent:  Sunday, August 23, 1998 5:44 PM
> To:  tesla-at-pupman-dot-com
> Subject:  First light, and a poor performance
>
> Hi all,
>     Just fired up my new TC for the first time tonight, and
> unfortunately the output fell somewhat short of what I was expecting,
> I'd be very grateful if anyone could make a few suggestions about how to
> improve it.
>     The system specs are as follows.
>     Power supply, 11 kV (rms) polepig with resistive ballast made of 4Kw
> of heating elements filter consists of 2x20mH inductors and a 1.7nF
> bypass cap. Main tank capacitor is 7.42nF and the primary coil is a 30
> degree inverse conical with 12 turns of 1 mm wire 7 mm apart. The
> primary is spaced 20 mm from the secondary and the bottom turn of each
> coil line up. The gap is 6x0.5mm tungsten carbide static gaps.
>     The secondary is 4" dia and wound to 16.5" with 0.56mm enameled
> wire, there are around 660 turns giving an inductance of 11.4mH and a
> capacitance of around 8pF.
>
>     The system was run at first with no top load, tuning was around turn
> 6 and the maximum arc length to a grounded rod was 8", with a 4"
> spherical top load then the arcs reached 11".  When the system was run
> for any length of time, the nickel coating on the top load was etched
> through, and when the plastic underneath was burnt then the arc length
> decreased dramatically. Also it was found after a short while that the
> acrylic support structure of the gap had melted.
>
>     I am planning tomorrow to build a much better gap that can take the
> heat for longer and a finite element array toroid 14"x3". that should
> bring the system to 1/4 wave operation, and, I hope increase the output
> because from looking at other's coils, 11" from 4Kw seems very poor.
> If anyone else has any other suggestions for improving the system, I'd
> really like to hear them.
>
>
>                                         Steve
>
> --
> **********************************************************************
> *Stephen Rodway             Legion-at-Bigfoot-dot-com *  Support your local *
> *Tel. 0973 480 692                             *     coroner....     *
> *For Email use PGP where possible.             *    Die strangely!   *
> *http://www.legion-elec.demon.co.uk/index.htm  *                     *
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