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Re: space winding?

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Hi Gary,
Yesterday I started a reply and decided not to send. I had the same question as Gerry, but realized by your description that h/d was changing with turns. So you made "two" changes; geometry and turns. This simple change affected inductance, impedance, coupling, etc. I decided to just sit back and see what comes of the discussion (that didn't last long).
If I had the means, I would duplicate your experiment eliminating h/d and see what that turns up. That is far more difficult because as turns added the coil also grows in diameter, new primary, etc.. etc.. Maybe someday when I win the lottery, I'll do that experiment.;-))) 

Take care,
Bart

Tesla list wrote:


Original poster: gary350@xxxxxxxxxxxxx
I used the same guage wire on all the coils. I only wanted to change "ONE" thing in the system. If you make 2 changes in any experement then how do you know which change made the difference.
After I discovered the 900 and 1000 turns coils were about the same I assumed half way between 950 turns must be the best choice. I actually can't see any difference between the 3 coils in system I tested them on.
Changing the wire diameter would be an whole different experement. It is possible to make several different coils all 6" diameter all of the coils being a different length and all the coils having the same number of turns, 1000 turns per coil just by changing the wire diameter on each coil. The numbers of turns per inch changes with each wire size. 

Gary





-----Original Message-----
>From: Tesla list <tesla@xxxxxxxxxx>
>Sent: Jun 7, 2006 7:39 AM
>To: tesla@xxxxxxxxxx
>Subject: Re: space winding?
>
>Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
>
>Hi Gary,
>
>When you built your assortment of secondaries, did you use the same
>guage wire causing the H/D to be different between coils, or did you
>vary the guage to keep the H/D constant??
>
>Gerry R.
>
>
>>Original poster: gary350@xxxxxxxxxxxxx
>>
>>
>>-----Original Message-----
>> >From: Tesla list <tesla@xxxxxxxxxx>
>> >Sent: Jun 5, 2006 8:59 PM
>> >To: tesla@xxxxxxxxxx
>> >Subject: Re: space winding?
>> >
>> >Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx>
>> >
>> >
>> >
>> >Running a 12/60 NST you will see less performance, not more.  Less
>> >number of turns, lower inductance and hence less output per lineal
>> >foot of coil winding.  The trade-off is resistance vs
>> >inductance.  Beyond 1,400 turns no gains --- we have tested various
>> >coils up to 3,200 turns and gained nothing above 1500 turns.
>> >
>> >Dr. Resonance
>> >
>>
>>
>>Interesting, what diameter secondary coil were you experement with?
>>
>>I built several 6" close wound secondary coils once, one with 1000
>>turns, one with 1250 turns, one with 1500 turns.   I tested each
>>secondary coil on the same primary coil using the same cap, same
>>spark gap, same power supply, same top load.  Power was 15K
>>90ma.   I retuned the primary and spark gap trying to get best
>>output and even swapped out top loads the 1000 turn secondary
>>performed the best.  Next I built and tried a 900 turn, 700 turn and
>>500 turn secondary coil and the 900 turn secondary worked the
>>best.  Next I compaired the 900 turn coil to the 1000 turn coil and
>>could not tell any difference they both worked about the
>>same.  After that I built all my secondary coils with 950 turns
>>close wound copper wire.
>>
>>I did this experement with only 1 tesla coil using a variety of
>>different 6" secondary coils. I never tried this experement with my
>>4" TC or my 8" TC the results might be different or could be the same.
>>
>>Gary Weaver
>>
>>
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