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SpaceX’s Starship program returns to its roots with a new rocket ‘test tank’

SpaceX appears to be re-upping a tried and true foundation of its Starship development with a new rocket 'test tank'. (NASASpaceflight - bocachicagal)

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5 years ago

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SpaceX’s Starship rocket development program has returned to its early-2020 roots as teams work to assemble the first new ‘test tank’ built in South Texas in more than three months.

Just like its three predecessors, the newest test tank’s purpose is relatively simple: demonstrate – at full scale – the efficacy of SpaceX’s current manufacturing processes. Back when SpaceX built and tested the first two tank prototypes in January 2020, the company was in the midst of making big changes throughout its coastal Boca Chica, Texas Starship factory – a major leap forward compared to the methods used to build Starship Mk1. While the first tank made it to 7.1 bar (~103 psi) before failing, a second tank survived all the way up to 8.5 bar (~125 psi), as did a third separate test tank built about a month later. According to CEO Elon Musk, 8.5 bar is more than satisfactory for Starship pressure vessels to safely launch humans into orbit, offering a safety margin of more than 40%.

Most recently, Starship SN4 became the first full-scale prototype to replicate the results SpaceX achieved with its shorter test tanks, effortlessly reaching 7.5 bar (~110 psi) during a cryogenic pressure test completed just last month. Despite those myriad successes, however, SpaceX rarely stops moving forward and Musk has already hinted at improvements the company may be hoping to prove out with a fourth Starship test tank.

SpaceX appears to be re-upping a tried and true foundation of its Starship development with a new rocket ‘test tank’. (NASASpaceflight – bocachicagal)

The most obvious reason to build a new test tank after the success of full-scale Starship prototype SN4 is a substantial change in the steel alloy SpaceX is building rockets out of in South Texas. CEO Elon Musk has teased such a shift for almost a full year and it appears to have happened right on time – if not ahead of schedule. SpaceX currently uses 301 stainless steel for Starship production, while the new material – discussed earlier by Musk and confirmed by inscriptions on the exterior of what would later become the fourth test tank – is a slightly different 304 steel “with higher ductility” (malleability).

What was initially was initially labeled “SN7” later became the fourth Starship test tank in June 2020. (NASASpaceflight – bocachicagal)

It’s unclear if this is the custom-built “30X” alloy SpaceX was planning on creating, given that “304L” steel is an already-available commodity material that is slightly more durable and corrosion-resistant but less ductile and ~10% more expensive than 301. Regardless, changing to a new alloy would almost certainly benefit from real-world testing to confirm that behaves in the ways SpaceX expects it to, while also verifying that existing fabrication methods (particularly welding) still suffice.

Test Tank #1, January 9th, 2020. (NASASpaceflight – bocachicagal)
Test Tank #4 – also known as Starship SN7 – is pictured here on June 5th. (NASASpaceflight – bocachicagal)

The only other notable visual differences between Starship Test Tank #4 and its predecessors are small changes in welding. On the new tank’s dome and ring, SpaceX has removed wavy strips of metal known as a weld doublers, used to strengthen vertical welds on all previous ships and test tanks. While only realizing miniscule weight savings, the change is a visual confirmation that SpaceX is growing more confident in its weld quality, perhaps also signifying the introduction of a new kind of welding.

Last but not least, the circumferential weld joining Test Tank #4’s dome and ring (a dark horizontal line) appears to be centered on the ring, whereas the domes of previous ships and tanks have typically been attached to the upper or lower 20-30% of their respective rings. The purpose of this change is unknown.

Regardless, Test Tank #4 is currently in the midst of an hours-long cryogenic proof test and appears to be almost fully loaded with several hundred tons of liquid nitrogen. Check out the frosty tank live at the link below as we wait to see if the Starship hardware survives.

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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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Cybertruck

Elon Musk says this common Tesla Cybertruck issue is ‘major area of focus’

Since Tesla initiated deliveries of the Cybertruck nearly two years ago, the company has gone through its growing pains with the vehicle, some more publicized than others.

Published

7 minutes ago

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September 19, 2025

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Credit: @samsheffer | x

Elon Musk said this afternoon on X that a commonly reported issue with the Tesla Cybertruck is a “major area of focus” for the company.

Since Tesla initiated deliveries of the Cybertruck nearly two years ago, the company has gone through its growing pains with the vehicle, some more publicized than others.

However, the simple yet annoying issues that owners encounter through thousands of miles of driving do not receive as much attention, even though they are likely more pertinent and frequently encountered by owners.

One of those problems is with the central windshield Full Self-Driving camera, which sits inside a housing at the top of the glass, enabling Tesla Vision to have an uninterrupted view of the traffic and surroundings ahead of the pickup.

Credit: @samsheffer | x

Many owners have reported that their vehicles alert them when Full Self-Driving is unavailable due to an obstruction with this camera. Commonly, it is caused by a buildup of condensation, which creates a haze on the camera and obstructs its view.

