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SpaceX first Super Heavy ‘test tank’ is almost ready for prime time

The latest in a long line of Starship 'test tanks' is almost ready to head to the launch pad. (NASASpaceflight - bocachicagal)

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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.

A massive Super Heavy ‘thrust puck’ sporting a new design was first spotted in Boca Chica on May 29th. (NASASpaceflight – bocachicagal)

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).

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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.

Vents on top of the forward dome are a telltale sign of a test tank. (NASASpaceflight – Nomadd)
SpaceX has modified an existing structural test stand to support BN2.1’s test campaign. (NASASpaceflight – bocachicagal)

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.

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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LIVE BLOG: Tesla (TSLA) Q2 2025 earnings call updates

The following are live updates from Tesla’s Q2 2025 earnings call.

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Credit: Tesla

Tesla’s (NASDAQ:TSLA) earnings call comes on the heels of the company’s Q2 2025 update letter, which was released after the closing bell on July 23, 2025.

Tesla’s Q1 2025 Results: 

Total Revenues: $22.5 billion

Total automotive revenues: $16.7 billion

Total GAAP gross margin: 17.2%

Gross Profit: $3.88 billion

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EPS non-GAAP: $0.40 per share

The following are live updates from Tesla’s Q2 2025 earnings call. I will be updating this article in real time, so please keep refreshing the page to view the latest updates on this story.

16:22 CT – Good day to everyone, and welcome to another Tesla earnings call live blog. Tesla had a pretty big quarter, and while the company’s vehicle deliveries are still down year-over-year, the Robotaxi pilot has been launched in Austin.

Now to see if this earnings call starts on time. Interestingly enough, the EV maker has not posted a link to its Q2 2025 earnings call livestream on its official @Tesla X account yet.

16:26 CT – The earnings call’s livestream on YouTube, however, is up:

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16:28 CT – I wonder which Elon we will get on today’s earnings call? Will be get super locked-in Elon, serious Elon, or lighthearted Elon? Whichever Elon we get, TSLA stock will probably show some reaction in after-hours trading.

16:30 CT – Travis Axelrod of Tesla’s Investor Relations team opens the call. He states that Tesla CEO Elon Musk and other executives are present. And, here’s Elon’s opening remarks.

16:33 CT – Elon opens with the launch of Tesla’s Robotaxi service in Austin, which has gotten “bigger and longer” over the past few weeks. He stated that the service area for Robotaxi services in Austin will get even bigger and longer soon. He mentions the Robotaxi service’s expansion to the Bay Area, Arizona, and Florida in the coming months.

“I think we’ll have Robotaxi in half the population of the US by the end of the year?” Musk said, highlighting that this is subject to regulatory approval. He added that Tesla is expanding its Robotaxi service cautiously.

16:35 CT – Elon noted that the Model Y became the best-selling car in several countries in n Türkiye, Netherlands, Switzerland and Austria in June. This was despite the Model Y selling in these countries without its killer feature–FSD. Despite the regulatory challenges, Elon noted that Tesla will get these approvals, and he is hoping that some areas in Europe should experience FSD in the coming months. “It really is the single biggest demand driver,” Musk said.

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16:37 CT – Elon also mentioned the launch of the Tesla Diner. “This is a very special diner,” Musk said, stating that the facility is a “shining beacon of hope.” He joked that it is rare that a diner makes the news, but the newly launched restaurant is quite something.

On the other hand, Elon noted that Tesla is making significant improvements to its FSD software, and that the company could probably 10X the parameter count from what users are currently experiencing.

16:43 CT – The CEO also highlghted the growth of Tesla Energy, which he noted was a “really big deal.” As for Optimus, Musk stated that the humanoid robot is in its current second generation. Its third generation will be “exquisite,” the CEO noted.

“Tesla is by far the best in the world in real-world AI,” Musk said. He threw some shade at Waymo as well, stating that while Google is good at AI, the tech giant is not as good in real-world AI applications. All those years producing and designing cars matter.

“Tesla has the highest intelligence density in AI so far,” Musk said. “Intelligence density will be a very big deal in the future.”

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16:46 CT – Musk stated that Tesla will probably see prototypes of Optimus Version 3 this year, and scale production next year. Tesla will be ramping these initiatives as fast as possible, considering the company’s aspirations to produce millions of Optimus robots per year. Musk believes that a rate of 1 million Optimus robots per year is feasible within five years.

