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Re: Capacitor Size and BPS



Original poster: "Peter Terren" <pterren@xxxxxxxxxxxx>

For my high BPS coil, I used 4 series MOT's under oil probably saturating with variac up high (or full). 1280 turns in 32 inches 6 inch diam. Note the cap is across the transformer, not the gap, unlike most people. Cap was part CD MMC and part rolled cap to total 92nF. Topload was double and big.

I think it worked well because of the fast bps and big double top load to prevent primary strikes.
Details are here.
http://tesladownunder.com/tesla_coil_6inch.htm

Peter

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
Hi Peter,
I've always been interested in these high bps achievements. Could you send me some basic specs on your coil setup? I would just like to know the transformer and cap specs if it's not too much trouble (I assume the coil is 32" length or near?).

I agree with your last statement. The burst rate and it's affect on growth with comparison to input power may allow for other tradeoffs (like longer sparklengths with smaller cap size). Just curious on the specs if you have them.

Take care,
Bart

Tesla list wrote:
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