Do gravity drives work in a Moon's gravity well (0.25G) by "thrusting" upwards? Are the artificial mass blocks affected by artificial gravity only or also natural gravity (making the entire process of escaping the Moon unefficient)? For example: I have a 2,5 million KG ship that I want to escape the Moon with using only the gravity drive. I figured that 2 sets of gravity drives each with 6 art. masses and 6 grav. gens would generate 18 MN total which would be enough to make the ship accelerate upwards at 4.7 m/s^2 but my ship doesn't lift off the ground. P. S: I know that natural gravity gradually cancel the artificial gravity generators, but these are just canceled at 0.5G.