Generator by Gerard Morin

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@Tinselkoala,

You determined that both types of coils have very nearly the same Ohmic resistance in the wires.  When the circuit is driven with direct current (DC) there is no distinction between impedance and resistance. A.C. current on the other hand involves Impedance; Impedance is defined as the frequency domain ratio of the voltage to the current. Total A.C. impedance is the sum of the resistance and the ratio of the voltage to current.

The Tesla bifilar series coil has zero A.C. impedance at self resonate frequency. The single wire pancake coil can't play this trick!

The series bifilar coil will generate an A.C. magnetic field at self resonant frequency, right? What chance does the single wire coil have to compete with the series bifilar when it's stuck with it's original resistance plus the entire burden of the additional A.C. impedance? That's the sum of the Ohmic resistance plus the ratio of the A.C. voltage to current. The A.C. series bifilar electro magnet can produce a magnetic field in self resonance that is entirely free of the single wire's opposition force!   

The series bifilar needs to be wrapped so that it self resonates at 60 hertz to run off wall current and beat the single wire with a magnetic field that is more efficient then the single wire coil with it's burden of A.C. impedance.

Any size Tesla bifilar coil will generate a magnetic field more efficiently then a single wire coil if you have a signal generator that can match the A.C. current frequency to the self resonating frequency of the bifilar coil.

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Look at this A.C. attraction motor design:

A stack of bifilar power coils will ring with A.C. input tailored to match the self resonating frequency of the coils. The magnetic field of the resonating bifilar power coil will be completely free of A.C. impedance. The zero impedance A.C. bifilar power coil is pulsed by the A.C. "Reed Switch" triggered by a small magnet on the ferrite rotor. Anyone should be able to understand how this type of bifilar resonating attraction motor would run more efficiently then a single wire power coil on A.C. current.

This attraction motor pulses A.C. power at the bifilar power coil's self resonating frequency. No power can flow when the circuit's broken. This is a very feeble sketch, but the theory's fully explained now. This is a "Lenz Free" motor design. The air core bifilar power coil would have zero Micro Henries in resonance, and the ferrite rotor would have zero drag with the "Reed Switch" set at TDC. This is not an extremely versatile motor, but the COP should be very close to 1 in resonance. Harvesting the BEMF may push the motor overunity!

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Stacked bifilar pancakes in series like Skycollection's won't ring. The bifilar pancake coils would need to be connected in parallel to resonate and act in unison as an A.C. electro magnet. Stacking these bifilars back to back, wired in parallel would behave the same way, pound for pound of copper, as just wrapping one bifilar pancake from thicker gauge wire. A solenoid air core bifilar of many windings would work even better.

Multiple coils connected in series resonance have infinite resistance while coils resonating in parallel have zero. Ampere's law determines the magnetic attraction force of the bifilar.

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Marc Belanger demonstrates a looped Morin:

https://www.youtube.com/watch?v=mB1Wtve7aug