The Hubbard Coil

[captainSensible]

they are all bifilar wound although have different connection types.

[Verpies]

they are all bifilar wound although have different connection types.

Yeah and this makes them act very differently.
So which one do you mean when you use the word "bifilar" in the context of this device ?

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What about you CaptainSensible ?
Does the following arrangement of cores and windings resemble the Hubbard arrangement to you ?

   

[unimmortal]

The geometry I'm proposing is holding up to riguer. The suggestion by AI to put protective tape between layers/coils aligns nicely with the historical description of a protective heavy wrap.

I've cut a couple of 1" tubes, 1.2mm wall, 8" long. I've also made a 'sleeve' using 9 metres of awg18. 0mH.

Sliding the sleeve over a tube showed  .107mH. Over a tube with a 2mm lengthways split, .277mH, but the diameter of the tube had to extend out of the sleeve. The tube with split acoustically sounded more open and clear, with harmonics that could also be tuned? Nonetheless, this slit will form the magnetic flux gate and dictate the flow direction of the magnetic flux.

Now for the dark arts. The only way Hubbard could achieve a self resonant standalone coil is to use distributed variable pitch winding for the resonators. This means working out which base frequency we want the coil to resonate in response to the centre coil with a phi ratio physical geometry, and then devise a pitch ratio that will set a higher self resonant frequency that supports electromagnetic resonance.

The historical notes of 2.8GHz/2^19=5.34KHz and multiples of, implies this is the base 2 or octave we should work from, but where to start still isn't clear to me yet.

[unimmortal]

What is the source of information about the number of windings and layers wound on the central post and the satellite cores ?
Also, what is the source of information about the winding type ?

Deduction. A central tube and coil was historically described as a single winding. The output can't interfere with the input, so it needs shielding and to be wound directly on a tube where the flux is. The resonators were historically described as primary/secondary. The outer winding has multiple jobs to do, but can't interact with the primary tube - even though it is wired to it, and must be induced by the shield. The resonators have to be individually tuned (for the sake of sanity) so that all 8 resonate perfectly with the centre coil. Gauge and turn count will be dictated by frequency...

Winding will be CW inner and outer, and CCW for the resonators. This will aid in creating flux pressure as the resonators will 'buck' the inner and outer coils, that flux looking for lower pressure, will be drawn around via the tube slit or gate of each resonator. Output will be CW.

I've played around a little with bifilar, it'll be interesting to see what you come up with.

[Verpies]

I've played around a little with bifilar, it'll be interesting to see what you come up with.

Just so we are clear: I am not suggesting to use a bifilar winding type ...or a conventional winding type.
...however, if someone decides to use such winding type, then I'd like to know exactly which one of the 4 topologies are meant by the word 'bifilar".

This will aid in creating flux pressure as the resonators will 'buck' the inner and outer coils, that flux looking for lower pressure, will be drawn around via the tube slit or gate of each resonator.

Please draw the geometric interaction between magnetic flux and the tube slits.
Also, please depict the envisioned flux bucking diagramatically.

[captainSensible]

they are all bifilar wound although have different connection types.

Yeah and this makes them act very differently.
So which one do you mean when you use the word "bifilar" in the context of this device ?

---------------------------------------------------------------------------------------------------------------------------
What about you CaptainSensible ?
Does the following arrangement of cores and windings resemble the Hubbard arrangement to you ?

I'm afraid I've not looked into the Hubbard in detail.
But while we're on the subject of bifilar coils, here a question (or two)..

1. Tesla's patent for series wired bifilar coils increases energy storage by 250000 times compared to a single filar coil. But how much does it increase the capacitance by?

2. If two mutually coupled inductors L1 and L2 are wired in opposing series configuration (bucking) with mutual inductance M, what is the total stored energy compared to if it was just L1 or L2 in the circuit?. 
The total inductance is less than L1 or L2 so stored energy should be less. But how can it be less when each inductor is storing the same amount as it would alone, so together the total energy must increase?

[Verpies]

I'm afraid I've not looked into the Hubbard in detail.

This is what this thread is about.
If you have not looked into the primary subject of this thread then you cannot answer whether this core/winding arrangement reminds you of the Hubbard arrangement.

But while we're on the subject of bifilar coils, here a question (or two)..
1. Tesla's patent for series wired bifilar coils increases energy storage by 250000 times compared to a single filar coil. But how much does it increase the capacitance by?

By a lot.
The final capacitance depends on the proximity of the turns and the dielectric material between the turns, e.g.: air, enamel...

2. If two mutually coupled inductors L1 and L2 are wired in opposing series configuration (bucking) with mutual inductance M, what is the total stored energy compared to if it was just L1 or L2 in the circuit?. 

If the coupling coefficient (k) is 1 then the lumped inductance of the mutually coupled inductors is zero and only the inter-turn capacitance and transmission line effects can store energy.
If the coupling coefficient (k) is less than 1 then the lumped combined inductance is greater than zero and such winding can also store energy in the bulk magnetic field E=½Li² , in addition to the inter-turn capacitance and transmission line effects.