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Hi Other small effects favoring performance of the larger toroid is that the breakout point is ~1.5 inches further from the ground, ~1.5 inches closer to the ceiling, ~6 inches closer to the wall, and ~6.2 inches further from the strike rail. Matt D -----Original Message----- From: tesla-burst <tesla-burst@xxxxxxxxxx> To: 'Tesla Coil Mailing List' <tesla@xxxxxxxxxx> Sent: Thu, Jul 10, 2014 9:21 am Subject: Re: [TCML] Topload imperfections All, Derek wrote: >> Top loads will tend to break out at a voltage related to their >>minor diameter. >> Adding a breakout point will lower this breakout voltage, but I'm >> sure we have all tried a breakout that was too small, the reduction in >> breakout voltage can be aparently very small indeed I can get almost the same length of streamers both with and without a BP, but without needs 70 to 80% power on the variac before breakout, whereas with a BP (a 12 inch rod) this can be 40% (on synchronous 200bps) >>" We all try to make our toroids as smooth as possible and yet good >> results can be had from finite element toroids. >> To me, the above points to the field surrounding the torrioid >> smoothing out the "lumps", be it a small breakout, a screw head on the >> torroid or the coils of a finite element toroid." I too prefer a nice smooth one, but borrowing a 50 inch toroid that has regular construction joints around its edge, shows that completely smooth is not a necessity. The toroid in question can be seen here. http://www.hvtesla.com/images/upright.jpg Also Kevin E's BIGGG coil has streamers that glide nicely from one side to the other, despite its mesh construction, much like the toroid above is capable of doing, so I think it's only a sharp projection that we should avoid, which of course is nothing new as we all know. As for the field created, I tried showing the effect of two different toroid's fields (but on the same coil) on the streamer's behaviour. Not conclusive because a larger toroid diameter automatically moves the streamers further out anyway, but the video's second half, where the streamer's boundaries have been superimposed on the video alongside one another, clearly shows a difference. https://www.youtube.com/watch?v=y6PTwVnb1uo >> How smooth to top load need to be and is there a formulae that states that a >> sphere of diameter x on top of a sphere of diameter y as a combination, >> will break out at a particular voltage? Spheres will have a lot less effect surely - but probably more predictable. >> " Am I right that the field smooths out imperfections?" Yes, I beginning to think it does. Regards Phil Tuck www.hvtesla.com -- Web:www.extremeelectronics.co.uk <http://www.extremeelectronics.co.uk> Twitter @ExtElec <https://twitter.com/ExtElec> _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla _______________________________________________ Tesla-burst mailing list Tesla-burst@xxxxxxxxxxxxxxxxxx http://tedward.pupman.com/mailman/listinfo/tesla-burst _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla