[Moonman62]

What is its power relative to the Saturn 5?

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According to Wiki it looks like the two solid boosters combined would be 7.2 million pounds of thrust. The Saturn was 7.5. The SLS also has a center core which would make it altogether more powerful than the Saturn V.

[doorgunner69]

Yabbut, the F-1 could be throttled. Amazing they had to cut one engine back as the fuel load dropped off to keep the acceleration under control. That beast wanted to go and go.

Or so I understood the need to shut off one engine.