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Re: Off-axis primary inductance
>
>
> Actualy if you guys took a good look at the photos of Dr. Tesla's
> colorado spring coil you would see that he to used an off-axis tunable
> inductor to finetune his primary and secondary circuits. That is probably
> how he was able to get such spectacular results with such a comparably
> poor design.
>
> Alfred A. Skrocki
> Alfred.Skrocki.Sr-at-JUNO-dot-com
> Visit my Do-It-Yourself Aquarium WEB page at:
> http://WWW.GeoCities-dot-com/CapeCanaveral/6251
>
Actually, Tesla got pretty poor sparks in Colorado (for the power
expended). They were quite often thin and whispy and the longest sparks on
an average run rarely exceeded 15 feet, but on rare occassions he might get a
20 footer. As I note in my book on the CSN, Tesla, by his own admission, in
his own notes, never more than twice hit 30 feet of output spark (straight
line point-to-point). I would not attribute good or bad sparks to his
regulating coil. It let him tune very finely, but in the worst case, he
might have had 50% of his inductance off line and uncoupled. He liked to
have very little off axis inductance in the regulator and adjusted his
capacitor bank accordingly to have as close to zero turns in the regulator.
Finally, he admitted, verbatum, that the system always performed best "with
all turns OUT on the regulating coil". It is in the CSN. The use of the
coil just destroyed his coupling and reduced the energy sent into or coupled
into the system. It will do this on any Tesla coil with a fixed coupled
primary.
In some cases this off axis inductance might make a coil work better!!
Yes! If the coiler has unwittingly over-coupled, under-quenched, and
under-ballasted his system, a few off axis turns to tune might actually aid
performance, but it is strictly due to bringing the system into a coupled,
power harmony and not just resonant tune.
Richard Hull, TCBOR