> Restarting an engine in the middle of a rotation like that, fuel sloshing around is really hard. Just restarting an engine in zero G has always been tricky, b

> Restarting an engine in the middle of a rotation like that, fuel sloshing around is really hard. Just restarting an engine in zero G has always been tricky, because the fuel is floating around and doesn't have gravity pulling it to the pump. I was re-watching a series of videos doing a walk-through if the Apollo guidance computer over the weekend and one of the cute 'yes, they thought of that' bits that was mentioned was that before the main firing sequence begins on the LEM descent they perform an 'ullage' burn using the RCS to settle fuel in the tanks.