Original poster: "Peter Terren" <pterren@xxxxxxxxxxxx>
My coil has best performance at 1200BPS (9,000rpm, 8 electrodes) and
achieves 8 foot sparks, 3 times the secondary length.
The screaming jet philosophy works for me. Efficiency is difficult
to determine at >5kW at the time as I didn't have the true RMS
wattmeter that I have now. But that was a secondary consideration to
spark length. I am still not sure we really have a good idea of burst
frequency and length to get optimal spark growth.
Peter
http://tesladownunder.com/
Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>
...
Higher BPS doesn't offer as much energy per bang but since you're
firing more bangs per second, the total output power will still be
similar to the synch 120 BPS and the available power from the
transformer is the limiting factor. Many coilers note increased
spark length by increasing the BPS with an asynch driven coil,
within reason. Emperical research has shown that there isn't any
advantage by running BPS higher than 500 to 600 and the output
spark length actually begins to go down for a given input power
when BPS ranges are pushed beyond that. Besides that, very high
BPS rep rate is VERY hard on the primary capacitor ;^0
David Rieben