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Re: Real data from real experiments.

Tesla List wrote:
> 
> > Subject: Re: Real data from real experiments.
> 
> >From hullr-at-whitlock-dot-comMon Nov 11 23:00:36 1996
> Date: Mon, 11 Nov 1996 16:11:05 -0800
> From: Richard Hull <hullr-at-whitlock-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: Real data from real experiments.
> 
> Tesla List wrote:
> >
> > >From MALCOLM-at-directorate.wnp.ac.nzSun Nov 10 21:43:05 1996
> > Date: Mon, 11 Nov 1996 10:51:14 +1200
> > From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
> > To: tesla-at-pupman-dot-com
> > Subject: Re: Real data from real experiments.
> >
> > Brent,
> >        There is an even better reason to use high Vcap, low-C in a
> > primary....
> >
> > <masssive snip>
> > > No charge is actually 'lost' - rather, it is simply re-distributed.
> > > The total stored potential energy is reduced though, according to the
> > > square of the voltage. Seems to me that this is exactly the reason why
> > > we use small value capacitors with a heaping amount of very high voltage
> > > in the primary circuit!
> >
> > Example : let bang size = E, cap = C, primary = L. Surge impedance =
> > SQRT(L/C), peak current inversely proportional to surge impedance
> > and gap loss proportional to Ipk.
> >
> > Let's double our surge impedance by halving C and doubling L (same
> > frequency) and keep bang size up by increasing voltage to compensate
> > for a drop in C.
> > We now have Z surge = 2x original, V = SQRT2 x original voltage (keep
> > E constant) giving current decreased by SQRT2, gap losses therefore
> > reduced by SQRT2.
> >     Okay, this all needs the appropriate calculus done to truly
> > quantify peak values etc. but I think you can see the benefit
> > attainable.
> >
> > Think I got that all right but stand to be corrected as usual,
> > Malcolm
> 
> Malcolm,
> 
> I have long known and harped that the high L low C coil outperformed
> other systems with the reverse set of parameters, but your explaination
> is quite good and insightful.
> 
> Richard Hull, TCBOR

Richard/Malcom:
	I hope I am not repeating a question already asked,but here goes.  Is
there a way you could suggest to select the best size cap for a given
set of coil parameters?
I have that new PVC form I mentioned and I am ready to start the primary
component selection and construction.  The primary is a piece of 15 1/4"
O.D. PVC and the coil will be 50" of #15 wire, or 831 turns. Primary was
going to be 5/8" thin wall copper tube.  I was considering a .1 mfd cap,
but I really do not have a feel for what exactly the primary L/C ratio
should be for optimum spark.  Your comments woud be appreciated.  Thanks

Chuck Curran