Hi Phillip, Phillip Slawinski wrote:
What can happen in a small rotary is that the electrode mechanical dwell time can become excessive, up to the point of the cap charging and discharging a time or two during the mechanical dwell. This can cause a problem with steady firing voltages and so it tends toward a chaotic voltage at each break. Actually, in this situation, it helps to have a bit larger gap to prevent these occurrences. But as the disc is larger in diameter, the dwell time reduces linearly. A 10" rotational diameter would have 1/2 the dwell time as a 5" rotational diameter. As the diameter of the disc is increased, it doesn't take long before a tight gap is ideal (as tight as is mechanically sound). It's simply another cool aspect to larger rotational diameters. Of course, the stresses on the disc increase with larger diameters, and another good reason to use G10 or G11 as an insulated disc (at least for hobby coils).On Sun, Nov 30, 2008 at 14:34, Jeff W. Parisse <workshop@xxxxxxxxxxxxx>wrote: What I meant is that I think the flying electrodes were too close together on the disc. My design had all the flying electrodes connected together by a ring, and the two stationary electrodes were in front of the disc 180 degrees apart. The flying electrodes were about 1.25" apart center to center.
Regards, Bart _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla