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First light, and a poor performance
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From: bertpool-at-ticnet-dot-com [SMTP:bertpool-at-ticnet-dot-com]
Sent: Monday, August 24, 1998 4:54 AM
To: Tesla List
Subject: Re: First light, and a poor performance
Date forwarded: Sun, 23 Aug 1998 23:06:28 -0600
> 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! *
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>
>
Pole pig driven systems have an enormous amount of current which has to be
quenched - static gaps by themselves won't do it. You badly need a rotary gap
for this system.
Bert Pool