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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, >> > *********************************************** >>
Shouldn't BeUsingMyName >> >
Email: hsheltonj@xxxxxxxxx >> >>>
*********************************************** >> >> >
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