Connect with us

News

SpaceX Starship saved by ‘burst disk’ after Raptor static fire ends badly

For the second time, a Starship Raptor engine test has caused a secondary fire that severed some of SpaceX's control over the rocket. (NASASpaceflight - bocachicalgal)

Published

on

Around 7:15 pm local time, SpaceX Starship prototype SN8 fired up one or several Raptor engines for the third time ever, catching onlookers – only expected a dress rehearsal – by surprise. An hour later, CEO Elon Musk revealed that SpaceX had effectively lost control of the rocket.

Unfortunately for SpaceX, this is not the first incident in which a fire led to a loss of Starship control. Back in May 2020, Starship serial number 4 (SN4) – the first full-scale prototype to have a Raptor installed – completed its third successful static fire test. Moments later, a vent line adjacent to the engine section caught fire, burning for a minute or two. Ultimately, likely due to destroyed wiring or plumbing, SpaceX seemingly lost control of SN4 and had to wait a full two days for cryogenic propellant to boil off and evaporate before teams could approach the rocket to inspect, repair, and regain control.

Now, more likely than not, Starship SN8 has suffered a similar – but not identical – failure, cutting some level of control. Elon Musk took to Twitter about an hour after the rocket’s third Raptor static fire, revealing that SpaceX had lose control of Starship’s pneumatics, referring to hydraulic systems needed to operate most of the rocket’s valves. For SN8, that meant nothing but bad news.

As cryogenic liquids (and all things in general) warm up, they expand, taking up more volume. To counteract that never-ending process of cryogenic propellant warming up, boiling, and turning to gas, fresh propellant is almost continually loaded while warmer gas is vented, thus maintaining safe tank pressures. If the ability to vent those gases is lost, the ability to maintain safe pressures goes with it.

As Musk noted above, Starship SN8 thankfully – and unexpectedly – had one or several burst disks installed, referring to single-use mechanical valves designed to open (i.e. burst) above a specific pressure. SN8’s nosecone burst disk did just that, bursting to create an outlet for the pressure building inside the rocket and thus preventing the small nose-based liquid oxygen (LOx) tank from exploding.

Advertisement
A torrent of molten metal pours from Starship SN8’s engine section after a seemingly successful static fire. (NASASpaceflight – bocachicagal)

Unfortunately, the precursor to Starship losing control is a much less positive story. According to Musk, one of the Raptor engines SN8 ignited may have suffered a significant failure, melting one or more critical engine components. It’s unclear how exactly a seemingly contained engine failure evolved into a total loss of Starship hydraulics but it’s safe to say that redundancy will be added and updated designs will be implemented to ensure that a similar failure doesn’t reoccur.

Notably, both unofficial LabPadre and NASASpaceflight.com livestreams clearly showed Starship quite literally dripping molten metal for more than two minutes after the static fire. Whatever the cause of that extremely hot fire, anything that can continuously melt metal for minutes will have almost assuredly ravaged Starship SN8’s aft and the Raptor engines installed therein. It’s nothing short of miraculous that SN8’s main LOx tank wasn’t breached, as well.

Some 80 minutes after ignition and the resultant Raptor fire, Starship SN8’s nosecone ‘burst disk’ thankfully worked as designed, relieving building pressure and avoiding a far more destructive failure. (NASASpaceflight – bocachicagal)

Ultimately, SN8 will likely need extensive repairs – and one, two, or even three replacement engines – before it can safely restart testing and proceed towards its 15 km (~9.5 mi) launch debut. Additionally, SpaceX’s lack of valve control likely means that the company will have to wait at least 24+ hours before workers can safely return to the launch pad and begin those inspections and repairs.

Update: The roadblock was removed around 11pm local time and SpaceX workers appear to have already returned to the pad, signifying that Starship SN8 has been fully detanked and is safe to approach. Inspections and repairs will likely begin as soon as possible.

Eric Ralph is Teslarati's senior spaceflight reporter and has been covering the industry in some capacity for almost half a decade, largely spurred in 2016 by a trip to Mexico to watch Elon Musk reveal SpaceX's plans for Mars in person. Aside from spreading interest and excitement about spaceflight far and wide, his primary goal is to cover humanity's ongoing efforts to expand beyond Earth to the Moon, Mars, and elsewhere.

