Wireless energy transfer experiments ,Builders board

[stivep]

https://www.youtube.com/watch?v=DlHoU54Pyv0
thank you   r2fpl
Wesley

[stivep]

Is capacitance of grounded tesla coil TOP LOAD (sphere or toroid) dependent  on it  elevation regards to earth or not?
Thx

Yes it is .
That capacitor size  must be as here:
https://youtu.be/XOTLfnMOSqQ?t=950
The Top Capacitor is one plate and earth is another.
So  increasing distance between two plates makes its capacitance smaller.
Please fallow  the instruction that : D= or > 4d
It is good to have d as  large as possible.  No sharp edges and mushroom shape is the best but  not critical.
If  you  chose mushroom shape than lower  edge of the mushroom must be bend inward to prevent  discharges.
_{Note#1: no sharp corners  !!!}
Wesley

[gotoluc]

Hello Wesley, Chet and all

The below 3 video demos are my first attempts to study power transmission.
As a first start I used what I already had on hand which is a self tuning (resonance) circuit that was built by Tinsel Koala.
I had made a set of matching Primary and Secondary coils tuned to resonate at 1.1Mhz
I used a single wire as a conductive medium (instead of earth ground or aluminum foil) connected between the lower wire of each Tesla secondaries coils.
The primary on the transmitter is connected to the self tune circuit and on the receiver is connected to a 18W bulb as load.

It is important to know and understand that this 15 feet single wire power transfer demonstration is not radio transmission.
Contrary to standard theory which states current needs a return path, in this demonstration power transfer is achieved by a single wire with no return path.
Part 2 video is an attempt to prove the return path is not achieved by air transmission by enclosing the receiver (under load) in a grounded Faraday cage.
Part 3 video demonstrates a maximized power transfer (compared to part 1) and also includes an approximate bulb power (in watts) comparison.

Part 1: https://youtu.be/kwfwkAtXUKY

Part 2: https://youtu.be/DKxx42Y9nqo

Part 3: https://youtu.be/slErtdgTdbs

Regards
Luc

[stivep]

Thank you gotoluc
Great example of  Goubau line
https://en.wikipedia.org/wiki/Goubau_line
https://accelconf.web.cern.ch/accelconf/BIW2012/papers/tupg007.pdf
https://tandfonline.com/doi/pdf/10.1080/23311916.2018.1507083

https://iom3.tandfonline.com/doi/abs/10.1080/09205071.2017.1317036?journalCode=tewa20
in this last link it is considered  TE mode  instead  of TM mode.
We want  TM mode.!! in out surface wave   for our power transmission.
TM mode:   Transverse magnetic waves, also called E waves are characterized by the fact that the magnetic vector (H vector) is always perpendicular to the direction of propagation.

_{Note#1: you  can also create  two cones structure with    wire as explained in links
it will work also with magnet wire as that wire is coated with dielectric paint.
Note#2: some of  you may have problem to identify it as Goubau  due to slightly different configuration.
but we  definitely   deal with surface wave in dielectric!!!/ metal interface.
don't be surprised   if it works also with non coated   copper  wire. Yes it will but the mechanism is exactly  the same  it will be copper/ air interface.
But if  we talking about effectiveness  of energy  transmission  than use Teflon coated wire 
Note#3:  it  is not much difference  if you use  1ft aluminum foil or you use wire.}
 
Top  Capacitor:
should look like  mushroom  or  torus  but  shape  is  not  critical and not so much important ( it is just the most easy  but   still   effective  form  of  it )
Top Capacitor when is large  it has  bigger capacitance and  adjustment  can/must be  done  by changing the  size of it or elevation   .
However elevation is  that what gives us polarization and right   Brewster  Angle
https://overunity.com/18335/wireless-energy-transfer-experiments-builders-board/msg539151/#msg539151
Wesley

[poynt99]

Luc,
What I see with your experiment is that the apparently-invisible circuit is completed via the path from the top capacitance of the TC's to earth ground.
What leads you to believe that it is a longitudinal wave powering the lamp?
A Faraday shield around the RX coil won't shield the effect because essentially the earth is being used as the return conductor.
The shield may even improve the effect as it could increase the conductivity from the RX top capacitor to earth ground.