Results are interesting/unexpected. Light is always delayed in the vertical arm whether it is pointing up or down, implying a perpendicular flow (of the medium) with a speed of around 11 km/s, which of course reminds me the escape velocity..

Based on this experiment (and some other issues) I replaced spacetime with flow and claim that matter sucks the space around it with a speed of sqrt(2GM/r) at any distance r from its center of mass, which equals the escape velocity for that position. More precisely, every spatially isolated lump of matter (in free fall) creates a unique frame of reference around itself, that has an accelerated flow at each and every point toward the center of mass, thus exerting a (gravitational) force to all other bodies around (F=ma).

For details pls see the attachment or check

http://viXra.org/abs/1703.0009
Waiting for your comments...