News
SpaceX first Super Heavy ‘test tank’ is almost ready for prime time
SpaceX has almost completed a ‘test tank’ meant to ensure that Starship’s Super Heavy booster is capable of withstanding the immense thrust of more than two-dozen Raptor engines.
Believed to be known as test tank BN2.1, the prototype’s latest appearance comes on the heels of news from CEO Elon Musk that SpaceX has upgraded Super Heavy with one extra Raptor engine – with plans to add another three down the road. The results of that tank’s imminent test campaign will likely be crucial as the company shifts its focus sending Starship to orbit (or close) as soon as possible.
Prior to a new Super Heavy booster ‘thrust puck’ design first spotted on May 29th, at least two separate booster engine section prototypes completed in the last few months sported an earlier variant more akin to a donut. At that point, Super Heavy’s design had a central cluster of eight gimballing, throttleable Raptors surrounded by a ring of 20 Raptor Boost (“RBoost”) engines – a variant meant to trade the ability to throttle for ~25% more thrust.
While Super Heavy booster BN1’s almost immediate scrapping – prior to a single test – guaranteed that major design changes were on the way, exactly what those changes would be was anyone’s guess. The appearance of a new booster ‘thrust puck’ design and Musk’s subsequent announcement that Super Heavy will “initially” have 29 – not 28 – Raptors likely mean that that engine section redesign was a major contributor to BN1’s instant obsolescence. The only other major change SpaceX clearly made with booster BN2 was switching the positions of its liquid methane and liquid oxygen tanks, ensuring that Super Heavy’s heavier oxidizer is closer to the rocket’s base.
Musk also stated that SpaceX will eventually upgrade Super Heavy to 32 engines, giving future boosters a central cluster of 12 engines that the SpaceX CEO says will significantly improve the efficiency of boostback burns.
With 29 identical Raptors, the simplest possible Super Heavy booster would produce up to 5800 tons (12.8M lbf) of thrust at liftoff. If SpaceX has already completed Raptor Boost’s design and qualification and kicked off mass production of a 250-mTf engine, that liftoff thrust climbs to 6800 tons (~15M lbf). If SpaceX achieves performance goals (~210 mTf stock; ~300 mTf RBoost) mentioned by Musk last year, a 32-engine Super Heavy could achieve peak liftoff thrust greater than 8500 metric tons (~18.7M lbf).
Even in its weakest configuration, Super Heavy will still be more than 60% more powerful than Saturn V and 25% more powerful than N1 – the largest rockets to have ever successfully or unsuccessfully flown. That immense thrust demands a structure capable of surviving those extreme forces while simultaneously feeding dozens of Raptors up to ~28 metric tons (~61,000 lb) of propellant every second and withstanding several thousand tons of liquid oxygen – all without leaking, cracking, or flexing too much.
While BN2.1 wont have any of the plumbing associated with dozens of Raptors, nine hydraulic rams will let SpaceX subject its Super Heavy thrust structure to the simulated thrust of some number of engines. Given the presence of nine rams and nine clustered engines, it’s unclear if BN2.1 will only test that main thrust structure or if those rams will somehow be spread out to simulate the thrust of a full 29 engines – 20 of which will instead transfer most or all of their thrust into Super Heavy’s skirt.
Regardless, if successful, BN2.1’s test campaign should leave SpaceX on track to attempt Starship’s inaugural spaceflight as early as Q3 2021. If issues arise, that target could easily slip to Q4 or into 2022, but SpaceX’s test tank campaigns have historically been very successful.
News
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.
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:
Today’s Tesla Robotaxi App downloads outpaced Uber across all rolling 30 day periods by 40% and bested Waymo’s best download day ever by >6x pic.twitter.com/s9s1XTsUu2
— Brett Winton (@wintonARK) September 5, 2025
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.
News
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.
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.
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.
Investor's Corner
Elon Musk’s new pay plan ties trillionaire status to Tesla’s $8.5 trillion valuation
Shareholders are expected to vote on the proposal at the annual meeting on November 6.
Tesla’s board has proposed a new compensation package for CEO Elon Musk that could make him the world’s first trillionaire and Tesla the most valuable company in history.
The 2025 CEO Performance Award, outlined in a securities filing on Friday, would be worth up to $900 billion in Tesla stock (NASDAQ:TSLA) if the automaker achieves a series of aggressive performance and valuation goals, according to the New York Times.
Shareholders are expected to vote on the proposal at the annual meeting on November 6.
Tesla is aiming for an insane $8.5 trillion market cap
The package requires Musk to lift Tesla’s market capitalization from about $1.1 trillion today to $8.5 trillion over the next decade. At that level, Tesla would surpass every major public company in existence. Nvidia, currently the world’s most valuable firm, has a market cap of around $4.2 trillion today, as noted in a Motley Fool report. Microsoft and Apple follow at $3.8 and 3.6 trillion each, while Saudi Aramco is valued at around $1.5 trillion.
If Tesla achieves its $8.5 trillion target, it would be worth more than twice Nvidia’s present valuation and nearly eight times its current size. The compensation plan also requires Tesla’s operating profit to grow from $17 billion last year to $400 billion annually.
Elon Musk’s path to a trillionaire status
Apart from leading Tesla to become the world’s biggest company in history, Musk is also required to hit several product targets for the electric vehicle maker. These include the delivery of 20 million Tesla vehicles cumulatively, 10 million active FSD subscriptions, 1 million Tesla bots delivered, and 1 million Robotaxis in operation.
Tesla board chair Robyn Denholm and director Kathleen Wilson-Thompson said retaining Musk is “fundamental to Tesla achieving these goals and becoming the most valuable company in history.” If successful, the plan would raise Musk’s Tesla stake from 13% to about 25%, further consolidating his control. It would also result in the CEO earning $900 billion in TSLA stock, allowing him to effectvely become a trillionaire.
The proposal mirrors a 2018 compensation plan that was invalidated in Delaware court earlier this year in the way that it is focused on very aggressive targets and operational milestones. Tesla has since shifted its corporate registration to Texas, where challenges from potential activist shareholders are less of a risk.
Tesla’s SEC filing can be viewed below.
www-sec-gov-Archives-edgar-data-1318605-000110465925087598-tm252289-4_pre14a-htm… by Simon Alvarez
Tesla Robotaxi app download rate demolishes Uber, Waymo all-time highs
Elon Musk’s xAI expands to Seattle with salaries up to $440,000
Elon Musk’s new pay plan ties trillionaire status to Tesla’s $8.5 trillion valuation
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