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Registered Member #2566
Joined: Wed Dec 23 2009, 05:52PM
Location:
Posts: 147
Impressive coil Phillip.With bigger toroid the longest spark might be even 20' I think. BTW,what input power was sufficient for 17' ?
Steve Ward wrote ...
Also noticing the 16 footers are much dimmer than the ground strikes. I do wonder how much the resistance of the brick post matters, or if its simply reaching the impedance of the arc that limits the discharge current, and hence brightness. Id have to think a bigger toroid might "fix" that.
Maybe,next time running, he should place aluminium ladder 16 ft. away to observe difference? Scoping primary current during the strikes could be insightful as well.
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Very impressive run, Your secondary parameters are near identical to my big coil so it's interesting to see it run with a low impedance tank. From your impressive output I'm assuming you are running close to 2KApk or more? I have noticed that the lower impedance systems seem to get a bit hotter in the primary, water cooling should suite it well.
Interesting though to note that two coils with near identical secondary specs can get optimal performance with ether a low or high impedance primary configuration.
Registered Member #1732
Joined: Thu Oct 02 2008, 02:34PM
Location: Huntsville, AL
Posts: 112
Goodchild wrote ...
Very impressive run, Your secondary parameters are near identical to my big coil so it's interesting to see it run with a low impedance tank. From your impressive output I'm assuming you are running close to 2KApk or more? I have noticed that the lower impedance systems seem to get a bit hotter in the primary, water cooling should suite it well.
Interesting though to note that two coils with near identical secondary specs can get optimal performance with ether a low or high impedance primary configuration.
Great build, can't wait to see more.
I haven't been able to measure primary current, but I'd be surprised if the peak current in the primary was under 2kA. I do have the current limiter set at 3KA, and I've never hit that, so it must be under 3kA peak (or the current limiter is broken ) I would blame the heat on the high RMS currents, which should be somewhere in the neighborhood of 300A.
I tried a higher impedance tank to start with (tank C = 0.75µF) the results were not what I had hoped, so I ended up adding two strings to that to arrive at the 1.25µF that I run now.
Very impressive coil. The construction is excellent and the length and heat in those sparks would put most pig powered coils to shame (mine included :() Nice work!
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DRSSTC VI
) I would blame the heat on the high RMS currents, which should be somewhere in the neighborhood of 300A.