The third generation of Starship and Super Heavy, powered by Raptor 3 and launching from an entirely new launch pad, incorporate learnings from years of flight testing and development.
SUPER HEAVY V3 CHANGE HIGHLIGHTS
The Super Heavy V3 booster features several significant upgrades. The number of grid fins has been reduced from four to three, with each fin now 50% larger and significantly stronger. These fins include a new catch point and have been re-clocked on the booster to support vehicle lift and catch operations. They have also been lowered to reduce heat exposure from Starship’s engines during hot-staging. Additionally, the grid fin shaft, actuator, and fixed structure have been moved inside the booster’s main fuel tank for better protection.
An integrated hot stage replaces the previous single-use protective interstage. The forward dome of the booster fuel tank is now directly exposed to the Starship upper stage’s Raptor engines upon ignition, with the booster’s internal fuel tank pressure and a non-structural layer of steel protecting it during stage separation. And the actuators on the interstage that connect the ship and booster now retract after separation to further shield them from Raptor exhaust.
The fuel transfer tube, which channels cryogenic fuel from the main tank to the 33 Raptor engines, has been completely redesigned and is now roughly the size of a Falcon 9 first stage. This new design enables all 33 engines to start up simultaneously and faster, more reliable flip maneuvers.
The aft end thermal protection system has been redesigned, with propulsion and avionics systems now tightly integrated to coordinate the distribution of fluids, power, and networking to the 33 Raptor engines. Large individual engine shrouds have been eliminated, and shielding has been added to the surface area between engines and around the thrust vector control hardware on the inner 13 engines. The carbon dioxide fire suppression system has been removed following the deletion of the aft cavity and engine shrouds.
Finally, the booster has gone from a single quick disconnect, which is the primary path for loading fuel and oxidizer into the vehicle, to two physically separated connection points. This change provides additional redundancy between the pad and vehicle connections while allowing the supporting mechanisms to be smaller and less complex.
STARSHIP V3 CHANGE HIGHLIGHTS
Starship V3 incorporates a clean-sheet redesign of its propulsion systems. These changes enable a new Raptor startup method, increase propellant tank volume, and improve the reaction control system used for steering while in flight. The propulsion updates also reduce contained volumes in the aft end of the vehicle that could trap propellant leakage.
