SpaceX successfully launched its Starship Version 3 (V3) architecture on its inaugural test flight on Friday, May 22. The mission, designated Flight 12, achieved the primary objective of placing the Starship upper stage on a suborbital trajectory and executing a controlled atmospheric reentry, culminating in an on-target splashdown in the Indian Ocean.
However, the mission was not without incident. A booster anomaly during the return profile resulted in the Super Heavy first stage failing to complete its boostback burn, prompting an early mission termination for the booster in the Gulf of Mexico.
The launch occurred at 6:33 p.m. Eastern Time from the newly constructed Launch Pad 2 at Starbase, following a 24-hour delay caused by ground support equipment issues.
Navigating the scrub
The initial launch attempt on Thursday, May 21, was scrubbed at the T-40 second mark. According to SpaceX, the hold was triggered by motion anomalies within the launch tower’s quick disconnect arm, which supplies propellant to the upper stage.
A hydraulic pin failed to retract properly, creating a “tug-of-war” between the arm attempting to maintain pressure on the vehicle and the system attempting to release the pin. With the 124-metre (407-foot) vehicle fully loaded with over 5.2 million kg (11.5 million pounds) of liquid methane and liquid oxygen, the scrub served as a successful wet dress rehearsal.
Overnight, SpaceX engineering teams welded additional hardware to stabilize the arm and adjusted the software logic governing the release mechanisms, successfully clearing the issue for Friday’s attempt.
V3 architecture and launch pad 2 upgrades
Flight 12 marked a significant hardware transition for the Starship program. Both the Super Heavy booster and the Starship upper stage underwent a “clean sheet” redesign to increase payload capacity and optimize for rapid reusability. Key upgrades included:
- Super Heavy Booster: The transition to an integrated hot-stage ring (eliminating the jettisonable version) and a reduction from four grid fins to three, which were increased in size by 50%. A redesigned internal fuel transfer tube enabled all 33 engines to ignite simultaneously at liftoff.
- Starship Upper Stage: A redesigned propulsion system, increased propellant tank volume, and the addition of four docking ports to facilitate future in-orbit propellant transfer operations.
- Raptor 3 Engines: The flight debuted the Raptor 3 engines on both stages, featuring a redesigned ignition system, increased thrust, and a lighter profile achieved by internally integrating sensors and controllers.
- Launch Pad 2: The new pad features a bi-directional flame diverter, separated fuel and auxiliary systems, and 100% electromechanical actuators on the launch tower “chopsticks,” replacing previous hydraulic systems.
Ascent and booster anomaly
At liftoff, all 33 Raptor 3 engines on the Super Heavy booster ignited successfully. Approximately 1 minute and 42 seconds into the flight, one booster engine shut down, but the vehicle’s engine-out capability allowed the ascent to continue nominally. Hot-staging separation was executed successfully.
Following separation, the Super Heavy booster was programmed to execute a boostback burn to target a soft splashdown in the Gulf of Mexico. However, telemetry indicated an erratic engine startup, and the booster failed to relight the required number of engines. The burn was terminated early, resulting in the booster crashing into the Gulf of Mexico.
Following the flight, the Federal Aviation Administration (FAA) issued a statement acknowledging the incident:
“The FAA is aware an anomaly occurred during the SpaceX Starship Flight 12 mission that launched from Starbase, Texas, on May 22. The anomaly involved the Super Heavy booster during its flyback over the Gulf of America*. There are no reports of public injury or damage to public property.”
The FAA confirmed it activated a Debris Response Area and determined that all booster debris fell within the pre-cleared hazard zone. The agency is currently assessing the operation, though a formal mishap determination has not yet been made.
Upper stage operations and reentry success
Despite the booster’s early loss, the Starship upper stage successfully ignited all six of its Raptor engines—three sea-level and three vacuum-optimized (RVAC) engines. One RVAC engine failed shortly after ignition during the ascent burn, but the flight computer immediately compensated by gimballing the remaining engines and extending their burn time, successfully placing the vehicle on its targeted suborbital trajectory.
While coasting in space, Starship executed a payload deployment test, utilizing an upgraded “PEZ dispenser” to deploy 22 satellites. The payload consisted of 20 Starlink mass simulators and two modified V2 Mini satellites, dubbed “Dodger Dogs.” The latter served as technology demonstrators for future V3 Starlink components and were equipped with external cameras and lighting. SpaceX confirmed the satellites successfully transmitted imagery of Starship’s heat shield back to Earth via the Starlink network.
Due to the earlier RVAC engine anomaly, launch controllers opted to skip a planned in-space relight demonstration of a Raptor engine.
The vehicle then initiated atmospheric reentry. SpaceX utilized the descent to test the thermal protection system under rigorous experimental conditions. Engineers had intentionally removed a single heat shield tile prior to flight to measure how aerodynamic loads and plasma heating shift onto adjacent tiles. Additionally, specific tiles were painted white to serve as high-contrast visual targets for the deployed diagnostic satellites.
During the descent, SpaceX also conducted a “flaps flap” stress test at Mach 7, intentionally pitching the vehicle to maximize aerodynamic pressure on the aft flaps. Telemetry and live video feeds confirmed the flaps and the heat shield—which included experimental leeward-side tiles—remained intact through peak heating and dynamic pressure. Despite the intentional stress tests and the missing tile, the heat shield protected the vehicle’s structural integrity.
The flight concluded with a successful subsonic banking maneuver, a flip utilizing two sea-level Raptor engines, and a controlled, on-target soft splashdown in the Indian Ocean, 1 hour and 6 minutes after launch. Data from the splashdown was captured by remote, Starlink-equipped buoys deployed by a recovery team stationed in the area.
While Flight 12 did not achieve all of its secondary objectives, the successful demonstration of the V3 architecture and upper stage reentry will likely serve as a strong proof of concept ahead of SpaceX’s highly anticipated IPO roadshow next month.
* Note: The U.S. government has changed the designation of the Gulf of Mexico to the Gulf of America. This designation is not internationally accepted including by the Canadian government. SpaceQ follows the guidance of the Canadian Press Style Guide.