alt Hacker NewsNot just excess - excess and toxic. Hydrazine derivatives and nitrogen tetroxide, IIRC. They are hypergolic, too, so the easiest way to vent them is just to run the engines until empty. However, to prevent moving the craft too much, you do short bursts.
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TomatoCo • today at 1:06 AM
There should be an opposite thruster for each axis. I wonder if the short bursts were due to heating limits.
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On the press conference they mentioned the RCS was used to orient the craft with the most sturdy part facing down for the ocean impact.
Otherwise I would also just bet on RCS venting like in Apollo.