FW: Efficient Coil

From: 	Robert W. Stephens[SMTP:rwstephens-at-headwaters-dot-com]
Sent: 	Thursday, June 19, 1997 6:34 PM
To: 	Tesla List
Subject: 	Re: Efficient Coil

> From: 	davide-at-exit1.i-55-dot-com[SMTP:davide-at-exit1.i-55-dot-com]
> Sent: 	Wednesday, June 18, 1997 5:13 PM
> To: 	Tesla group
> Subject: 	Efficient Coil
> My son made a very efficient coil for his high school science teacher a
> few years back. Even though it was constructed rather poorly, it was
> able to produce 12 inch sparks from approximately 180 watts input. The
> power supply was a 6000 volt, 30ma. neon transformer. The primary
> capacitance consisted of 4, .01mf. 8,000 volt glass-tubed (mylar?) caps
> in series. The spark gap was just a single static gap with brass bolts
> set at approximately 1/8". The secondary winding length was around 12"
> long x 3" diameter on schedule 80 gray PVC. The primary was a flat
> spiral type with 6 turns of 12 gauge copper wire, tapped at the fourth
> turn. The terminal capacitance was a oblate from a brass chandelier. 
> The spark length was measured by a ruler held up to the output
> terminal.  This would seem to better the 200 watt per foot of spark
> length by 10%.
> Dave Euans

That does indeed sound like quite an efficient TC.  Good for your 
son!  If those caps *were* mylar, going to a good poly pulse cap 
would probably increase the output performance even further.