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

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.
> Cheers,
> John

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