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SpaceX Starship test tank survives first two nights of stress testing

SpaceX's newest Starship test tank has survived the first round of stress testing. SN2 - very similar to SN7.1 - is pictured here in March 2020. (NASASpaceflight - bocachicagal)

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SpaceX’s newest Starship test tank has survived the first two nights of stress testing, pushing the steel tank one step closer to a destructive finale.

Known as Starship SN7.1, the new tank – aside from one critical difference – is similar to Starship SN2 (pictured above), a full-scale prototype SpaceX repurposed into a test tank in March 2020. SN2 served to test improvements made to the design of Starship’s “thrust puck,” a dense steel cone that must transmit the thrust of three Raptor engines through the rest of the rocket. Much like SN2, SN7.1 is a test tank with a focus on the behavior of Starship’s engine section under extreme loads at cryogenic temperatures.

Unlike SN2, however, SN7.1 is built almost entirely out of a new steel alloy – closer to 304L than the 301 stainless used on all previous prototypes.

SN2, July 2020. (NASASpaceflight – bocachicagal)
Design-wise, SN7.1 is almost identical to SN2. (NASASpaceflight – bocachicagal)

SpaceX rolled the tank to the launch site and pressurized it with cryogenic liquid nitrogen on September 10th as part of a routine “cryo proof” acceptance test. SN7.1 appeared to complete that proof without issue, exhibiting no leaks or unusual behavior, and likely reached pressures of 7.5-8 bar (~110-120 psi) before detanking.

Over the next three days, SpaceX inspected the test tank, relocated it to a more capable (and expensive) test stand, and connected hydraulic rams (used to mechanically simulate engine thrust) to its thrust puck.

While SpaceX never confirmed results, Starship test tank SN7 is believed to have broken pressure records before it burst, a strong sign that the new steel alloy is the superior choice for future prototypes. (NASASpaceflight – bocachicagal

Around midnight on September 15th, SpaceX kicked off the first round of SN7.1 stress testing, repeatedly loading and unloading the tank with liquid nitrogen. While it’s impossible to visually confirm the use of the stand’s hydraulic rams, it’s safe to assume that SpaceX used them to stress SN7.1’s thrust puck while chilled to cryogenic temperatures. The new steel alloy SpaceX is using on SN7.x and prototypes SN8 and beyond is designed to be less brittle at cryogenic temperatures, nominally ensuring that flawed or aged Starship tanks leak before they burst or explode.

Aside from the obvious triple-Raptor thrust simulation, SpaceX likely also simulated thrust from one or two Raptors to verify the new design’s ability to survive asymmetric thrust in engine-out scenarios. Ultimately, SN7.1 made it through the night without obvious issues and there have been no signs of leak-fixing today, suggesting that the tank performed well. SpaceX has a second SN7.1 test period scheduled to begin on September 17th, as well as backups on the 15th, 16th, 20th, and 21st. More likely than not, SN7.1’s next test will end when the tank is intentionally pressurized to failure.

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Update: SpaceX has kicked off another night of SN7.1 stress testing, beginning almost as soon as the nine-hour window opened (9pm CDT (UTC-5) on September 15th). As of midnight, the company has already put the test tank through one cycle, rapidly filling and pressurizing it with liquid nitrogen before detanking. It remains to be seen if the company will continue testing this window, which closes at 6am on Wednesday. There is also a chance that SpaceX will intentionally pressurize SN7.1 to failure tonight, although it’s much more likely that the tank will be returned to a cheaper, simpler transport stand rather than risking damage to a new launch mount.

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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.

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Tesla Model Y has become the most common vehicle in Norway

The Tesla Model Y passed more than 70,000 registrations recently.

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Credit: Tesla

The Tesla Model Y has become the most common car on Norwegian roads. This is a remarkable achievement for the all-electric crossover, which has also commanded the top spot in Norway’s vehicle sales rankings for several years running.

Model Y Domination

As per vehicle registration figures tracked by the Norwegian Road Traffic Information Council (OFV), there were 68,378 Model Ys with Norwegian license plates at the end of March/beginning of April 2025. In recent weeks, the Model Y passed more than 70,000 registrations, as per a report from Elbil24.

With the Model Y now becoming the most common car in Norway, the Toyota Rav4 now stands in second place, followed by the Nissan Leaf, the Volkswagen Golf, and the Toyota Yaris. The Model Y also topped the country’s vehicle registration rankings for the last three years, and it set a record for selling the most vehicles in a year in 2023, breaking the Volkswagen Beetle’s record that has stood since 1969.

