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Re: TC coil experements 7 years ago



Original poster: Mddeming@xxxxxxx I'm afraid it would not keep everything identical as the inter-turn capacitance, and therefore both the resonant frequency and the fraction of total energy stored in the topload capacitance would be different. It is almost impossible to find two TCs that are different in one and only one parameter. It may, in fact, not be possible to do.

Matt D.

In a message dated 4/20/07 12:07:07 A.M. Eastern Daylight Time, tesla@xxxxxxxxxx writes:
Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>

Yes!  While Gary Weaver's experiment does on the surface seem like a
definitive result, a more useful experiment would be to compare the
performance of two secondary coils with identical inductance but
different H/D ratios.

For instance, compare coil #1 - 4"x20.5" #24 H/D=5.13  L=15.84uH, to
New coil #4 - 6"x10.5" #24 H/D=1.75 L=15.80uH

Care would also have to be taken to keep the pri/sec coupling identical.
This would keep everything but the H/D ratio constant.  If the power
level was kept small enough that secondary flashover and racing sparks
don't occur on the shorter coil, I would wager that no difference in
performance would be seen.

Regards, Gary Lau
MA, USA

> Original poster: Finn Hammer <f-h@xxxx>
>
> Gary,
>
> Secondary inductance went from 9,96mH trough 21,54mH to 36,87mH
> Your resonant frequency went from 289kHz trough 197,42kHz to
146,94kHz
> Your primary inductance went from 28,5uH trough 65,3uH to 117,6uH
>
> This means that your surge impedance went from:
> 53,38 ohms trough 80,8 ohms to 108,4 ohms
> and your primary peak current (assuming 15000 volts on cap) went from
> 280A trough 185,6A to 138,3 A
>
> What I am saying:
>
> You did not take gap losses into consideration, and they might have
> been the cause of the difference in performance.
>
> Cheers, Finn Hammer
>
>
> Tesla list skrev:
> >Original poster: gary350@xxxxxxxxxxxxx
> >Vanderbelt University did some research on Tesla Coils.  The best
> >length to diameter ratio is 3 to 1 according to them.  Research
> >shows 3/1 is better than 4/1 and that is better than 5/1.  If you
> >are going for absolute maximum output try 3/1 ratio.
> >I did some experenents with this myself and built 3 Tesla
> >Coils.  The 3 TCs are identical only thing that changes is the
> >secondary coil diameter to length ratio.
> >TC #1, 950 turns #24 wire 20.5 inches in length wound on 4" PVC pipe.
> >TC #2, 950 turns #24 wire 20.5 inches in length wound on 6" PVC pipe.
> >TC #3, 950 turns #24 wire 20.5 inches in length wound on 8" PVC pipe.
> >I used the same 15K 60ma neon sign transformer.
> >I used the same .01 uf capacitor.
> >I used the same VSVFSG spark gap.
> >I used the same top load, toroid 14" diameter 4.5" thick.
> >I built a flat would primary coil for each secondary coil.  The
> >inside turn of each primary was 2" from the secondary coil.  Primary
> >were all would with 1/4" copper tubing, flat wound, spacing 1/2"
> >center to center, 18 turns each.
> >The only thing in the circuit that changed was the secondary
> >coil.  The primary coil physical shape had to accommodate the
secondary coil.
>
>
>







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