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Re: [TCML] 5" Sparks - Approx 35 watts input power: Tesla was correct!

Hi John,

Karl's report of 18.125" exceeds the formula by 1". So, small coils can do well. Wait, I'm assuming a small coil. Any specs on Karl's coil? The contest is about small power, not necessarily a small coil.

Lau, Gary wrote:
Hi John,

My minicoil contest rules and results are at http://www.laushaus.com/tesla/minicoilcontest/index.htm

Using a partially deshunted 4/20 NST to yield 38mA Isc, Karl Lindheimer reports getting up to 18.125".  I once achieved 16", but haven't been able to do any better.  But the secret does appear to lie in going large with top load and pri/sec inductors.

FWIW, my mini coil NST pulls 1.75Amps @120V from the wall with no PFC.  Not certain if this included the microwave oven fan for the spark gap, but that shouldn't account for much.

Regards, Gary Lau

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf Of FutureT@xxxxxxx
Sent: Wednesday, March 12, 2008 10:12 PM
To: tesla@xxxxxxxxxx
Subject: Re: [TCML] 5" Sparks - Approx 35 watts input power: Tesla was correct!

Bart, Gary,

Well now that you mention that, do you happen to remember
what the results were for the best small coils in Gary's small coil  contest?
I don't remember if those coil's performances met my formula or not.
Maybe Gary can give some info here.

When I built my TT-32 coil, it only gave 27" sparks instead of the
32" I expected.  It was built very similar to the TT-42 coil, but was
smaller and used less power.  The results were below what my
formula would expect.  It's possible there were higher losses in
the particular transformer I used, or something similar.  I  didn't
really look into that.  Maybe it wasn't really missing the mark
by a full 5".  Maybe it only missed by 2" or so.  I've have to  check
my notes.  This happens to be one of the things which is clearly
annotated in my notes ( I think ).  The operating voltage was  lower,
and that may contribute to under-performance.  So yes,
there is hope for the small coils, that they may properly  obey the formula,
if they are built carefully enough.


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