There was some dispute in the IML as to whether a multirotor could make water slosh out of a cup.
Instead of water, we used isopropyl alcohol (in case anything spilled), colored with pen ink.
The reason why the fluid does not spill out is because a multirotor is incapable of accelerating in a plane horizontal to the vehicle blades. Thus the thrust vector is always perpendicular through the cup.
You'll notice that we can introduce very tiny sloshes, which are damped very quickly. These tiny sloshes occur only when rotating about a pitch or roll axis. This is due to the fact that the fluid is located a non-null distance away from the center of gravity, so there is actually a minute amount of translational acceleration on the cup.
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