Re: my power supply was: pt-coil caps/too many?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Bart Anderson <classi6-at-classictesla-dot-com> 

Hi Adam,

Tesla list wrote:

>Original poster: Beans45601-at-aol-dot-com
> >
> > On my new coil, my secondary will be a 10" sonotube, wrapped
> > 1440 times
> > with 20 gauge wire (50 inches of turns). The spark gap is a
> > 3450 RPM. 6"
> > disc with 8 flying electrodes. MY toroid is a 9X30 spun toroid and my
> > primary will be 12" inner diameter, with 18 turns. The cap
> > bank will be 5
> > strings of 16 geek group caps, for a total of .0458UF. Is
> > this too much
> > capacitance? If not, what would be considered too much, with
> > the coil I am
> > building?
>
>i will be running it with a 14.4 KV 1.5KVA PT.
>
>Will this be enough?

The supply is small for a 10" coil and .0458uF cap size. More below to follow.

(extracted a portion of Javatc output)
----------------------------------------------------
Rotary Spark Gap Inputs:
1 = Number of Stationary Gaps
8 = Number of Rotating Electrodes
3450 [rpm] = Disc RPM
0.25 = Rotating Electrode Diameter
0.25 = Stationary Electrode Diameter
6 = Rotating Path Diameter

----------------------------------------------------
Rotary Spark Gap Outputs (noting ***):
8 = Presentations Per Revolution
460 [BPS] = Breaks Per Second
61.6 [mph] = Rotational Speed
2.17 [ms] = RSG Firing Rate
31.659 [ms] = Time for Capacitor to Fully Charge
0.34 = Time Constant at Gap Conduction
0.46 [ms] = Electrode Mechanical Dwell Time
29.06 [%] = Percent Cap Charged at Gap Conduction ***
5917 [volts] = Effective Cap Voltage ***
0.8 [joules] = Effective Cap Energy ***
175258 [volts] = Terminal Voltage ***
369 [joule*seconds] = Cap Energy per Second ***
60.3 [inch] = RSG Spark Length ***

----------------------------------------------------
Now, if we drop the tank capacitance down to .02uF:

8 = Presentations Per Revolution
460 [BPS] = Breaks Per Second
61.6 [mph] = Rotational Speed
2.17 [ms] = RSG Firing Rate
13.825 [ms] = Time for Capacitor to Fully Charge
0.79 = Time Constant at Gap Conduction
0.46 [ms] = Electrode Mechanical Dwell Time
54.44 [%] = Percent Cap Charged at Gap Conduction ***
11086 [volts] = Effective Cap Voltage ***
1.23 [joules] = Effective Cap Energy ***
216979 [volts] = Terminal Voltage ***
565 [joule*seconds] = Cap Energy per Second ***
65.4 [inch] = RSG Spark Length ***

----------------------------------------------------
Ok, let's drop BPS using only 4 rotating electrodes (noting ***):

4 = Presentations Per Revolution
230 [BPS] = Breaks Per Second ***
61.6 [mph] = Rotational Speed
4.35 [ms] = RSG Firing Rate
13.825 [ms] = Time for Capacitor to Fully Charge
1.57 = Time Constant at Gap Conduction
0.46 [ms] = Electrode Mechanical Dwell Time
79.25 [%] = Percent Cap Charged at Gap Conduction ***
16136 [volts] = Effective Cap Voltage ***
2.6 [joules] = Effective Cap Energy ***
315826 [volts] = Terminal Voltage ***
599 [joule*seconds] = Cap Energy per Second ***
66.2 [inch] = RSG Spark Length ***

----------------------------------------------------
Finally, let's drop BPS using 2 rotating electrodes (noting ***):

2 = Presentations Per Revolution
115 [BPS] = Breaks Per Second
61.6 [mph] = Rotational Speed
8.7 [ms] = RSG Firing Rate
13.825 [ms] = Time for Capacitor to Fully Charge
3.14 = Time Constant at Gap Conduction
0.46 [ms] = Electrode Mechanical Dwell Time
95.69 [%] = Percent Cap Charged at Gap Conduction ***
19485 [volts] = Effective Cap Voltage ***
3.8 [joules] = Effective Cap Energy ***
381370 [volts] = Terminal Voltage ***
437 [joule*seconds] = Cap Energy per Second ***
62.2 [inch] = RSG Spark Length ***

I din't "optimize" anything here, just showing some relationships with 
energy throughput which you may want to consider. Once you define or 
optimize what you think is a good setup, then just build a primary to suit 
the complete resonator. Also note, the .0485uF cap will work (as long as 
the rotary gap is set narrow).

Hope this helps a little.
Take care,
Bart