Booster 21

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Booster 21 is a v3 Super-Heavy booster prototype. Booster 21 is expected to launch on Starship Flight 14.

Manifest

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.

Cryostation, Massey Outpost, Texas, USA

Mon Jul 20, 2026

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

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.

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.