# RSG Question

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From:  Julian Green [SMTP:julian-at-kbss.bt.co.uk]
Sent:  Thursday, June 18, 1998 9:02 AM
To:  tesla-at-pupman-dot-com
Subject:  Re: RSG Question

> From:  Gregory R. Hunter [SMTP:ghunter-at-enterprise-dot-net]
> Sent:  Monday, June 15, 1998 4:17 PM
> To:  'Tesla List'
> Subject:  RE: RSG Question
>
> Julian,
>
> At the Teslathon I was fascinated by your RSG.  I had always assumed that constructing an RSG required the skills of a machinist plus a big bankroll, so I was reluctant to make one.  However, your gap was so simple & efficient I've begun to think perhaps I can build one after all.
>
> I'm curious about the size of your tank capacitor.  If you're running 14 Amps at 240VAC, that corresponds to 305ma at 11KV.  According to Wintes3.1, you need .088uf to impedance match that at 50Hz.  Were you using .088uF?  I thought your cap was smaller than that.  That's what I'm getting at.  Does the RSG somehow allow the system to process more power with less cap?
>
> Cheers,
>
> Greg
> Suffolk, UK
>

Yes by increasing the number of gap firings per mains cycle. The values
of 0.88uF was calculated assuming two gap firings per main cycle.

The tank cap is 0.03uF.   The rotary cap closes roughly 6 times per mains
cycle (50Hz).   There are two stationary electrodes and two rotating
electrodes.   The electrodes align every half revolution.

6*50 = 300 BPS
300/2=150 Revs per second or 9000RPM.

The electrodes are 1/8" diameter
The electrodes rotate on a 6" diameter wheel
Electrode velocity: 2826 inches per second
Time electrodes are aligned 44uS

The coil does not need balasting - the resistance of the main wiring
is enough.

Why does the current meter read a relativly constant current if I
adjust the RSG speed by a factor of 2.  If I run the spark gap too
slow then I get serious kick back problems and blowen fuses.  Is my
spark gap mechanically quenching and limiting the current?

If I use a RQ type spark gap on my pole pig then I get kick back
problems and more blown fuses.

Julian Green

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