The Artemis rocket uses four recycled Space Shuttle main engines.
Unlike the Space Shuttle, the Artemis booster throws away the engines into the ocean after launch.
How many used Space Shuttle main engines do we have in stockpile? I’m thinking maybe enough for three more Artemis launches?
They claimed this would be faster and cheaper by using "proven" technology.
There's already an issue with foam I read about. So I think by "proven" they mean proven to be enormously rewarding to politically connected contractors and proven to be failures.
My estimate is two outcomes: either it doesn't launch; or it does and blows up shortly afterwards.
They have an engine in the pipeline for after that. It’s a riff on the SSME intended to be cheaper to manufacture but not reusable.