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RE: what's wrong with my coil?



Original poster: "Ted Rosenberg by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Ted.Rosenberg-at-radioshack-dot-com>

Robert:
My first coil used a 15/60 with a NON LTR static gap (.0117µF). The best it
did was 2.5-3 foot streamers.
Now, with a slightly longer secondary (about 20% more turns on a 6" form)
and an LTR MMC (.028µF) and the t-gap, I get consistent 3.5-4 foot
streamers. A larger, smooth, toroid seems to also help maximize the output
into one arc as opposed to many smaller arcs/streamers. Same NST!

Safety First

Ted

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Friday, November 02, 2001 7:25 PM
To: tesla-at-pupman-dot-com
Subject: what's wrong with my coil?


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