> Not really sloshing but you can pump fluid in tubes to mimic a reaction wheel https://ntrs.nasa.gov/citations/19910016066 https://ntrs.nasa.gov/citations/1991

> Not really sloshing but you can pump fluid in tubes to mimic a reaction wheel https://ntrs.nasa.gov/citations/19910016066 https://ntrs.nasa.gov/citations/19910016066 I think that's a little different -- it's pumping liquid around to change attitude (i.e. to point the satellite in a different direction), not to affect its rotational velocity. To get a sustained rotation, you'd have to keep pumping the liquid around continuously, which isn't terribly practical. Neat idea, though! I wonder if it's being used anywhere, or if reaction wheels won out.