Re: need suggestions for general sizing in a multi coil setup

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Esondrmn-at-aol-dot-com>

In a message dated 6/13/01 4:14:01 PM Pacific Daylight Time, tesla-at-pupman-dot-com 
writes:

David,

When I was using the asnychronous rotary gap, the coil performed well but did 
not run very smoothly - kind of hard to describe - large primary voltage and 
current fluctuations and occassional popping sounds from the rotary gap.  I 
use a .05 ufd primary cap.  It did like high break rates, the higher the 
better the performance.

It runs much smoother - sounds happier, you know - with the synchronous gap.  
It is nice to be able to dial in either 120 or 240 bps with John's phase 
control system.  With the coupling set as it is, I believe it is very close 
to damaging the secondary at 120 bps, so I run it at 240 bps when applying 
full power.  The blue corona field that you can see from the top of the 
secondary down to the primary gets very intense at 120 bps.  I need to loosen 
the coupling some day and do some full power tests at 120 bps - maybe even 
add some additional primary capacitance.

Ed Sonderman

<< 
 > I have a coil about the same size.  I use two toroids, the lower one is 
30" 
 > x 
 > 6" and the upper toroid is 40" x 6".  I have a 5kva 14,400 volt 
transformer 
 > that I run at about 7 - 8 kva.  The coil produces 104" sparks.  This was 
 > with 
 > both an async gap running at about 300 to 500 bps and the new sync rotary 
 > running at 240 pbs.  You can see pictures at my web site: 
 > http://members.aol-dot-com/esondrmn/index.html 
 >
 > Ed Sonderman 
 >
 >
 
 
 
 Hi Ed, Jim, all, 
 
 You know, I wonder if this isn't the case with most or all 
 pole pig systems. I think someone else? may have men- 
 tioned that with a pole pig type transformer, it dosen't seem 
 to make much difference in the output spark length, whe- 
 ther the RSG is synch or asynch (assuming a reasonable 
 bps rate for the asynch vs. the cap's size). I can't personal- 
 ly speak about synch systems as I've only had experience 
 with asynch with my pole pig system. I think Kevin Eldredge 
 in OK runs his huge 24' sparker synch at 20 kVA input, but I 
 don't know if he tried asynch first? It would be intersting to 
 try building two  pole pig sytems identical to each other in 
 every respect, except for one being synch RSG and the other 
 being asynch RSG, and to compare the difference in the out- 
 puts, if any. I don't have the facilities (and money) to try this 
 myself but maybe some better equipped and financed list 
 member(s) could work on this? How about it Geek Group :-)? 
 I would personnaly be interested in the outcome of such a test. 
 
 Sparkin' in Memphis, 
 David Rieben 
 
 PS - My apologies if someone else has already tried this.
  >>