Re: Coil Pictures :-)

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ajones18-at-bellsouth-dot-net>

 >Original poster: "Winston Krutsch by way of Terry Fritz
 ><twftesla-at-qwest-dot-net>" <u236-at-earthlink-dot-net>

 >Hi Malcom, Bart, All.

 >	Well, so it does :-)).  I was confused between John's formula, and
 >the report that someone had gotten 9 foot sparks out of the same two
 >xfmrs. I think the guy was using a huge cap (0.15 or larger) and a
 >SRSG.  The cap was around the resonant value (0.16 uF), I think.
 >Even with my 0.1 uF cap, the voltage would instantly rise to as high
 >a value as I dared to let it.  My system probably ran at a peak
 >firing voltage of 10-11 kV, for a 5 joule break size.

 >	Anyway, thanks for clearing up my error.  I feel better about my
 >coiling ability now ;-)).  4 kVA, and 10 foot (hopefully) sparks are
 >on the way :-))).

 >Have fun,
 >Winston K.

It was actually nearly 8 feet. Only needed one inch extra, but never
got it. Resonant cap size was .0795uF with 120v input to the
transformers. I did try .1015uF, but best performance was .09uF. The
variac was wired for 140v output to the transformers. I was using a
SRSG, 120bps, and could only achieve the 95 inch sparks with half-inch
wide copper stationary electrodes. Anything less and the spark length
dropped. See it at the link below.

Alan Jones
--
http://personalpages.bellsouth-dot-net/a/j/ajones18/SonotubeCoil.html