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Re: Tesla Research Possibilities
From: bmack[SMTP:bmack-at-frontiernet-dot-net]
Sent: Tuesday, September 16, 1997 10:06 PM
To: Tesla List
Subject: Re: Tesla Research Possibilities
>
> From: Pete Demoreuille[SMTP:pbd-at-cybernex-dot-net]
> Sent: Monday, September 15, 1997 7:27 PM
> To: tesla-at-pupman-dot-com
> Subject: Tesla Research Possibilities
>
> All -
> This year I have the opportunity to do independent research
> as a class in school. Being very interested in Physics, Math and
> the like, I hope to be able to do further research into the several
> Coils that I have built. I am hoping that some of you have some ideas
> that you could share with me, or could give me comments on some of the
> design ideas that I have listed below. I hope for this to be original
> research - hopefully I will be able to enter this project as a
> Westinghouse project - but it must be original and at least somewhat
> applicable to the real world - no matter how small.
>
> I was wondering about several things. Why is the accepted standard
> of turns in the 400-1200 range? Is there a rationale?? Why hasn't
> anyone ever made a coil with many more turns, i.e. 3000+. If making
> the coil have a desirable aspect ratio is such a problem, then use a
> thinner wire, and to make higher currents possible in the coil you may
> use multiple layers wired in parallel. (and does aspect ratio really
> matter *within reason* in resonator coils or base fed coils???)
> With a secondary with many more turns, wouldn't it be possible to
> greatly increase the pri/sec coupling without having to worry about
> interturn breakdown - because there are so many more turns, the
> interturn voltage rise would be bearable.
>
Check the home page for some pointers on coiling and the archives
which contain discussions of these issues.
my personal prefence is to calculate a 1/4 wave length of wire a
frequency approx 42% greater than the target frequency. Calculate
and/or measure the inductance, then calculate the top capacitance
needed to bring the resonance down to the target freq.
This is a quick way to do it and BY NO MEANS the ONLY or
BEST way. Others on the list have their pet methods too!
There are many other technical refinements that can be made
and analysises performed, but thats why there's a Tesla list...
The aspect ratio affects Q, and Q incesaes voltage and ring time.
Tight coupling dampens the ringing, lowers Q, not to mention what
it does to the ol' frequency response curves!
Jim M
Also, relating to efficiency. Has anyone ever tried other primary
> designs? i.e. not just flat and helical, and ones with a constant
> slope, but ones with a constantly increasing slope, in order to make
> a more desireable field and completely 'immerse' the coil in the field,
> making voltage rise occur over the entire coil - not just the bottom
> half.
>
> ** many many questions coming - be warned **
> Has anyone ever done research into why the color of the sparks are what
> they are - i.e. purple when they terminate in the air, and white/blue
> when striking an object. I know that glass is supposed to give purple
> spindly sparks - but why?? the rate it discharges at? its higher
> dialectric constant?? What do caps of Barium whateveritis do to
> spark color?? why are caps with a higher dialectric constant less
> efficent when operating at RF?? why do secondary coil forms with
> a thicker wall cause more RF loss??
>
> Wow. I think I exhaused my questions for the moment -
>
> THANKS ALOT FOR ANY INPUT!
>
> Pete Demoreuille, Delbarton School
>
> ps: one more - what kind of amperage is entering the coil from ground?
> And exactly why does the amperage convert from AMPS at the bottom
> of the coil to potential at the top?? The secondary is for the most
> part DC? shouldn't current be constant??
> (last one i promise) :)
>
>
>