Possibly More Momentum

It is undeniable that the Tesla Model Y has helped Norway push its electric vehicle transition. As of date, electric vehicles now account for 28% of the Norwegian car fleet, a notable portion of which is comprised of the all-electric crossover.

While the Model Y’s achievements in Norway have been impressive, the vehicle could expand its reach into the country even more this year. Tesla, after all, has been aggressively pushing the new Model Y to consumers, with the company offering a zero percent interest promotion for the vehicle. These efforts, as well as the new Model Y’s improved features, should make the vehicle even more compelling to Norwegian car buyers this year.

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Tesla Board Chair slams Wall Street Journal over alleged CEO search report

Denholm’s comments were posted by Tesla on its official account on social media platform X.

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robyn-m-denholm-tesla
CeBIT Australia, CC BY 2.0 , via Wikimedia Commons

Tesla Board Chair Robyn Denholm has issued a stern correction to The Wall Street Journal after the publication posted a report alleging that the electric vehicle maker’s Board of Directors opened a search for a new CEO to replace Elon Musk.

Denholm’s comments were posted by Tesla on its official account on social media platform X. 

The WSJ’s Allegations

Citing people reportedly familiar with the discussions, the WSJ alleged that Tesla Board members reached out to several executive search firms to work on a formal process for finding Elon Musk’s successor. The publication also alleged that tensions had been mounting at Tesla due to the company’s dropping sales and profits, as well as the time Musk has been spending with DOGE.

The publication also alleged that Elon Musk had met with the Tesla Board about the matter, and that members told the CEO that he needed to spend more time on Tesla. Musk was reportedly instructed to state his intentions publicly as well. The CEO did not push back against the Board, the WSJ claimed. 

Elon Musk did announce that he is stepping back from his day-to-day role at the Department of Government Efficiency during the Tesla Q1 2025 earnings call. Musk’s announcement was embraced by Tesla investors and analysts, many of whom felt that the CEO’s renewed focus on the EV maker could push the company to greater heights. 

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Tesla and Musk’s Response

In response to The Wall Street Journal’s report, Tesla’s official account on X shared a comment from its Board Chair. In her comment, Denham noted that the WSJ‘s report was “absolutely false.” She also highlighted that Tesla had communicated this fact to the publication before the report was published, but the Journal ran the story anyway.

“Earlier today, there was a media report erroneously claiming that the Tesla Board had contacted recruitment firms to initiate a CEO search at the company. This is absolutely false (and this was communicated to the media before the report was published). The CEO of Tesla is Elon Musk and the Board is highly confident in his ability to continue executing on the exciting growth plan ahead,” Denholm stated.

Elon Musk himself commented on the matter, stating that the publication showed an “extremely bad breach of ethics” since the report did not even include the Tesla Board of Directors’ denial of the allegations. “It is an EXTREMELY BAD BREACH OF ETHICS that the WSJ would publish a DELIBERATELY FALSE ARTICLE and fail to include an unequivocal denial beforehand by the Tesla board of directors!” Musk wrote in a post on X.

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Elon Musk

Elon Musk is now a remote DOGE worker: White House Chief of Staff

The Tesla and SpaceX CEO Elon Musk is no longer working from the West Wing.

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Credit: Elon Musk/X

In a conversation with the New York Post, White House Chief of Staff Susie Wiles stated that Tesla and SpaceX CEO Elon Musk is no longer working from the West Wing.

As per the Chief of Staff, Musk is still working for DOGE—as a remote worker, at least.

Remote Musk

In her conversation with the publication, Wiles stated that she still talks with Musk. And while the CEO is now working remotely, his contributions still have the same net effect. 

“Instead of meeting with him in person, I’m talking to him on the phone, but it’s the same net effect,” Wiles stated, adding that “it really doesn’t matter much” that the CEO “hasn’t been here physically.” She also noted that Musk’s team will not be leaving.

“He’s not out of it altogether. He’s just not physically present as much as he was. The people that are doing this work are here doing good things and paying attention to the details. He’ll be stepping back a little, but he’s certainly not abandoning it. And his people are definitely not,” Wiles stated.

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Back to Tesla

Musk has been a frequent presence in the White House during the Trump administration’s first 100 days in office. But during the Q1 2025 Tesla earnings call, Musk stated that he would be spending substantially less time with DOGE and substantially more time with Tesla. Musk did emphasize, however, that DOGE’s work is extremely valuable and critical.

“I think I’ll continue to spend a day or two per week on government matters for as long as the President would like me to do so and as long as it is useful. But starting next month, I’ll be allocating probably more of my time to Tesla and now that the major work of establishing the Department of Government Efficiency is done,” Musk stated.

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