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SpaceX Starship test tank set for destructive finale after ‘cryo proof’

SpaceX is set to intentionally destroy another Starship test tank on the path to orbital launches. (NASASpaceflight - bocachicagal)

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SpaceX’s fourth Starship test tank is set for a destructive finale after completing a “cryo proof” pressure test on Thursday.

SpaceX’s newest Starship test tank – SN7.1 – is the second in a series of two planned prototypes, both designed to test the viability of using a new steel alloy to build future Starships and Super Heavy boosters. CEO Elon Musk says that SpaceX is technically customizing its own steel alloy for Starship production but Musk’s comments and the results from SN7 testing in June 2020 point towards an offshoot of 304L with minor metallurgical tweaks.

Prior to SN7’s test campaign, Musk revealed that the main goal of the new alloy was to reduce the brittleness of Starship tanks and any adjacent steel components under cryogenic conditions (i.e. extreme cold). Ultimately, SN7 appeared to confirm that the new alloy’s behavior was far more forgiving under cryogenic loads, reaching what were believed to be record pressures before the tank finally burst on June 24th.

Following in SN7’s footsteps, SN7.1 is much closer to an actual Starship prototype.

“SN7.1 is significantly more complex than its sibling and will test a ~304L Raptor mount (thrust puck) and skirt section. The forces and general conditions those new parts will be subjected to are substantially different than most of what SN7 was subjected to, meaning that there is a chance that 304L steel is actually worse in some scenarios.

With any luck, though, SN7.1’s test campaign – scheduled to begin as early as 9pm CDT (UTC-5), September 10th – will be a flawless success, proving that SpaceX’s new steel alloy is superior to 301 for all Starship-related applications. If that’s the case, Starship SN8 – the first full new-alloy prototype – will likely be fully outfitted with a nosecone and header tanks before beginning acceptance testing later this month.”


Teslarati.com — September 10th, 2020

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For SN7.1, increased ductility could theoretically be a mixed bag. Assuming SpaceX has also built the thrust puck out of 304L-adjacent steel, it may end up being too squishy under the extreme forces it will be subjected to. At full throttle, the thrust of three Raptor engines will compress the thrust puck – a cone with dimensions roughly the same as a large circular table – with the equivalent force of a ~600 metric ton (1.3 million lb) weight.

On September 10th, SpaceX put SN7.1 through its paces, performing a cryogenic proof test with liquid nitrogen (LN2) while the tank was still installed on the simple steel frame used to support it during production and transport. That simple decision offers a brief glimpse at the extensive planning that allows SpaceX to optimize for speed and efficiency while still conducting successful tests. While SpaceX could have technically installed SN7.1 directly onto a brand new launch mount custom-built for the exact kind of testing expected, the company instead left the tank on its build stand – much cheaper and far easier to replace than the former.

Technically, moving directly to the launch mount would have slightly simplified the test process, but a tank rupture during a routine cryogenic proof test could have extensively damaged or destroyed the mount, requiring weeks of work to build a full replacement. After SN7.1 successfully completed a cryogenic pressure test on September 10th, SpaceX simply lifted it off its work stand and installed it on a custom-built launch mount.

A partial view of Starship SN7.1’s work stand (center) and a more complex, expensive launch mount and test stand (left). (NASASpaceflight – bocachicagal)

As early as 9pm CDT (UTC-5) on September 14th, SpaceX will once again load SN7.1 with liquid nitrogen. This time around, the tank – after reaching flight pressures of 7.5 to 8+ bar (110-120+ psi) – will be subjected to the simulated thrust of three Raptor engines by a series of hydraulic rams. Based on a public schedule of road closures, at least two tests are planned. The first will likely put SN7.1 through a range of Raptor thrust scenarios and profiles under the same tank pressures needed for orbital Starship flights. If that test is successful, SpaceX may move SN7.1 back to its work stand before intentionally pressurizing the tank until it bursts sometime around September 17th.

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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 board reveals reasoning for CEO Elon Musk’s new $1 trillion pay package

“Yes, you read that correctly: in 2018, Elon had to grow Tesla by billions; in 2025, he has to grow Tesla by trillions — to be exact, he must create nearly $7.5 trillion in value for shareholders for him to receive the full award.”

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(Credit: Tesla)

Tesla’s Board of Directors has proposed a new pay package for company CEO Elon Musk that would result in $1 trillion in stock offerings if he is able to meet several lofty performance targets.

Musk, who has not been meaningfully compensated since 2017, completed his last pay package by delivering billions in shareholder value through a variety of performance-based “tranches,” which were met and resulted in the award of billions in stock.

Elon Musk’s new pay plan ties trillionaire status to Tesla’s $8.5 trillion valuation

However, Musk was unable to claim this award due to a ruling by the Delaware Chancery Court, which deemed the payout an “unfathomable sum.”

Now, the company is taking steps to ensure Musk gets paid, as the Board feels that it is crucial to retain its CEO, who has been responsible for much of the company’s success.

This is not a statement to undermine the work of all of Tesla’s terrific employees, but a ship needs to be captained by someone, and Musk has proven he is the right person for the job.

The Board also believes that, based on a statement made by the company in its proxy, various issues will be discussed during the upcoming Shareholder Meeting.

