Booster 4


B4, the third complete Super Heavy booster, is also known as Booster 4.

Test history

No tests conducted yet


Booster 4 (B4) followed pathfinder BN1, test tank BN2.1, and prototype BN3 to become the third fully assembled Super Heavy booster. Initially intended to be the first booster to attempt an orbital flight alongside S20, plans shifted when Elon Musk announced that the debut orbital mission would use Raptor 2 engines and feature new prototypes.

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