Generaly light and liquid have many common problem .
we schold test not use mathematica and books !!!

dyfusors, Bernouli preasure ( potencial, dynamic ) we need find
analogy .

Below better engine than EMdrive system
Marosz Radial Engine we can change liquid for light ( optic wire = pipe )

http://3.bp.blogspot.com/-KvbiJE7kh5k/U0LCZpKVdII/AAAAAAAABrg/oSualfVuM3A/s1600/zz.jpg

http://youtu.be/Nx6wvh0K37M

http://youtu.be/iTQweoVZspc

http://youtu.be/Nx6wvh0K37M