You need a few Kv to get a good spark going.  Of course if you dont feel happy working with this then stay working on 12 volt Joule THief but apart from making an LED glow longer it wont heat your house or power all your lights:)

Also Voltage = Potential Joules. If you dont put VOLTS in the ground wire you get nothing back. This system can be GREATLY enhanced using one or two more tesla stages to step up the voltage and frequency to 50kv-100kv or higher pumps more joules in the ground.

What is the min. joules needed?  Or just high voltage into the ground?

Would this 80kv motorcycle ignition work?

http://www.wpsracing.com/sphiigsyforu.html
SPYKE - HIGH-OUTPUT 80,000 VOLT COILS in a compact size. Spyke's 80,000 volt 3 ohm, high amperage coils could be just what you're looking for to power up your ignition system. These coils have extremely quick rise / fall times which equate to a much hotter spark. Works with 3 ohm electronic ignitions on Big Twins and Sportster models from 1980 to present. Available in single-fire and dual -fire models. Fits under OEM coil covers. They fire at extremely low voltage to aid in the firing of your bike when the battery is low.

Or is the capacitor rating more important? 

High Voltage Pulse Capacitor, 50kVDC .043uF! tesla coil
http://cgi.ebay.com/High-Voltage-Pulse-Capacitor-50kVDC-043uF-tesla-coil-/350364089880?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item519353be18
General Electric pulse capacitor, model 17L9PH. Used / high-voltage tested. This item is part of our surplus Web Site inventory. Rated at 50kVDC, 0.043uF, 180PPS. Impregnant: Dielektrol (non-PCB). Capacitor measures 8"x6"x19", insulator is an additional 7". Weight: 49 lbs.

Or a couple of these to get +70KV

Maxwell 0.03uF - High Voltage Pulse Capacitor 35 KV
http://cgi.ebay.com/Maxwell-0-03uF-High-Voltage-Pulse-Capacitor-35-KV-/360268492995?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item53e1acf0c3

Is this due to the switch on stray capacitance higher
switch-on current or why does this nail have more magnetism then ?

I don't think so. This can be easily confirmed by first powering up the coil and then inserting a core in it. And I don't think the "why" question is important either, you get in all sort of theories and debates without any practical aspects. The real question is, HOW do we use it in a concrete devices.

Hi Bill,
why do you say "centertapped" ?

It is more a 2 parallel wires coil.
So more or less a coil, where you wind one layer and then
don´t start the next layer reversing , but just jumping to the beginning,
although it is not a second layer but "inbetween" the first layer...

So I don´t see any center tapping here and it is also not wound
like a magnet field canceling bifilar coil, but the magnet fields
from the 2 wires just add up.

Just like Tesla´s 2 parallel wire flat coil.
It just has more capacitance such a coil.
So I wonder, why it also has more magnet field on the nail.

Does this depend only on the switchon-current,
cause the coil then acts more like a capacitor drawing
more switchon-current and thus have a higher current peak value
and thus magnetizes the nail some more ?

I think the static currents must be the same, when the ohmical
resitances are the same because of the same turn number and wire length,
so the bigger Remanenz field buildup
must come from the bigger current peak during
the switchon-current timeframe.

Regards, Stefan.

INFO VIDEO...
http://www.youtube.com/watch?v=0R1pxae9K9c&feature=player_embedded#!

Stefan:

It is hard to explain and harder to visualize.  Jeanna was the one that pointed this out.  For a long time, I didn't know what she meant, but she was right.  When you wind a JT bifilar, you tie two of the ends together just like in the video with the nails but, they are of opposite sides of the winding so that if you were to unwind it in your mind, the wire is tapped, for one lead, with the two that are tied together which are in effect the center of the total length of wire.

I am not explaining this very well but the net effect is that if unwound, you now have a wire twice as long joined in the center, the joint of which you are using as one of the leads.

In this video, skip ahead to the part where they show tying the two ends from the opposite side together (2:00 mark) and maybe this will make it more clear:

http://www.youtube.com/watch?v=gTAqGKt64WM

This accounts for the strange oscillations as they are going two different directions around the toroid.

I hope I made this make some sense.

Bill

Hi Folks,

What is shown in the video Bill referred to above at 2:02 time is how to connect two bifilarly wounds coils in series aiding fashion so that the resultant inductance between the two ENDS should be higher than any one coil measured separately. The inductance increase is approximately 3.8-3.9 times compared to any one of the individual coils.  The increase comes from the mutual inductance added to the individual coils inductance.

However, in the electromagnet experiment with the nails, the individual coils in the bifilar setup has only half of the number of turns individually (50+50) with respect to the single wound nail (100 turns) and as a result the individual coils in the bifilar must have the quarter part inductance with respect to the single 100 turn coil. SO the 3.8-3.9 times increase in the case of the bifilar coils in series just give about the same inductance value the single 100 turn coil has.  Barutologus measured this, he got the same strength, if he meant that.

rgds,  Gyula

Barutologus measured this, he got the same strength, if he meant that.
rgds,  Gyula

I meant that. My deviation for the same number of turns bewteen the two nails was 72uH to 71uH. (practically the same)

Another issue
.....
We must bear in mind that half of Kapanadze devices are mechanical ones. So the principle of work (assuming they work as claimed) is to be found on something being "switched" either mechanically or solid state. (and not likely as something that works passively e.g. a coil special coil topology)