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Re: corona



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------- Forwarded Message Follows -------
From:          Self <Single-user mode>
To:            Dave Burman <dburman-at-ix-dot-netcom-dot-com>
Subject:       Re: corona (fwd)
Reply-to:      rwstephens-at-headwaters-dot-com
Date:          Sat, 8 Mar 1997 19:34:58 -0500

> Date:          Thu, 06 Mar 1997 08:27:56 -0700
> From:          Dave Burman <dburman-at-ix-dot-netcom-dot-com>
> To:            Tesla List <tesla-at-pupman-dot-com>
> Subject:       Re: corona (fwd)

> Tesla List wrote:
> > 
> > Malcolm Watts wrote:
> > >
> > > Hi Dave,
> > >           What is you primary capacitance, and what is the maximum
> > > straight-line spark you have measured from the unit please?
> > >
> > > Malcolm
> > >
> 
> > > >
> > > > My coil configuration is as follows:
> > > >
> > > > 2 15kva neons
> > > > 2 air wound and 2 ferrite core chokes
> > > > copper tube vacuum quenched spark gap (8 tubes, .030 spacing)
> > > > Primary -1/4" copper pipe with 3/8" spacing 12 turns
> > > > Secondary - 6" acrylic wound with 22" of 24ga magnet wire
> > > > Torroid - 4" dryer duct around a 24" pizza pan
> > > > ground - very heavy welding cable (1/2" dia) connected to 1 8' copper
> > > > plated ground rod
> > > >
> > > >
> Malcolm,	
> 
> My primary capacitor is a home rolled .019 uf.  Maximum strike distance
> is about 60"
> 
> Thanks
> 
> Dave

Dave,

Regardless of the fact stated that you have put some 30 kVA worth of 
neon transformers (sounds like a warehouse full) into powering your coil,
60 inches from a secondary with a 22 inch winding length is 2.7X, and that 
sounds like a winner to me! It takes true synergistic design (and 
some luck) to get a classical coil to such output length ratios.  I'm only pulling
your leg on the power thing. : )  You have made a small typographical 
error  in the way you described your neons.
Specs shud have been 15 kV, but we are all curious about
how many milliamps  each of the transformers are if you wouldn't mind.  If 
these are both 60 mA you are doing just fine.  If they are 30 mA, I 
want to suppress your design just like the alleged and infamous 200 
MPG carburetor.  Actually, all kidding aside, I know from the extreme 
limits of personal experience that 60 inches is achievable on a single 15 kV at 60
mA with good, total synergistic design.  A big component of such performance
figures relate to having, after you have everything else just right, an outstandingly
quenching gap.  Your gap sounds like just such a high performer, massive 
airflow through a large number of small gaps of large, smooth surface area, also 
employing fairly good thermal heatsinking abilities.

Good work!

rwstephens 






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