RSG Question

From:  D.C. Cox [SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent:  Tuesday, June 16, 1998 6:45 PM
To:  Tesla List
Subject:  Re: RSG Question

to: Greg

With non-snychro gaps, pole xmfr drive, and cap values from .04 to 0.2 MFD
a break rate of 450-480 pps seems to work best.  Higher rates work well
with magnifiers but not classic coils with coeff. coupling in 0.18 to 0.2


> From:  FutureT-at-aol-dot-com [SMTP:FutureT-at-aol-dot-com]
> Sent:  Monday, June 15, 1998 8:56 AM
> To:  tesla-at-pupman-dot-com
> Subject:  Re: RSG Question
> In a message dated 98-06-14 02:12:26 EDT, you write:
> << ----------
>  From:  Gregory R. Hunter [SMTP:ghunter-at-enterprise-dot-net]
>  Sent:  Saturday, June 13, 1998 1:59 PM
>  To:  'Tesla List'
>  Subject:  RSG Question
>  Dear List,
> > Ever since I saw an RSG in operation at the UK Teslathon, I've been
> >contemplating building my first RSG.  I'm curious though, about the
> > relationship between optimum tank cap value and RSG break rate.
> > Instinct tells me that at high or very high break rates, the tank
> > capacitor must be smaller than one optimized for a static gap
> > system.  Does anyone have a rule or formula for selecting best
> >cap size based on both power supply and RSG break rate?
>  Greg
>  Suffolk, UK
>   >>
> Greg,
> The basic rule is that if you double your break rate, you should use
> half as much capacitance, for the same input power.  A static gap
> will automatically adjust its break rate based on the cap size and
> power available...provided the quenching is good.  Using the rotary
> gap, if you increase your break rate, without providing more power 
> input, the caps will charge to a lower voltage.  Either a static
> or a rotary can have a high or a low break rate. 
> I used to like high break rates and small capacitors, but I now 
> prefer low break rates and larger capacitors for a given power 
> input.  With high break rates the sparks will be brighter, and more
> frantic in motion.  Low break rates will produce dimmer, slowly
> floating, longer sparks IMO.  However what I just said seems to only
> be true at relatively low power levels.  At higher powers, the frantic
> motion may not develop, even at faster break rates.  And this may
> be affected by toroid size or other factors perhaps.  So there seems
> to be a few mysteries *out there*.
> I suspect that a low break rate with a large cap will give longer
> sparks even at high powers, but I don't have the room to do the
> tests.  Perhaps someone on the list will do these kinds of 
> comparisons to help settle the matter. 
> Have fun, but safety first,
> John Freau