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Re: [TCML] LTR/STR and spark length
Hi Neal,
With a 9/180 supply, you should be doing much better than 18" sparks. I
have to assume spark gap losses are a large reason why you are not. I
don't know any details of your static gap but I have to assume it's
running an extremely high bps as the gap is set narrow to due the 9kV
output.
The sphere should have done better than the small toroid you described.
But, a larger toroid in the 5" x 20" range would double the top
capacitance beyond that of the sphere and also add a couple more turns
on the primary and do even better. It would be nice if you could upgrade
the cap bank to 70 or 80nF and run LTR. You might want to start heading
towards an SRSG upgrade if you can get a cap size up there. Both cap and
rsg upgrades can get expensive and I know it's easier said than done.
The larger secondary looks real nice! This should be a nice coil but it
will require all new components and all the same upgrades.
Take care,
Bart
Neal Namowicz wrote:
First, I'd like to thank Gary Lau on the previous advice you gave me re: resonance and capacitance. If you'll recall, I started out with a 2nf cap bank, bumped it up to 4, and then after I was told that was significantly str I managed to bump it up to 25 nf. (I had more caps laying around than I realized).
Here's my question- how much is one's potential spark length limited by the height of the secondary? Here's basically what I have; 4" x 18" secondary, flat spiral primary using .25" cu tube, and I changed to a 9kv, 180ma power supply. I've tried various toploads, and I've found that I'm still partial to the sphere shape. I tried a dryer duct toroid that ended up being just slightly wider than the secondary is high, and had good arcs breaking out all over at 18"+ . Then I went back to a 10" sphere with a 12" brass rod stuck into a hole in the sphere. I'm getting easy 18 to 20" streamers off the top. Given that I'd like to stick to my quenched single static gap (for now, at least), can I expect to get any better, or is it time to "upgrade" to a bigger secondary? A long time ago I started a bigger coil, but didn't get any farther than winding the secondary (8"x48", wound with 18 ga). Thanks everyone, for your help and input.
Neal.
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