Re: Practical limit to number of turns on primary ? ? ?

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

Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>

Hi,

If John's transformer is saturating the shunts, giant power may indeed be 
being pulled from a seemingly "too small" NST.  Gary Lau's coil does seem 
to be doing this too.  Saturated shunt NSTs are probably the next "big 
thing" coming our way ;-))

Work and other things have prevented me from continuing my NST experiments 
yet, but stay tuned ;-))

I would think in this case, a wattmeter like John has should be "pretty 
close"  The harmonics are within the range of the older instrument grade 
devices.  There will always be some error, but it should not be 
dramatic.  Even a Pearson current probe (1%), Tek HV probe (2%), Tek scope 
(2%) can add to 5% error (ignoring digitizing error...).  But big 30% error 
should not exist in any case.  So, it's probably a "real thing" :-))))

If anyone can find a "better coil" John is certainly the guy to do it 
;-))  I would be more prone to not question "if", but "how and why" ;-))  I 
would not go rewriting John's spark length formula too fast...  But power 
transfer and efficiency in Tesla coils is a messy and difficult subject in 
which sweat things are expected ;-))  These days, a few miracle 
breakthroughs a year is normal :-)))

Cheers,

         Terry


At 08:09 PM 1/30/2003 -0500, you wrote:
>In a message dated 1/30/03 6:50:29 PM Eastern Standard Time, 
>tesla-at-pupman-dot-com writes:
>
>Malcolm, all,
>
>It would be good to see irrefutable proof of the results.  It would seem
>to me that extraordinary claims require strong evidence.  Indeed this
>would usher in a new era of coiling.  Perhaps some others will try
>the method and provide some peer review.  I remember
>when some folks were questioning my results with my old research
>coil, it took quite awhile before most folks were satisfied with my
>measuring technique.  I wound up using a wattmeter, and cross-
>checking it with a thermocouple ammeter with a resistive load.
>Still the results were not 100% reliable because of possible
>confusion of the wattmeter by harmonics, etc.  Most figured the
>wattmeter was pretty good though.
>
>I tried 2500 turns on a coil one time, but the results were disappointing.
>I figure the wire losses were getting too high.
>
>John
>
>
>>I'm still not clear on whether the 2 kW was actually measured. As we
>>all know, transformer faceplate ratings don't mean a thing when it
>>comes to power throughput. I'd be interested to hear a comment from
>>John Freau and others on this apparent demolition of what seemed like
>>a well-supported-by-experiment equation. I'm not of course saying
>>that it can't be done - just noting that when an apparent discrepancy
>>of this magnitude it should be properly investigated.
>>
>>Regards,
>>malcolm
>>
>