Re: A new mini-coil competition winner!

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Terry,

If his TC is running with Cp = Cres and the SG is set to 5KV, the BPS 
will be larger than 120.  Probably closer to 190.  BPS of 120 occurs 
with Cp around about 1.6*Cres (assuming he's getting a PF of 
0.5).  Computer simulations suggests that the PF may be more around 0.4

This would be a good coil to use a "Kill_A_Watt" meter on to measure 
the actual power draw, VA draw and associated PF.

Gerry R.

> Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>
>
> Hi Karl,
>
> Wow!!!
>
> The coil power is:
>
> 1/2 x 25nF x 5090^2 x 120BPS = 38.86W
>
> If 18.125 = F x SQRT(38.86)  Then F = 2.91!!
>
> But if we do the regular Freau equation:
>
> 1.7 x SQRT (0.038 x 5090) =  23.64 inches...
>
> So something is going on "I" don't understand.  Let me think on it %:-)
>
> Cheers,
>
>         Terry
>
>
> At 04:45 PM 6/6/2006, you wrote:
> > Hi Terry,
> >
> > I tried your test to make sure my gap did not widen from when I set 
> > it at 0.06" a few weeks ago.  I built the primary section first, 
> > and that test was one of the first I did then to accurately set the 
> > gap.  The gap fires smoothly with just the NST across it at a 
> > variac setting of 90% which is 108 VAC into the NST.  That should 
> > correspond to an output voltage of approximately 5090 VAC peak.  It 
> > does not look as if my gap is set too wide.  One of the rules of 
> > Gary's competition states that you may not run with a wide open 
> > gap.  I was careful to follow those rules to the letter in order to 
> > qualify, and to protect my little NST.
> >
> > Also, did you see any reason ScanTesla predicted only 6.4" streamers?
> > My earlier post contained the input and and output files I used in 
> > the program.
> >
> > Karl
> >
> > On Jun 6, 2006, at 5:38 PM, Tesla list wrote:
> >
> > > Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>
> > >
> > > Hi Karl,
> > >
> > > The resonant capacitor value for the modified transformer is:
> > >
> > > Cres = 0.038 / (2 x pi x 60 x 4000)  =  25.2nF
> > >
> > > so the 25nF capacitor in the coil is right at resonance.  Just 
> > > like an NST system, the voltage at the gap can be pretty high and 
> > > well over the rated voltage with a resonant size cap.  So instead 
> > > of the firing voltage being 5524V it might be much higher.  I 
> > > suspect it is closer to 15kV!
> > >
> > > There is an easy way to check.  Disconnect the cap and primary 
> > > coil so "only" the transformer and gap are in circuit.  With just 
> > > the gap as the load for the transformer, it should put out its rated voltage.
> > > Then see if the gap fires.  If it does, then the gap is set to 5524.
> > > However, if the gap does not fire and the electrodes need to be 
> > > moved closer, then the gap was set for a higher voltage.  Once the 
> > > gap is set for 5524V  I think the spark length will go way down 
> > > :-(  Like 7 to 10 inches.  So set the gap back to where it was :-))
> > >
> > > Cheers,
> > >
> > >         Terry