Re: what's wrong with my coil?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Gregory Hunter by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ghunter31014-at-yahoo-dot-com>

You're right--it should be doing better with that much
input power. My first suspect is your ground system.
Have you tried a real outdoor ground rod? Even a 4
foot Radio Shack mini-rod would be preferable to your
foil plane. Second suspect is that TCBOR multi-gap.
Try a single static gap with some serious air blast or
else a hollow electrode (Gary Lau style) "sucker gap".
You can see examples of the sucker gap on Gary Lau's
site or my site.

Regards,

Greg
http://hot-streamer-dot-com/greg

--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "Robert by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <obiwan1186-at-sunflower-dot-com>
> 
> I don't think i'm getting the performance i should
> out of my coil. here 
> are the specs
> Primary - flat spiral with x number of turns where x
> depends on what 
> topload i'm using, 8.5" ID, quarter inch copper
> tubing spaced a quarter 
> inch between turns.
> secondary - 4.5" diameter, 23 inches high, 22 gauge
> wire on a pvc form 
> sealed with polyurethane (smooth as glass)
> spark gap. RQ/TCBOR gap hooked up to my shop vac.
> capacitor - LTR geek mmc bank.
> topload - 4" dryer ducting bent around 2-10" pie
> pans and covered in 
> aluminum tape.
> secondary is grounded in my garage to a large array
> of aluminum foil 
> sheets.
> coupling is pretty good, since the base of the
> secondary is about 2 
> inches underneath the primary with no racing sparks,
> any farther under 
> and i get racing sparks, so it's just about as
> coupled as it can get.
> input power is 1.35kva (9/150) and the spark length
> is only about 2.5 to 
> 3 feet at most. the arcs aren't even that hot
> either. i've seen coils 
> that get 4 foot arcs using just a 12/60. is there
> anything i can do to 
> improve spark length (besides upgrading to Marc's
> trigger gap, which I 
> am currently working on). thanks a lot,
> Robert
> 
> 
> 


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