Advertisement
Comments

News

SpaceX launches Ax-4 mission to the ISS with international crew

The SpaceX Falcon 9 launched Axiom’s Ax-4 mission to ISS. Ax-4 crew will conduct 60+ science experiments during a 14-day stay on the ISS.

Published

on

spacex-ax-4-mission-iss
(Credit: SpaceX)

SpaceX launched the Falcon 9 rocket kickstarting Axiom Space’s Ax-4 mission to the International Space Station (ISS). Axiom’s Ax-4 mission is led by a historic international crew and lifted off from Kennedy Space Center’s Launch Complex 39A at 2:31 a.m. ET on June 25, 2025.

The Ax-4 crew is set to dock with the ISS around 7 a.m. ET on Thursday, June 26, 2025. Axiom Space, a Houston-based commercial space company, coordinated the mission with SpaceX for transportation and NASA for ISS access, with support from the European Space Agency and the astronauts’ governments.

The Ax-4 mission marks a milestone in global space collaboration. The Ax-4 crew, commanded by U.S. astronaut Peggy Whitson, includes Shubhanshu Shukla from India as the pilot, alongside mission specialists Sławosz Uznański-Wiśniewski from Poland and Tibor Kapu from Hungary.

“The trip marks the return to human spaceflight for those countries — their first government-sponsored flights in more than 40 years,” Axiom noted.

Advertisement

Shukla’s participation aligns with India’s Gaganyaan program planned for 2027. He is the first Indian astronaut to visit the ISS since Rakesh Sharma in 1984.

Axiom’s Ax-4 mission marks SpaceX’s 18th human spaceflight. The mission employs a Crew Dragon capsule atop a Falcon 9 rocket, designed with a launch escape system and “two-fault tolerant” for enhanced safety. The Axiom mission faced a few delays due to weather, a Falcon 9 leak, and an ISS Zvezda module leak investigation by NASA and Roscosmos before the recent successful launch.

As the crew prepares to execute its scientific objectives, SpaceX’s Ax-4 mission paves the way for a new era of inclusive space research, inspiring future generations and solidifying collaborative ties in the cosmos. During the Ax-4 crew’s 14-day stay in the ISS, the astronauts will conduct nearly 60 experiments.

“We’ll be conducting research that spans biology, material, and physical sciences as well as technology demonstrations,” said Whitson. “We’ll also be engaging with students around the world, sharing our experience and inspiring the next generation of explorers.”

SpaceX’s Ax-4 mission highlights Axiom’s role in advancing commercial spaceflight and fostering international partnerships. The mission strengthens global space exploration efforts by enabling historic spaceflight returns for India, Poland, and Hungary.

Advertisement
Continue Reading

News

Watch the first true Tesla Robotaxi intervention by safety monitor

Watch the first Tesla Robotaxi intervention by a safety monitor.

Published

on

Credit: Dave Lee

Nearly 60 hours into the launch of the Tesla Robotaxi platform, it appears we have our first true intervention that required the in-car safety monitor to intervene.

We’ve seen and heard about a handful of minor issues with the Robotaxi fleet thus far, one of which included a risky, but very human-like behavior of navigating across yellow lines to a turn lane after missing a turn.

While that is not necessarily a legal maneuver, it is something that you’d see commonly from human drivers, and although aggressive, it is sometimes reasonable to perform depending on traffic conditions.

For what it’s worth, the car seemed very confused by the situation, and while the safety monitor did not get involved and the car handled the situation with no real issue, it is something as a rider you’d like to see less of.

First Look at Tesla’s Robotaxi App: features, design, and more

As previously stated, that specific example did not require any intervention by a safety monitor. On Tuesday, we saw a video of the first true intervention that required the safety monitor who sits in the passenger seat to intervene by pressing a button on the center touchscreen.