Tesla suggests a quick cleaning of the housing and cameras, which resolves the problem. Still, owners are not necessarily ecstatic about having to do this themselves.

Tesla developing more comprehensive Cybertruck camera cleaning system

Musk says that Tesla is attempting to fix the issue, and said in response to one owner who performed the maintenance that it was a “major area of focus” for the company:

While many were enthusiastic about the potential fix, but some complained that their cars had been in for service many times for the issue, inhibiting their ability to utilize FSD and truly enjoy the full experience of owning a Tesla.

It will likely be a hardware fix that will be implemented through a service appointment, but knowing Tesla, they could have something up their sleeve through a software update to resolve the issue.

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Tesla’s Lead of Optimus AI departs and people are confused about it

Kumar, who has been with Tesla for just over two years, made his announcement on X, revealing he was taking a role at Meta as a Research Scientist.

Published

2 hours ago

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September 19, 2025

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Credit: @heydave7/X

Tesla’s Lead of Optimus AI, Ashish Kumar, is departing the company, and people sure are confused about it.

Kumar, who has been with Tesla for just over two years, made his announcement on X, revealing he was taking a role at Meta as a Research Scientist.

He said:

“Decided to leave Tesla. It’s been an incredible ride leading the Optimus AI team. We went all-in on scalable methods — swapping the classical stack with reinforcement learning & scaling dexterity by learning from videos. AI is the most significant bit to unlock humanoids.”

Tesla fans were baffled by Kumar’s decision, immediately questioning his choice, with many wondering why he’d leave Elon Musk for Mark Zuckerberg.

Some said the choice had to be financially motivated, but Kumar said it was not, and if money were the driving factor, he would have stayed at Tesla:

Others were grateful for Kumar’s contributions to the company and were very respectful regarding his decision:

It’s possible that Kumar chose to leave Tesla for more reasons than one, and financial reasons do not appear to be the issue, as he admitted. However, it could be a better work-life balance at Meta, or perhaps there is an internal project that simply interests him more.

Tesla will be okay, and Optimus will continue to improve with a new Lead in that position. We wish Ashish the best of luck in his new role, and we are thankful for what he contributed to the Optimus program.

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Elon Musk

Elon Musk: Tesla shareholder vote results could “affect the future of the world”

“This shareholder vote decides the future of Tesla and may affect the future of the world,” Musk posted on X.

Published

3 hours ago

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September 19, 2025

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MINISTÉRIO DAS COMUNICAÇÕES, CC BY 2.0 , via Wikimedia Commons

Elon Musk is urging Tesla shareholders to take part in the company’s upcoming annual meeting, calling the vote critical not just for the automaker but potentially for the world. 

“This shareholder vote decides the future of Tesla and may affect the future of the world,” Musk posted on X, emphasizing the importance of proposals that will be voted on in the upcoming meeting on November 6, 2025.

A pivotal inflection point

In a message from its official account, Tesla described itself as being at “a critical inflection point” as it prepares for its annual meeting. Shareholders will soon receive voting instructions, with the company asking investors to back the Board’s recommendations on all proposals. The post also referenced Tesla’s Master Plan Part IV, which outlines ambitious growth targets across vehicles, energy, and artificial intelligence.

“Tesla is at a critical inflection point. We need your vote ahead of our 2025 Annual Meeting on November 6. Tesla shareholders, the owners of our company, will soon receive their control numbers and voting instructions from their brokers. This will enable you to vote. We are asking you to vote with the Board’s recommendations on *all* proposals,” Tesla wrote in its post.

The company also highlighted that it is currently on the brink of a “massive wave of transformational growth.” Tesla stressed that confidence in Musk’s leadership is central to this trajectory, as he is the CEO who could lead Tesla into its new, ambitious era.

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Some Key proposals

Two proposals stand out in Tesla’s recommendations, as per the company’s VoteTesla.com website. The first seeks to amend and restate Elon Musk’s 2019 Equity Incentive Plan, creating a special reserve of nearly 208 million shares to give the board flexibility amid ongoing litigation surrounding Musk’s 2018 CEO Performance Award. It also calls for replenishing the general share reserve with 60 million additional shares, ensuring capacity for employee equity grants.

“Equity is the cornerstone of Tesla’s compensation philosophy. We believe we need a framework that allows us to honor the deal we made with Elon and the extraordinary value he created for Tesla shareholders under the 2018 CEO Performance Award. In addition, it is essential that we maintain sufficient equity reserves and maximum flexibility to attract, retain and motivate talent at Tesla,” Tesla wrote.

The second proposal is a new 2025 CEO Performance Award, a pay-for-performance framework that links Musk’s compensation to reaching ambitious market cap and operational milestones. Under the plan, Musk would earn nothing unless Tesla achieves extraordinary results, potentially creating more than $7 trillion in shareholder value and pushing the company’s valuation to as high as $8.5 trillion. The company also asked shareholders to vote in favor of re-electing three directors: Ira Ehrenpreis, Joe Gebbia, and Kathleen Wilson-Thompson.

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