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Re: Sparklength inquiry
In a message dated 98-09-22 07:16:29 EDT, you write:
<< Awhile back, someone (perhaps Mark Rzeszotarski?)
> came up with a curve fit of power consumption vs
> coil scale. I remember that it seemed to fit the
> real-world data fairly well, and that it's baseline
> showed that coil power increases with the *square*
> of the coil dimensions.
Greg, all,
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 spark length toroid dia (inches)
680 W actual 42" 20
2100 W actual 65" 30
8400 W 134" 60
33.6kW 22' 120
67kW 31' 240
134kW 44' 480
538kW 88' 960
Your heat-in-the-arc core conservation theory sounds reasonable
to me.
John Freau
> If we assume that all coils under consideration are
> operated at their optimum BPS (to get BPS out of the
> equation) then arc length seems to be more directly
> related to output power, as the total arc volume must
> be super-heated in order to be an arc in the first place.
> Doubling the arclength should increase arc volume by 8,
> but the square/cube law may help to conserve heat in the
> core, possibly resulting in just a squared relationship.
> I tend to view the TC as a furnace in this way, and
> more *power* is necessary for more plasma.
--
Agreed, JF
> -GL >>