The SuperHeavy booster BN-3 was rolled out on  July 1, 2021 from the High Bay and was placed on Suborbital pad A modified mount for a series of ground testing objectives.

The booster consists of 36 rings with no grid fins.

The engine section has two parts:  the thrust dome that will hold 9 Raptors, and an outer ring that will hold 20 fixed Raptors. The BN-3 booster has Raptor engines: sn62, sn57 and sn59.

The BN-3 test will pave the way for booster 4 which will host Starship 20 for a full stack orbital ride later this year.

BN3 Super Heavy booster metallic

SuperHeavy BN-3 instr manual

Model photos provided by Alexander Oehms (Twitter handle @AOehms)