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*To*: tesla-at-pupman-dot-com*Subject*: Re: RSG material?*From*: Hollmike-at-aol-dot-com (by way of Terry Fritz <twftesla-at-uswest-dot-net>)*Date*: Fri, 15 Sep 2000 23:46:42 -0600*Delivered-To*: fixup-tesla-at-pupman-dot-com-at-fixme

In a message dated 9/15/2000 8:30:43 PM Mountain Daylight Time, tesla-at-pupman-dot-com writes: > > I've also seen static gaps used in series with the RSG.. what's the > point? ;) Seems like the motion of the flying electrode would quench > the gap reasonably quickly. I get the feeling I'm missing a crucial > detail here..... > I am not a mathematician(but am gonna try anyway), but the dwell time is probably much longer than you'd think. If you take a 1 foot diameter disk(i.e. the center of the electrodes are 6 inches from the axis of rotation) and it is spinning at 60Hz(377 radians per second), the electrode, if I did the math correctly, is moving at about 2262 inches per second(someone should check this for me). If the electrodes are 1/4 diameter, the time it takes for the moving electrode to pass the stationary electrode is 0.5/2262 or .22 msec. This is assuming the spark initiates at the moment the leading edge of the moving electrode meets the edge of the stationary electrode and can conduct until the trailing edge of the electrode has passed the stationary one(0.5 inches of travel). Now, assuming your coil operates at, say 180kHz, It can oscillate 30 times(about enough to decay to near zero volts) in 0.166667msec. In other words, the whole decay has happened before the electrodes can quench the arc. At higher TC frequencies, the situation is even worse. I imagine that most coilers space the stationary electrodes at a sufficient distance to alter the 'real' dwell time to allow quenching of the arc, but some use a static gap in conjuction with a rotary to cause much of the voltage drop to occur through the static gaps. This will not allow the arc in the rotary gaps to 'stretch' from the inductance as much and helps shorten the effective dwell time. Hopefully, I did this all right :o) comments? corrections? Mike

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