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Re: [TCML] magnifier efficiency

Bart,
Yes, i did those types of comparison tests at various break rates, etc, and found the best "efficiency" at 120 bps. I was limited in space so I wasn't able to run all that much power. So I stated at the time that since I couldn't make comparisons at the higher powers, I couldn't comment on those situations. And yes, I had to include coils built by others to validate my formula, since I couldn't operate at those higher power levels. At the time, folks were using a linear measurement of 500 watts per foot of spark. I think this came about because most small coils seemed to be rather inefficient in those days. Once I was able to build more efficient small coils, and compare them with various large coils built by others, I saw that the square law was involved. After that it was just a matter of choosing the right coefficient (1.7) to directly relate input 
power to spark length.  That is the story of how I came up with the
formula.

I'll include the formula here for anyone who is not familiar with it.

 spark length (inches) = 1.7*sqrt input power (wallplug watts)

Cheers,
John
--


-----Original Message-----
From: bartb <bartb@xxxxxxxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Wed, 10 Dec 2008 9:00 pm
Subject: Re: [TCML] magnifier efficiency
John, I apparently missed this detail about the formula. I remember wh en you performed various testing (keeping around 1050W for comparison purposes) and I know you also ran obvious 120 bps as well as higher break rates (up near 400 bps?). In my mind, my conclusion was that with the coils "you" personally tested, 120 bps gave best results. From that is where my conclusion was derived. But if other coils are also included during the formulation sequence, then excellent! This was something I was not aware of.  
 
Best regards, 
Bart 
 
futuret@xxxxxxx wrote: 

Bart, 
 
My formula is based on my coils but also on other folks' larger > 
coils. I always said 
that my formula was based on various coils such as my research coil, Hull's Nemesis,  
Greg Leyh's Electrum, etc. 
 
John 
-- > 
 
-----Original Message----- 
From: bartb <bartb@xxxxxxxxxxxxxxxx> 
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx> 
Sent: Tue, 9 Dec 2008 8:57 pm 
Subject: Re: [TCML] magnifier efficiency 
 
 
John, > > I thought you ran your testing of which the formula was
derived at 120 > bps? I agree that higher bps may also meet the formula's prediction > (may not, may exceed), but I thought the formula itself was derived > with 120 bps operation. Is this not correct? > > Take care, > Bart > > futuret@xxxxxxx wrote: >> >> Bart, >> >> My formula does not specify 120 bps.=2 0For small coils, 120 bps is > > needed to >> obtain adequate efficiency, but for larger coils, the bps can often > be >> higher at 400 to 600 bps, etc. and still meet the formula's > > "predictions". >> >> Large coils tend to be more efficient anyway in the sense that > > transformers >> and maybe other components become more efficient when they're larger. >> The lower frequencies that large coils usually run at may help also. >> >> John >> >> -----Original Message----- >> From: bartb <bartb@xxxxxxxxxxxxxxxx> >> To: Tesla Coil Mailing Li 
st <tesla@xxxxxxxxxx> >> Sent: Tue, 9 Dec 2008 12:44 am >> Subject:
Re: [TCML] magnifier efficiency >> >> >> The formula assumes the efficiency of John's coils at the measured > > power, measured spark length, at 120 bps. It is an excellent > > prediction of potential spark length and has stood the test time. Many > > times, coilers will fall below this value (based on their lack of > > experience or lack of attempts to produce longer sparks with a given > > coil). Other times coilers produce longer than predicted sparks (it > > happens). > > The formula is empirical and not based on 100% > efficiency or anything > of the sort. > > Take care, > Bart > > H.S. > J. wrote: >> But, the formula most likely assumes 100% efficency and > power > transfer. >> > -- >> Thanks, >> > *********************************************** >> Shelton Jacinto >> > Email: hsheltonj@xxxxxxxxx >> >>> *********************************************** >> >> > _______________________________________________ > Tesla mailing list > > Tesla@xxxxxxxxxxxxxx > http://www.pupman.com/mailman/listinfo/tesla > >> _______________________________________________ >> Tesla mailing list >> Tesla@xxxxxxxxxxxxxx >> http://www.pupman.com/mailman/listinfo/tesla >> > _______________________________________________ > Tesla mailing list > Tesla@xxxxxxxxxxxxxx > http://www.pupman.com/mailman/listinfo/tesla >  
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