Re: Coil Pictures :-)

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

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.


Tesla list wrote:
 >
 > Original poster: "Barton B. Anderson by way of Terry Fritz 
<twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>
 >
 > Hi Winston,
 >
 > Tesla list wrote:
 >
 > >Original poster: "Malcolm Watts by way of Terry Fritz
 > ><twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>
 > > >     The system was my old 6" cobble up, running a 0.1 uF cap, 46 uH
 > > > primary, and a 60 mH 1300 turn secondary with 20 pF of top capacitance.
 > > > The Fres was about 110 kHz.  It was running at 1800VA from two seriesed
 > > > H&R xfmrs (2700V -at- 330 mA).  John's formula predicts a 9 foot spark
 > > > here, so my five footers aren't very impressive.
 > >
 > >Does it?  I get 6' from the formula I remember which sounds about
 > >right at that power level.
 >
 > Yep, concur with Malcolm. 1800VA is about 6 feet (1.7 * sqrt(1800)).
 > So the system was doing well.
 > Bart