Booster 21

Expended

Booster 21

Booster 21 is a v3 Super-Heavy booster prototype. Booster 21 flew on Starship Flight 14, during which it became the first Version 3 booster to softly splashdown in the Gulf.

Manifest

33-Engine Static Fire

Pad 2, Starbase, Texas, USA

Fri Aug 28, 2026

Booster 21 was loaded with propellants and completed a roughly 15-second full-duration static fire with 33 engines.

Watch

Cryogenic Proof Test #3

Cryostation, Massey Outpost, Texas, USA

Mon Jul 20, 2026

Booster 21 conducted a cryogenic proof test to verify the structural integrity of the vehicle.

Cryogenic Proof Test #2

Cryostation, Massey Outpost, Texas, USA

Sun Jul 19, 2026

Booster 21 conducted a cryogenic proof test to verify the structural integrity of the vehicle. The tanks were partially loaded for this test.

Cryogenic Proof Test #1

Cryostation, Massey Outpost, Texas, USA

Sat Jul 18, 2026

Booster 21 conducted a cryogenic proof test to verify the structural integrity of the vehicle. The tanks were partially loaded for this test.

Up Next

Booster 21

Booster 21

Manifest

Cryogenic Proof Test #3

Cryogenic Proof Test #2

Cryogenic Proof Test #1