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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 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.
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.
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.
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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Tesla gets price target increase on Wall Street, but it’s a head-scratcher
Delaney’s price target on Tesla shares went up to $395 from $300. Currently, Tesla is trading between $420 and $430, making the new price target from Goldman Sachs a bit of a head-scratcher.
Tesla (NASDAQ: TSLA) received a price target increase from a Wall Street analyst today, who noted in his report that the company’s shares could rise or fall based on its execution in robotics and autonomy.
However, the price target boost still fell below Tesla’s current trading levels.
Mark Delaney of Goldman Sachs said in a note to investors today that Tesla has a significant opportunity to solidify itself as one of the stable and safe plays in the market if it can execute on its two key projects: humanoid robots and autonomy.
In the note, Delaney said:
“If Tesla can have [an] outsized share in areas such as humanoid robotics and autonomy, then there could be upside to our price target.”
Delaney’s price target on Tesla shares went up to $395 from $300. Currently, Tesla is trading between $420 and $430, making the new price target from Goldman Sachs a bit of a head-scratcher.
He went on to say that Tesla could also confront outside factors that would limit the stock’s ability to see growth, including competition and potentially its own lack of execution:
“…although if competition limits profits (as is happening with the ADAS market in China) or Tesla does not execute well, then there could be downside.”
The note is an interesting one because it seems to point out the blatantly obvious: if Tesla performs well, the stock will rise. If it doesn’t, the stock price will decline.
We discussed yesterday in an article that Tesla is one of the few stocks out there that does not seem to be influenced by financials or anything super concrete. Instead, it is more influenced by the narrative currently surrounding the company, rather than the technicals.
Tesla called ‘biggest meme stock we’ve ever seen’ by Yale associate dean
Tesla’s prowess in robotics and autonomy is strong. In robotics, it has a very good sentiment following its Optimus project, and it has shown steady improvement with subsequent versions of the robot with each release.
On the autonomy front, Tesla is expanding its Robotaxi platform in Austin every few weeks, and also has a sizeable geofence in the Bay Area. Its Full Self-Driving suite is among the most robust in the world and is incredibly useful and accurate.
The company can gain significant value if it continues to refine the platform and eventually rolls out a driverless or unsupervised version of the Full Self-Driving suite.
Elon Musk
Tesla addresses door handle complaints with simple engineering fix
“We’ll have a really good solution for that. I’m not worried about it.”
Tesla is going to adjust one heavily scrutinized part of its vehicles after recent government agencies have launched probes into an issue stemming from complaints from owners.
Over the past few days, we have reported on the issues with Tesla’s door handle systems from both the Chinese and American governments.
In China, it dealt with the Model S, while the United States’ National Highway Traffic Safety Administration (NHTSA) reported nine complaints from owners experiencing issues with 2021 Model Ys, as some said they had trouble entering their car after the 12V battery was low on power.
Bloomberg, in an interview with Tesla Chief Designer Franz von Holzhausen, asked whether the company planned to adjust the door handle design to alleviate any concerns that regulatory agencies might have.
Regarding the interior latch concerns in the United States:
- Von Holzhausen said that, while a mechanical door release resolves this problem, Tesla plans to “combine the two” to help reduce stress in what he called “panic situations.”
- He also added that “it’s in the cars now…The idea of combining the electronic and the manual one together in one button, I think, makes a lot of sense.” Franz said the muscle memory of reaching for the same button will be advantageous for children and anyone who is in an emergency.
Regarding the exterior door handle concerns in China:
- Von Holzhausen said Tesla is reviewing the details of the regulation and confirmed, “We’ll have a really good solution for that. I’m not worried about it.”
Franz von Holzhausen (from Tesla’s Robovan) on Tesla’s upcoming redesigned door handles: pic.twitter.com/lnaKve1SlJ
— Sawyer Merritt (@SawyerMerritt) September 17, 2025
The new Model Y already has emergency mechanical door release latches in the back, but combining them in future vehicles seems to be an ideal solution for other vehicles in Tesla’s lineup.
It will likely help Tesla avoid complaints from owners about not having an out in the event of a power outage or accident. It is a small engineering change that could be extremely valuable for future instances.
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Elon Musk calls out viral claim of 10,000 Tesla Optimus deal: “Fake”
For now at least, Tesla seems determined to focus on the development of Optimus V3.
Elon Musk has provided some clarification to recent reports suggesting that PharmAGRI, a US pharmaceutical and agricultural infrastructure company, is looking to deploy 10,000 Optimus robots for its operations.
Musk posted his clarification on social media platform X.
Alleged Optimus purchase
Recently, reports emerged stating that PharmAGRI Capital Partners will be tapping into Tesla’s humanoid robots for its operations. The firm claimed that it had executed a Letter of Intent with Tesla to deploy up to 10,000 Optimus Gen 3+ humanoid robots across its SuperPharm and CEA facilities. This should allow the company to automate its labor and ensure diversion control.
A comment from Lynn Stockwell, Chairwoman & CEO, suggested that the company really was partnering with Tesla. “With Tesla robotics powering our facilities and DEA-licensed infrastructure in place, we can scale with precision, meet federal sourcing mandates, and deliver therapies that are compliant, secure, and American-made,” she said.
Elon Musk clariies
News of PharmAGRI’s Optimus claims quickly spread on social media, though some Tesla watchers argued that it seemed unlikely that the EV maker will commit two legions of Optimus robots to a rather unknown company this early. Some pointed out that Tesla typically commits to high-profile customers to test its early products, such as PepsiCo with the Tesla Semi.
Photos from PharmAGRI’s website depicting Tesla Optimus bots, as well as the rather basic look of the website itself, also brought more reservations to the company’s claims. Ultimately, Elon Musk weighed in on the matter, responding to a post about PharmAGRI’s Optimus-filled webpage. Musk was quick and direct, simply stating, “Fake.”
Elon Musk’s comments were quite unsurprising considering that Optimus is still very much in active development, and thus, it is quite unlikely that the company is already taking orders or even Letters of Intent from potential customers at this time. For now at least, Tesla seems determined to focus on the development of Optimus V3, which Musk has noted will be “sublime.”
Tesla gets price target increase on Wall Street, but it’s a head-scratcher
Tesla addresses door handle complaints with simple engineering fix
Elon Musk calls out viral claim of 10,000 Tesla Optimus deal: “Fake”
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