ULA's Vulcan Rocket Faces New Issue in Orbital Attempt: A Deep Dive
Just moments after lifting off from Florida’s Space Coast early Thursday morning, a concerning shower of sparks emerged from the exhaust plume of United Launch Alliance’s (ULA) Vulcan rocket. Seconds later, the rocket exhibited a noticeable wobble on its axis before stabilizing and continuing its ascent into orbit, carrying a crucial batch of US military satellites. This incident, while the rocket ultimately reached its intended orbit, raises serious questions about the reliability of the Vulcan and its future in the competitive launch market. This isn't the first time a Vulcan rocket has experienced issues shortly after launch, sparking a new investigation and potentially delaying future missions.
Recurring Booster Anomalies: A Familiar Sight?
Seasoned rocket observers might find the scene unsettlingly familiar. Sixteen months prior, during the Vulcan’s second test flight, the rocket suffered a loss of one of its booster nozzles shortly after launch from Cape Canaveral Space Force Station. Despite this malfunction, the rocket successfully reached its planned orbit. The latest incident bears striking resemblance to the October 2024 anomaly, prompting concerns about a systemic issue with the booster design or manufacturing process.
Analyzing the Plume and Rolling Motion
Close-up video footage from Thursday’s launch reveals a fiery plume near the throat of one of the rocket’s four solid-fueled boosters. This area, where the motor’s propellant casing connects to its bell-shaped exhaust nozzle, is critical for directing super-hot gas and generating thrust. The plume first appeared less than 30 seconds after liftoff at 4:22 am EST (09:22 UTC). Shortly after, a cloud of sparks and debris was released, followed by a sudden, concerning rolling motion along the rocket’s long axis.
“Early during flight, the team observed a significant performance anomaly on one of the four solid rocket motors,” stated Gary Wentz, ULA’s vice president of Atlas and Vulcan programs. “Despite the observation, the Vulcan booster and Centaur performed nominally and delivered the spacecraft directly to geosynchronous orbit.” ULA has initiated a thorough investigation, including a recovery team to collect any debris, to determine the root cause and implement necessary corrective actions before the next launch.
The Graphite Epoxy Motors (GEMs): A Closer Look
The Vulcan’s solid rocket boosters, known as Graphite Epoxy Motors (GEMs), are manufactured by Northrop Grumman. These 72-foot-long (22-meter) motors are an upgraded version of those previously used on ULA’s Atlas V rocket, which the Vulcan is designed to replace. The GEM 63XL variant utilized on the Vulcan is capable of burning through over 105,000 pounds of pre-packed propellant in under 90 seconds.
Previous Booster Malfunction and Root Cause Analysis
The 2024 booster malfunction led to a 10-month pause in Vulcan launches while engineers investigated the nozzle failure. The investigation pinpointed a failure of a carbon composite insulator, or heat shield, within the nozzle. This insulator is crucial for protecting the nozzle’s metallic structure from the intense heat of the exhaust. The failure was traced back to a “manufacturing defect” in one of the insulators, resulting in its melting and subsequent burn-through of the booster nozzle.
Despite the damage, the motor continued to fire, albeit with reduced thrust and efficiency. Fortunately, the Vulcan’s BE-4 main engines, supplied by Blue Origin, compensated for the thrust differential, allowing the mission to succeed. The performance of the BE-4 engines proved critical in mitigating the impact of the booster issue.
Is the Defect Resolved? Concerns Mount
Following the 2024 incident, ULA officials stated they inspected other boosters in their inventory to ensure they were free of the same defect. However, Thursday’s anomaly suggests either the defect wasn’t fully addressed, or a separate, previously unidentified problem exists within Northrop Grumman’s booster production process. This raises serious questions about quality control and the long-term reliability of the GEMs.
Mission Success Despite the Anomaly: USSF-87 Details
Despite the booster issue, the Vulcan rocket successfully deployed multiple military satellites into a geosynchronous orbit exceeding 22,000 miles (nearly 36,000 kilometers) above the equator. The mission, designated USSF-87, launched the Space Force’s seventh and eighth GSSAP (Geosynchronous Space Situational Awareness Program) surveillance satellites, also built by Northrop Grumman. These satellites are designed to monitor other spacecraft, including those operated by China and Russia, providing crucial space domain awareness.
The USSF-87 mission also included a third payload dedicated to testing “additional research, development and training systems” for refining on-orbit maneuver tactics and enhancing the resilience of assets in geosynchronous orbit, according to Space Systems Command.
Implications for Future Launches and National Security
While the Vulcan’s ability to overcome such a significant anomaly is commendable, two similar failures in just three flights will undoubtedly give military officials pause. Entrusting ULA with future national security payloads requires a high degree of confidence in the rocket’s reliability. The next Vulcan launch, currently scheduled for no earlier than March with a GPS navigation satellite, is now in doubt.
The military’s Space Systems Command has affirmed its commitment to working closely with ULA through its rigorous mission assurance space flightworthiness process before authorizing any further national security space missions. This process will likely involve extensive reviews of the investigation findings and implementation of corrective actions.
ULA's Position in the Launch Market: Facing Increased Competition
Thursday’s launch marked only the second operational national security mission flown on ULA’s Vulcan rocket, and the fourth overall launch since its debut 25 months ago. Pentagon officials have previously criticized ULA for delays in bringing the Vulcan into service. The Space Force currently has 27 launches booked on Vulcan rockets, representing a significant portion of ULA’s future business.
Initially, ULA planned to conduct 16 to 18 missions with the Vulcan, alongside 2 to 4 flights of the retiring Atlas V rocket. Key milestones for the Vulcan this year included the first launch with Amazon’s Project Kuiper broadband satellites and the first mission from Vandenberg Space Force Base in California. However, ULA fell short of its goal of up to 10 Vulcan launches in 2024, completing only one.
ULA, once the dominant player in the national security launch market with its Atlas V and Delta IV rockets, has been overtaken by SpaceX as the Pentagon’s leading launch provider. Furthermore, Blue Origin, ULA’s engine supplier, is also actively competing for military launch contracts with its heavy-lift New Glenn rocket. The competitive landscape is intensifying, putting pressure on ULA to deliver a reliable and cost-effective launch solution.
The Road Ahead: Addressing Reliability Concerns
The recurring booster issues with the Vulcan rocket represent a significant challenge for ULA. Addressing these concerns is paramount to regaining the trust of the military and maintaining its position in the increasingly competitive launch market. A thorough and transparent investigation, coupled with effective corrective actions, will be crucial for ensuring the Vulcan’s long-term success. The future of ULA, and its ability to support critical national security missions, hinges on its ability to resolve these reliability issues and deliver on its promises. GearTech will continue to follow this developing story and provide updates as they become available.