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>" <FutureT-at-aol-dot-com>

In a message dated 6/13/01 7:13:54 PM Eastern Daylight Time, tesla-at-pupman-dot-com 
writes:

David,

I don't think it's so much the sync or async that makes much 
difference, but rather the breakrate.  I've found better "efficiency"
at low breakrates.  It's easier to get a coil to run smoothly using
sync at a low breakrate, because of the effect of the 60Hz AC.
In a filtered DC TC, sync or async has no meaning.  The real
question is whether a low bps is better or not.  In the low powered
work I've done, low bps was better.  I don't see why this wouldn't
apply at higher powers also.  As the bps is lowered, the cap
size needs to be increased to keep the input power the same
(or the voltage needs to be raised).  Kevin's coil is running at
120 bps sync, but he's getting a lot of loss in his ballast, so it
would be interesting to see how efficient it would be with a better
ballast.

Cheers,
John
--

> 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