Test: Bigger Secondary gives Bigger Sparks

• To: tesla-at-pupman-dot-com
• Subject: Test: Bigger Secondary gives Bigger Sparks
• From: FutureT-at-aol-dot-com (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sun, 12 Sep 1999 22:38:01 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

All,

Recently I posted my results from a small TC with a 3" by 12" 
secondary which gave 14" sparks using a 7.5kV, 30ma NST,
120bps sync rotary gap, 13.3nF cap, and 3" x 10" toroid.   The
#12 wire primary was tapped at 6.5 turns.  A nice mini-TC.

I removed the small secondary and installed a larger 4.2" by 23" 
secondary also wound with #28 wire.  I retuned at 18 turns on
the primary as needed.  All else remained the same, but the
spark increased to 22" for a 57% increase.

Other things that automatically changed; greater primary inductance
and surge impedance, greater secondary inductance and Cself,
lower frequency, no racing sparks.  It is not known how much each
factor contributes to the 57% spark length improvement.  

It is intriquing to consider that perhaps the spark lengths of many
other TC's could be easily but greatly improved, simply by installing
a larger secondary with greater inductance, and retuning as needed.

Cheers,
John Freau

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