First of all many thanks for all the effort you've been putting into this and even more thanks for sharing it.
Got some more questions.. :)
What's the shape of the tank or pond or whatever your using? It appears to be circular?
From the video it appears that standing wave peaks are created in the pool at a highish RPM.
Would it be possible to take a still photo or a few still photos of the water waves/disturbance at a point about half way between the disc rim and the water tank wall.
Even if it's not providing thrust it seems to be creating regular pressure pulses within the water.
Which means that at a critical speed the pulses will be reflected back off the tank wall, the reflected pulses then coinciding with the outgoing pulses creating a standing wave.
I understand that precise speed control might be difficult, but it would be great if you could gradually bring the speed from zero up to max whilst filming it. Better still if you could bring up and control the speed at an RPM that creates and maintains a standing wave.
Again many thanks for all your efforts.
If they are standing waves then the disc is functioning as a very effective pulse generator.