Robyn Denholm and Kathleen Wilson-Thompson recognized Musk’s contributions in a statement, which encouraged shareholders to vote to approve the payout:

“We’re asking you to approve the 2025 CEO Performance Award. In designing the new performance award, we explored numerous alternatives. Ultimately, the new award aims to build upon the success of the 2018 CEO Performance Award framework, which ensure that Elon was only paid for the performance delivered and incentivized to guide Tesla through a period of meteoric growth. The 2025 CEO Performance Award similarly challegnes Elon to again meet a series of even more aspirational goals, including operational milestones focused on reaching Adjusted EBITDA targets (thresholds that are up to 28 times higher than the 2108 CEO Performance Award’s top Adjusted EBITDA milestone) and rolling out new or expanded product offerings (including 1 million Robotaxis in commercial operation and delivery of 1 million AI Bots), all while growing the company’s market capitalization by trillions of dollars.

Yes, you read that correctly: in 2018, Elon had to grow Tesla by billions; in 2025, he has to grow Tesla by trillions — to be exact, he must create nearly $7.5 trillion in value for shareholders for him to receive the full award.

In addition to these unprecedented performance milestones, the 2025 CEO Performance Award also includes innovative structural features, born out of the special committee’s considered analysis and extensive shareholder feedback. These features include supercharged retention (at least seven and a half years and up to 10 years to vest in the full award), structural protections to minimize stock price volatility due to administration of this award and, thereafter, incentives for Elon to participate in the Board’s continued development of a framework for long-term CEO Succession. If Elon achieves all the performance milestones under this principle-based 2025 CEO Performance Award, his leadership will propel Tesla to become the most valuable company in history.”

Musk will have a lot of things to accomplish to receive the 423,743,904 shares, which are divided into 12 tranches.

However, the Board feels he is the right person for the job, and they want him to remain the CEO. This package should ensure that he stays with Tesla, as long as shareholders feel the same way.

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Tesla Robotaxi app download rate demolishes Uber, Waymo all-time highs

After two and a half months of testing with a group of hand-picked Tesla influencers and some media, the company has officially launched Robotaxi rides in both Austin, Texas, and the California Bay Area to the public.

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Credit: @BLKMDL3 | X

Tesla launched its Robotaxi app to the general public yesterday, and the number of downloads is a testament to the platform’s high demand for testing.

After two and a half months of testing with a group of hand-picked Tesla influencers and some media, the company has officially launched Robotaxi rides in both Austin, Texas, and the California Bay Area to the public.

Tesla Robotaxi makes major expansion with official public app launch

Downloading the app is available to iOS users, so if you have an iPhone, you can get it and join the waitlist. Tesla has not yet launched the Robotaxi app for the Android platform, but did hint that it would be coming soon.

The testing phase with the group Tesla selected has gone well. In Austin, the City has only listed one “Safety Concern” with Robotaxi during the testing phase. For the most part, things have gone extremely well, and riders have had good things to say.

Tesla is still operating with some safeguards in place, such as Safety Monitors and Safety Drivers, but these are precautionary and temporary; CEO Elon Musk has said they should be removed by the end of the year.

Elon Musk says Tesla will take Safety Drivers out of Robotaxi: here’s when

Even still, Tesla Robotaxi is something that many people want to experience, and the app downloads prove it.

The Tesla Robotaxi app was downloaded at a rate that exceeded all rolling 30-day periods of both Uber and Waymo, according to Brett Winton of ARK Invest. Tesla’s Robotaxi’s first day on the App Store exceeded Uber’s by 40 percent and Waymo’s best download day ever by six times:

The surge in downloads is a good indication of how in demand the Robotaxi suite was, as many people within the community had vocalized their requests to try the platform, but Tesla was not ready to expand it beyond its handpicked group.

The expansion of the program will result in more rides, provided Tesla continues to expand its fleet of vehicles. It has already admitted many of those who were initially placed on the waitlist.

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Elon Musk’s xAI expands to Seattle with salaries up to $440,000

The move was announced by the artificial intelligence startup and Elon Musk on social media platform X.

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(Credit: xAI)

Elon Musk’s artificial intelligence startup xAI is opening a new office in Seattle as it accelerates its global expansion. 

The move was announced by the artificial intelligence startup and Elon Musk on social media platform X. xAI is also hiring for its first positions in the new site.

New Seattle office

As could be seen on xAI’s Careers webpage, the Seattle office is currently hiring for three engineering roles. Each of the three technical roles tied to the new site carry salaries ranging from $180,000 to $440,000. 

The new office adds to xAI’s growing presence, which now spans San Francisco, Austin, London, Dublin, New York, and Memphis. The Seattle-based roles focus on video and image generation systems, signaling Musk’s intent to challenge rivals like OpenAI and Meta in generative AI.

Pressures and challenges

Seattle also places xAI within reach of Microsoft’s headquarters in Redmond. Microsoft has emerged as a central player in the AI race through its multibillion-dollar partnership with OpenAI, making xAI’s move into the region notable. The competition for AI specialists has pushed salaries higher across the industry, with filings showing OpenAI staff earning up to $530,000 and Anthropic engineers as much as $690,000 annually, as noted by Insider.

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The startup has also seen some high-profile departures in recent months, including cofounder Igor Babuschkin and general counsel Robert Keele. Still, xAI continues to grow aggressively, and its Grok large language model has been gaining momentum among mainstream users. Work also continues to be underway to further build out the company’s Colossus supercomputer cluster. Reports have also suggested that xAI has moved into San Francisco offices in the Mission District, a site Musk initially leased during OpenAI’s early years.

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