“We’re not always on time, but we get it done,” Musk said, referencing the company’s tendency to make the impossible feel late. He also reiterated the idea that Tesla can be the omst valuable company in the world if it executes very well.

16:50 CT – Tesla CFO Vaibhav Taneja mentioned the company’s milestone of delivering a car autonomously to a customer for the first time in Q2. He also mentioned the effects of the Trump administration’s regulatory changes for electric vehicles.

He mentioned that Tesla is seeing more test drives, and the company did start the production of more affordable cars in the first half of the year, with volume production planned for the second half of the year.

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Investor's Corner

Tesla (TSLA) Q2 2025 earnings results

Tesla posted total revenues of $22.496 billion and non-GAAP EPS of $0.40 per share.

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Credit: Tesla

Tesla (NASDAQ:TSLA) has released its Q2 2025 earnings results in an update letter. The document was posted on the electric vehicle maker’s official Investor Relations website after markets closed today, July 23, 2025. 

Tesla’s Q2 earnings come on the heels of a quarter where the company produced over 410,000 vehicles, delivered over 384,000 vehicles, and deployed 9.6 GWh of energy storage products. The second quarter also saw the launch of the Roboaxi service’s pilot program in Austin, a notable step forward for the company’s self-driving program.

Tesla’s Q2 2025 earnings in a nutshell


As could be seen in Tesla’s Q2 2025 update letter, the company posted GAAP EPS of $0.33 and non-GAAP EPS of $0.40 per share. Tesla also posted total revenues of $22.496 billion.

In comparison, Wall Street expected Tesla to post earnings per share of $0.39, down 25% from a year ago. Tesla’s revenue is forecasted to fall 13% to $22.19 billion, and analysts also expect the electric vehicle maker to post lower margins this quarter.

Tesla’s other Q2 metrics

For the second quarter, Tesla’s total revenue decreased 12% YoY to $22.5B. Operating income also decreased 42% YoY to $0.9B, resulting in a 4.1% operating margin. Tesla still has a strong war chest, as the company’s quarter-end cash, cash equivalents and investments was $36.8B.

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Product Plans

Tesla noted in its Q2 2025 update letter that the company remains focused on “prudently growing our vehicle volumes in a capex efficient manner by using our existing vehicle production capacity before building new lines.” Still, Tesla noted that plans for new vehicles that will launch in 2025 remain on track, including initial production of a more affordable model in 1H25.

Tesla also reiterated that the Cybercab will be produced using the company’s upcoming “Unboxed” manufacturing process. Volume production of the Cybercab is expected to start sometime in 2026.

Below is Tesla’s Q2 2025 update letter:

TSLA-Q2-2025-Update by Simon Alvarez on Scribd

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Elon Musk reveals big plans for Tesla Optimus at the Supercharger Diner

Will Optimus deliver my Tesla Club on roller skates? I’m hopeful.

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Credit: Elon Musk | X

Elon Musk revealed on X on Wednesday that Tesla Optimus will soon be getting a job at the Supercharger Diner in Los Angeles, and its role will be right on par with what we believed the humanoid bot would be perfect for.

While Optimus was spotted serving popcorn at the Diner on Monday as it opened for the first time, that’s its only job, at least for now. Musk said Optimus will be getting a promotion in 2026, and it will be a food runner, bringing your order straight to your car, eliminating the need to go inside yourself.

It will complete what Tesla hopes is a full-fledged 50s diner experience, curated by the imagination of the future. In the 1950s, drive-in diners were a common hangout to grab a bite and watch a movie. Tesla opened its Supercharger Diner in Los Angeles earlier this week, but it has a futuristic twist to it.

You can order food directly from your car, sync your center touchscreen and speakers to the two massive projection screens that Tesla is playing movie scenes on at the Diner, and even go inside for a true break from your car.

Next year, Tesla will take it a step further, Musk confirmed:

The Diner features 80 Superchargers that can be used by both Tesla and non-Tesla EVs, provided that the manufacturer of the electric car has access to the company’s robust network. It is also available to non-EV owners, as they can park their cars and stop in for a quick bite to eat.

Tesla’s full menu at the Diner is available here, and its focus for the restaurant was to provide healthier options by sourcing most of its food from local, organic, and humane farms:

Optimus’s capabilities seem to be progressing to a point where Tesla feels confident that the humanoid robot can handle carrying food and delivering it to customers at their cars. Whether it will be put on roller skates is another question, but we’re hopeful Optimus can do it when it gets its promotion next year.

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