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Re: Advice on Secondary

Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>

i'd keep the 30" length and go for a 6" dia. secondary. with 22" you're prob gonna get alot of arcs to the strike rail, tho maybe not with a glass cap, which is gonna be lossy (due to corona and dielectric heating) and quite heavy. I once tried a gallon-sized pickle jar that worked fine for storing charges from a small vdg, but shattered when running after awhile in a 15/60 tc. Not sure if it was heat (glass was quite warm when i was picking up the shards or punch-through).

----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, January 19, 2005 8:45 PM
Subject: Advice on Secondary

Original poster: "Medina, Benjamin Alejandro (UMR-Student)" <bamxbb@xxxxxxx>


I am currently building a medium size Tesla Coil. Here are some of the

NST - 15kV/30ma

Capacitor- 5.37 nF made from glass plates with heavy duty aluminum foil
on the inside and outside faces

Primary- 0.25" of flexible copper tubing

Secondary- 22 AWG enamel magnetic wire on 4" diameter PVC. Height- ???

I am thinking on 30". I've read that for a medium size Tesla Coil an
aspect ratio of 4.5:1 up to 5:1 is recommended. But then again, there
are no hard/fast rules.

According to WinTesla, 4"x30" with 22A WG wire yields 1090.53 turns but
the Aspect Ratio is 30/4 = 7.5. Would this be a problem?? At first we
were going to go with 22" or 23" in height (22/4 = 5.5) (23/4 = 5.75)
giving us around 800 turns, but I read that 1000-1400 turns tends to
produce better performance than lesser turns.  The difference might be
10-20% spark length.

What do you recommend? Please advice. Your comments and suggestions will
be appreciated. Thank you.

Ben Medina