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Re: Sparklength inquiry
Hi Greg, all,
> Original Poster: Greg Leyh <lod-at-pacbell-dot-net>
>
> > Original Poster: FutureT-at-aol-dot-com
>
> > I posted the square law suggestion some time ago, based on my
> > results with the sync gap coils in which I obtained 42" sparks using
> > 620 watts, and 64" sparks using 1570 watts. I was relating input
> > power to spark length. I then scaled up the spark lengths using the
> > square law, and your 25' spark TC fit well on the curve. This
> > posting was before I improved the efficiency of my coils, the old
> > figures were:
> >
> Power input (revised) spark length toroid dia (inches)
> > 680 W 620W actual 42" 20
> > 2100 W 1570W actual 64" 30
> > 8400 W 6280W 128" 60
> > 33.6kW 25kW 21' 120
> > 67kW 31' 240
> > 134kW 100kW 42' 480
> > 538kW 400kW 84' 960
> > 1.6MW 168' 1920
> > ***new** 5.1MW 300'
>
> > I noted in my posting above that this chart was created before I
> > improved the efficiency of my coils. I added a new column in the
> > chart above, and plugged in the values for my present efficiency
> > of my coils (see chart). Using these new values, I show a need
> > for only 5.1MW to develop the 300 foot spark, which by coincidence(?)
> > agrees exactly with your figure.
> >
> > John Freau
>
> Here's another correlating datapoint for your curve --
> At the NZ site, Electrum produced a 40 - 45ft ground strike
> (observed 3 times) with 109kVA on the main transformers.
> There's this one particular plant (called a 'flux' plant?!)
> that seems to attract strikes, when the wind is right.
Flax actually. Long spiky leaves?
> My two coils land pretty close to the square-law curve
> that is defined by your two coils.
> And Ed's halfwave coil lands fairly close as well, beating
> the revised curve by about 20%. But a halfwave coil should
> be more efficient at producing spark length -- since the spark
> channel is supported at both ends, the ends of the spark need
> be only as thick as the base of a single spark half its size.
And also a higher voltage between the terminals (by about SQRT2) due
to energy sharing. I got the same sort of result for my minicoil twin.
Malcolm
> So with 5 data points that span over 7 octaves of power,
> it would seem that a simple square-law is a good fit.
>
> Can it be that easy? Here's where a good survey would
> come in useful.
> --
>
>
> -GL
> www.lod-dot-org
>
>
>
>