Re: The 1500t secondary myth

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: robert heidlebaugh <rheidlebaugh@xxxxxxxxxxxxxx>

Dr, Res: May I share wiyh you a caution...  There are a dedicated group of
list members that beleave that the geomitry of a coil (ie turns ratio) has
no effect on voltage. I realize that thaat beleaf has no validity in science
. but that is there beleaf and reason simply dosent work with them. The
output voltage of any coil system is dependent on turns ratio and Q of the
resonant circuit and amp turns input to the primary curcuit. BUT dont tell
any one that or you will get abuse from these strange members.
   $Robert   H
--


> From: "Tesla list" <tesla@xxxxxxxxxx>
> Date: Wed, 01 Dec 2004 07:53:14 -0700
> To: tesla@xxxxxxxxxx
> Subject: Re: The 1500t secondary myth
> Resent-From: tesla@xxxxxxxxxx
> Resent-Date: Wed,  1 Dec 2004 07:54:48 -0700 (MST)
>
> Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx>
>
>
> It's not a myth --- it's physics, pure and simple.
>
> The potential developed across an inductor is V = -L di/dt.
>
> It is very apparent that the larger the inductance, the large the output
> potential (assuming similar values for the rate change of current across the
> inductor).
>
> Since inductance, L, is dependent on the physical geometry of the inductor
> and the number of turns on the inductor, the greater the number of turns the
> larger the potential.
>
> Balanced against this is the resistance of the wire which, beyond a certain
> point, impedes resonance.
>
> I have tested literally hundreds of coils and always found 1,200 to 1,500
> turns to be an optimum point for most coils in the 1 kVA to 15 kVA range.
> We start out most designs by (1) after selecting a diameter suitable for the
> power level, then determining the 4.5:1 height to dia. ratio, and then (2)
> dividing this winding length by 1,400 to determine the correct number of
> turns.  This produces a fixed wire dia. to use for the winding.  We always
> use 200 degree C wire due to its increased insulation value and tough
> finish.
>
> Resonance and current factors become more deterministic above the 12-15 kVA
> range where larger dia wires to carry the high peak currents become
> necessary.
>
> Dr. Resonance
>
> Resonance Research Corporation
> E11870 Shadylane Rd.
> Baraboo   WI   53913
>>
>> I think we've always known there was a good bit of
>> leeway, but a larger body of tests (some performed
>> with rigorous standards) have been performed by
>> coilers in the US and Europe, which support a
>> 1000-1600T secondary.  See the pupman archives.  I
>> wouldn't be so quick to call the 1500T secondary a
>> myth without a larger body of evidence to back up your
>> claims.
>>
>> Talk to you later.
>>
>> -Brett
>>
>>
>> --- Tesla list <tesla@xxxxxxxxxx> wrote:
>>
>>> Original poster: "Tom Luttrell PWRCOM"
>>> <tom@xxxxxxxxxxxxx>
>>>
>>> I finally got around to testing my latest TC set up.
>>> Due to a
>>> transportation accident that destroyed my old
>>> secondary coil I changed
>>> the configuration from 750t with an NST resonant
>>> primary cap to a 1200t
>>> secondary with an LTR primary cap. Both secondary
>>> coils have about a
>>> 4.5:1 aspect ratio.
>>>
>>> This has produced no noticeable change in the output
>>> spark length (still
>>> around 950mm for NST faceplate value of 880VA).
>>>
>>> There seems to be a large amount of leeway in the
>>> accepted wisdom of
>>> using a 1500 turn secondary.
>>>
>>> I do however feel a bit better about running my NST
>>> with an LTR cap, and
>>> also now having a flat pancake primary coil and
>>> adjustable height
>>> secondary has solved my over coupling racing spark
>>> problem.
>>>
>>> Tom.
>>>
>>>
>>>
>>
>>
>>
>
>