Thanks for the tip DC!On my little 4" coil I had built it so that the secondary windings started at the same elevation as the secondary coil. Can't say why I did that now, but probably(maybe?) had a
reason at the time.Anyway, just did some testing by raising the secondary up 3/4" and I could tell the difference right away. With my gap set at 1/4" and the sucker-gap vacuum running about half speed it now chugs along nicely, better than before. I think I'm at the limit of what i can pull from the wall outlet. My meter shows bouncing around 15Amps and I don't have any power factor caps. I guess that and a bigger variac will be my next equipment purchases. I've got a 60Amp 230 drop for my welder that I could tap into. Then I can move all my gear up to a larger coil! Already started collecting parts.
CP8071----- Original Message ----- From: "DC Cox" <resonance@xxxxxxxxxxxx>
<clip> With an 8 inch dia sec you need to experiment with sec elevation above the horizontal pri plane. Usually around 3.75 to 4 inches with 1.25 pri-sec spacing works good. Again, with an 18 inch dia inductor the verticalspacing works best with 6.75 inches and 9 inches is required for any 24 inch dia sec. I discovered years ago this relationship is a near linear functionboth upwards and downwards. I did a lot of experiments with various size coils using a large brass ead-screw setup to actually raise the sec up anddown while it was running. I was quite surprised how high the sec needs tobe elevated to achieve maximum spark length. You can experiment with your setup using 1/2 - 3/4" chunks of plywood to raise the sec small increments at a time. <clip> Dr. Resonance
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