During a ride that Tesla investor and YouTuber Dave Lee was taking in Austin in a Robotaxi, the vehicle seemed to get a little confused by a UPS truck that was parallel parking in front of it. The monitor pressed the “Stop in Lane” button on the touchscreen:

This appears to be one of the first errors shared by Tesla Robotaxi Early Access Program users that required the monitor to actually intervene. We have not seen any of it yet. You could also see the UPS truck is also a bit at fault here, as the space it pulled into did not seem even remotely large enough to fit the entire vehicle.

The car may not have anticipated that the truck would park there. You can see how the UPS truck was parked below, and it seems reasonable that the Tesla might not have thought it would attempt to fit there:

Credit: Dave Lee

The Model Y’s steering wheel was also turning sharply right into this spot, it appears. Dave ended his ride here, and stated that this was his dropoff spot. The UPS truck might have just cut off the Tesla, which led to the intervention.

It is a testament to Tesla’s strategy with this Robotaxi rollout. The company is obviously confident enough in the Full Self-Driving suite that it does not feel a human needs to be in the driver’s seat. However, it is still requiring someone, as of now, to sit in the passenger’s seat for instances just like this one.

Safety is the company’s priority with the launch of Robotaxi, and CEO Elon Musk has reiterated that. It is expected that we’d eventually see some kind of intervention that requires a monitor to step in. Everyone was safe.

Obviously, these things happen with autonomous vehicles. We’ve seen Waymos get stuck at intersections in very strange scenarios at times:

It is proof that autonomous tech is still in a growth phase and engineers are still learning about its capabilities. Tesla and other companies will learn from these rare cases and become better companies, and offer safer technologies because of it.

Continue Reading

News

Tesla removed from Charlotte’s approved EV list due to ‘safety issues’

City reps say it’s not because of Elon Musk’s political involvement, but instead because of safety issues.

Published

on

Credit: Tesla

Tesla has been removed from the Charlotte, North Carolina, City Council’s list of pre-approved electric vehicles that the city can purchase.

It’s not because of Elon Musk, Democratic council member LaWana Mayfield said, who urged her colleagues to remove Tesla. Instead, she claims it is because of “safety issues.”

She said (via WFAE):

“So it is not just the particular owner of this product. It is the fact that this product has been in multiple lawsuits because of safety issues, and there are multiple concerns.”

Recent data from Tesla shows that its vehicles are about half as likely to be involved in an accident when being driven normally. When Autopilot technology is used, it is about ten times safer than the average driver in the U.S., statistically.

Tesla Vehicle Safety Report shows Autopilot is 10x better than humans

Republican City Council member Ed Driggs stood up for Tesla, saying that:

“I think we just set a dangerous precedent if we have reasons that aren’t related to the cost and the performance of purchased items for excluding them. We already have Teslas in the fleet.”

If they’re so dangerous, why are they already in the fleet?

The NHTSA also shows that Ford is the most recalled car company in 2025, with 81 total recalls. Tesla has just five for the year.

Driggs said to Mayfield during the meeting:

“We are not identifying names on this list. You are singling out one name on this list for political reasons. You don’t have enough data on Tesla compared to the other car companies to suggest they shouldn’t be here. I object to trying to disguise this as anything other than a politically motivated desire to not have this name on this list.”

Tesla was successfully removed by a 6-3 vote. Democrats Danté Anderson, Malcolm Graham, Renee Johnson, Victoria Watlington, and Tiawana Brown supported Tesla’s removal. Republican Edwin Peacock, along with Driggs and Democrat Dimple Ajmera, all voted no on removing Tesla.

The City of Charlotte will buy 45 new electric vehicles, and Teslas would likely be the best option. Many local law enforcement agencies across the U.S. have utilized them and have shown that the vehicles contribute to massive maintenance and cost of ownership reductions due to the lack of overall upkeep.

Tesla police fleet is saving taxpayers $80k per year on fuel costs: report

This is not the first time that a city in the U.S. has chosen to go in a different direction with its EV fleet plans. Tesla was chosen over Ford by the City of Baltimore for a $5 million expenditure that would bolster its fleet with EVs.

However, earlier this year, Baltimore said it “decided to go in a different direction,” and although it was not directly confirmed, the move seemed to be political.

Continue Reading

Trending