Here is a paper summarizing a hydrodynamic approach to UAP propulsion. Using experimental data, it demonstrate how a biomimetic oscillator can push off the medium far more efficiently than standard propellers. This propulsion using non-steady aerodynamics and the added mass effect.
Experimental data confirms that the drag coefficient in oscillatory mode is vastly superior to steady-state flow. This suggests that a vibrating membrane can couple with the medium's added mass with much higher efficiency.
This also suggests "Fish out of Water" сoncept - craft accelerates in the atmosphere using aeroacoustic thrust and "leaps" into Very Low Earth Orbit (VLEO), where it continues to accelerate by interacting with the rarefied environment.
So it wont work in space.
who says uap are from space?
This is nonsense.
Yes, spacetime is a physical medium, and this explains UAP propulsion. I made a long, scientifically-sound post all about this.
The Return Of The Aether.
I agree, it was a mistake to remove this beautiful old word because of the erroneous first theories. I'll take a look.
Interesting, I haven't heard before that it was even called Illingworth drift