Nelson posted more on the overunity forum, referring to 2 of his latest video, with the bifilar coils and the oscillator.
Also stating that L3 was not drawn in the picture, but should be there, in the L1 L2 L3 stack, referring to the fifth video.
So the coils are coupled.
If we look at the video, we can see he uses a pulse transformer to switch the L2 coil on the high side, producing negative inductive spikes, charging c3 c4 and c5.
Nelson also uses a cap to create a disruptive discharge, by overcharging it with negative voltage.
I assume, its cr (or c4 or both, as c5 can discharge back into the L2.
If c3 or c4 discharge is the energy going into L1 or L2 or both? I think L2 is blocked by the diodes. So L1 is disruptive discharged.
L1 is also series connected to C2, probably creating series resonance. c1 might be a smaller value than c3 that also is in series with the coil.
The inductive spike charging c3 might also induce resonance in L1, but L1 will probably resonate more from L2 being pulsed.
So L1 is resonant from L2 and L1 is diruptive discahrged by c3. this will most probably be on the negative maximum of the resonance of L1 (as seen in an older video).
the floating ground is a reference to the pulse transformer.
I have no clue why L2 is used with its center tap. but I think I have enough info now to start some experiments.
those c3 c4 c5 look like xicon greeny's (a cap type easily found).
They are 100V rated, so should overcharge easily from the inductive spikes.
they are polyester, and range from 0,001uF to 0,47uF (fast search here https://www.banzaimusic.com/Xicon-Greenies/
C1 and c2 could be part of the resonant series system, so should be more high rated in voltage, to be able to deal with the resonant voltages.
R1 is just part of the pulse transformer/gate probably 5 ohm.
Not sure about those diodes, and why he uses c3 and c4 and c5 with these 2 diodes. maybe to get more punch, if c3 discharges, it gets back uped by C4, and after the discharge, it will not be fully empty, and will be refilled partly by c4, as the diode prevents a shortcut over c4 by the discharging c3
Man Nelson sure knows his riddles.
But I love it. I have had many many thoughts about his project. but never did he make this big a release.
at least for me its a bit easier to understand his circuit. know more about it.
Also know I'm not the only one he shared his riddles with.
If you know more, please share!!!