Coil Doesn't Fire 2

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

Original poster: JBarrett-at-trumbullcorp-dot-com 

Hey Guys,
This past weekend I experimented with many of the suggestions everyone 
posted but my coil is still DOA. Some of the things I tried include:
1-Adjusted Spark Gap from 1/8" and wider until gap would not fire.
Result: Minimal improvement.

2- Move the primary tap around in 1/4" increments.
Result: Works best at about 12.5 turns or greater

3-Move primary higher up around the coil from more overlap.
Result: Made things worse. Almost no spark.

4-Rewound primary so the inner radius was 1" away from secondary.
Result: Made things worse.

I really believe the biggest problem is the caps are way to small. The 
spreadsheet I used for my calcs shows a 0.007uf Cap is best and I'm at 
0.006uf. I think that I don't have a good understanding of this aspect of 
design.

Another response I received delt with coupling of the coil. Here too I 
could use some input.

Finally I am going to take everybody's advice and build another cap bank 
with either Panisonic or CD 942's. Additionally I plan to build a static 
spark gap with copper pipes.
Thanks Guys for the info. KEEP IT COMING!
Jim
 >Transformer:
 >12,000 Volt 30 ma>
 >Caps
 >Panasonic ECW-H 0.0043uf +- 3% W.V. 1500 VP-P 2500 VDC with a 10 megaohm
 >bleeder resistor across each cap. 8 in series 12 parallel.>
 >Secondary
 >21" of 22 guage wire on a 4 1/2 inch PVC Pipe
 >
 >Primary
 >14 turns of 3/8 copper tubing mounted on 3/4 inch plastic risers set at 30
 >degrees. The inner Diameter is 5 1/2inches.
 >
 >Torid
 >22 inch major Diameter of 4 inch flexible dryer duct mounted on aluminum foil
 >covered 1/4 inch plywood.
 >
 >Spark Gap
 >Air cooled at 25 psi
 >
 >Grounding
 >2- 4 foot ground rods driven into ground and soaked with h2o.