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Funny thing, they will be using old shuttle engines (finest engines known to man), but in expendable mode.
But despite using existing engines, conservative architecture (no reusability) and slightly longer version of Shuttle SLB's they are way way over budget (20 billion?) and very very late. They call it Senate Launch System.
I sincerely hope Starship will put an end to this.
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Thank you for your time,
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