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Lengthy video, but worth the watch, as Zack Golden’s analyses usually are.
Wish there was a tl;dr
Resonance. Old problem, new rocket.
"Resonance"is probably the best one-word explanation, but the interesting details are in how the version 2 downcomer design makes the ship more prone to pogo oscillations, what the most likely failure modes are, and how they could be addressed in the short term and long term.
Zack with NSF yesterday as he and they try to integrate the new info released by SpaceX https://www.youtube.com/live/ADw63JI9Ook?t=1h9m40s
