TopRuslan

[Dog-One]

As I understand the bigwire coil is connected between ground and the grenade. Tuned at the same frequency as kacher and grenade.

Nice detective work.

Do you recall in an earlier video when Ruslan was talking about the
Kacher.  He stressed one side of the secondary had to be connected
to a firm ground.  This is what provides a solid anchor for the coil to
push against in one direction.

Add that to this new modification.  Suppose one side of the kacher
secondary now pushes against this "extra coil" instead of ground.
It would most certainly put it into oscillation, possibly resonance.
What that does to the other side of the kacher secondary, I have
no idea, but it may prove useful to experiment with.  I suspect it
would act as a dampener, so apecore is probably correct, the low
side of the kacher secondary still connects to ground and the grenade
coil pushes against it instead.  Seems like this may setup a resonate
reference point--perfect for standing waves.

[apecore]

Nice detective work.

Do you recall in an earlier video when Ruslan was talking about the
Kacher.  He stressed one side of the secondary had to be connected
to a firm ground.  This is what provides a solid anchor for the coil to
push against in one direction.

Add that to this new modification.  Suppose one side of the kacher
secondary now pushes against this "extra coil" instead of ground.
It would most certainly put it into oscillation, possibly resonance.
What that does to the other side of the kacher secondary, I have
no idea, but it may prove useful to experiment with.  I suspect it
would act as a dampener, so apecore is probably correct, the low
side of the kacher secondary still connects to ground and the grenade
coil pushes against it instead.  Seems like this may setup a resonate
reference point--perfect for standing waves.

Seems your explanation is legit in some way.
I added additional explanation from Ruslans comment in his vid.

Question now is,... are grenade and tesla secundairy both connected at the left side of  the one millimeter coil?
Further, grenade and big wire coil are still wound on 50mm core.
Tesla I guess 32mm.

So the big coil has 60 windings, makes it nearly 10meter wirelength, so this coil would be tuned down with extra parallel cap i guess?

So what would be the resonance frequency of the grenade?...
Looking at the tesla coil its hard to say, depends on the topload... this topload seems to be coaxwire were only shielding is used?

[NickZ]

   I think that in not using the Tv yoke core, he lost 80 percent of his normal previous output.
   Nor will he provide a diagram or actually tell you how it all really works. Ever...
  The fact that 9 volt battery will kick start it, is the only advantage that I can see, from this device. Of course, if true. He lost most of his credibility, as far as I'm concerned.
   NickZ
 

[r2fpl]

in: 5V to 40V
out: 1.2V to 35V

What's the point of using it here? could it be like a filter?

[r2fpl]

Someone drew a diagram as you can see in the video.
It's definitely not 100% maybe 60% or less