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SpaceX begins stress-testing upgraded Super Heavy booster

Super Heavy Booster 7 appears to have made it through its first day of structural testing. (NASASpaceflight)

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3 years ago

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In a what is likely a prelude to engine installation, SpaceX has begun stress-testing an upgraded Super Heavy booster prototype.

Known as Super Heavy Booster 7 or B7, the prototype is the first of its kind designed to support up to 33 new Raptor V2 engines – each potentially capable of producing up to 230 tons (~510,000 lbf) of thrust at liftoff. Even with just 20 such engines installed, Super Heavy – measuring around 69 meters (~225 ft) tall and nine meters (~30 ft) wide – will be the largest and most powerful rocket stage ever tested. That potentially unprecedented power is why SpaceX has custom-built a complex structural test stand to explore Super Heavy’s true performance envelope in a slightly less risky manner.

In the second half of 2021, that structural test stand briefly tested an unusual half-Starship, half-Super Heavy test tank with a nine-engine thrust section (‘puck’) and later compressed a different test tank until its reinforced steel skin buckled. In the interim, SpaceX removed its nine-ram setup and modified the stand to support 13 rams, guaranteeing that its new purpose was to test Super Heavy’s new 13-engine thrust section. Prior to Booster 7, all Super Heavy prototypes have had a similar nine-engine puck and an outer ring of 20 engines that would attach directly to the rim of each booster’s cylindrical body.

SpaceX tests Starship and Frankenstein ‘test tank’ simultaneously

Increasing the central engine count from 9 to 13 was already certain to up the amount of stress future Super Heavy thrust pucks would need to survive by almost 45%. But combined with Raptor V2’s thrust increases, Super Heavy Booster 7’s thrust puck could actually be subjected to at least 80% more thrust at liftoff. Altogether, Super Heavy B7’s 33 engines should be able to produce ~7600 tons (~16.8M lbf) of thrust compared to Super Heavy B4’s ~5400 tons (~11.9M lbf). As a result, though it’s odd that SpaceX never did significantly test Booster 4, it’s no surprise that the company chose to give Booster 7 priority as soon it was ready.

After a few false starts and at least one ‘pneumatic proof test’ that likely saw Booster 7 pressurized with benign nitrogen gas, SpaceX began stress-testing the upgraded Super Heavy in earnest on April 14th. First, the booster was filled about a third of the way with roughly 1000 tons (~2.2M lb) of liquid nitrogen (LN2) or a combination of liquid oxygen (LOx) and LN2. Once the rocket was fully chilled, there were clear signs of some kind of added stress as large sheets of ice that had formed on the side of B7’s skin broke apart and fell off.

Only ice close to Super Heavy’s base was visibly disturbed, increasing the odds that the behavior was a sign of some or all of the structural test stand’s hydraulic rams simulating Raptor engines. It’s also possible that the stress was caused by pressurizing Super Heavy’s tanks to the point that they began to appreciably deform, though that type of testing is far harder to differentiate. Without official comments, it’s unfortunately impossible to ever know what exactly SpaceX is testing or how successful those tests are when the structural test stand is involved.

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Nonetheless, it’s likely that Booster 7 isn’t done with the stand just yet. SpaceX could benefit from just about any data gathered about the performance of Super Heavy’s new thrust puck during simulated Raptor startup, throttling, and shutdown both at liftoff and during boostback and landing burns. SpaceX might also want to simulate engine-out scenarios that would result in asymmetric thrust.

Assuming Booster 7 survives this particular series of tests and SpaceX is happy with its performance on the structural test stand, the upgraded Super Heavy could be ready for Raptor installation and integrated wet dress rehearsal and static fire testing in the near future. SpaceX began delivering upgraded Raptors V2 engines to Starbase in late March.

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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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Elon Musk

Tesla engineer explains why Elon Musk deserves new pay package

“When Elon is motivated, it also motivates us, especially in this fork of humanity. I would not be staying in Tesla this long unless he is still leading.”

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3 hours ago

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August 5, 2025

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Elon Musk giving YouTube tech reviewer Marques Brownlee a tour of the Fremont factory. (Credit: MKBHD/YouTube)

A Tesla engineer took to X to explain why he believes Elon Musk deserved the new 96 million share, $29 billion pay package that the company awarded to him yesterday.

Yun-Ta Tsai, a Senior Staff Engineer in the Autopilot program at Tesla, has worked at the company for five years. He has been in his current position for two years and three months.

Tesla rewards CEO Elon Musk with massive, restricted stock package

Tsai posted a lengthy statement in response to Tesla announcing its new pay package for Musk, which the company’s Board of Directors announced yesterday. He was fully in support of his boss getting paid, especially considering Musk “came to work every day” without being paid for eight years.

Tsai said:

“8 years without pay, but Elon still came to work everyday despite hitting all the milestones.

Most founders, even being paid much better, would simply abandon ships or being “zucked”.

I often joked my annual comp was higher than Elon but it was true.

When Elon is motivated, it also motivates us, especially in this fork of humanity. I would not be staying in Tesla this long unless he is still leading.

Hopefully Elon gets his first paycheck soon after 8 years of grinding in hell. It is time.”
It’s no secret that Musk has the reputation of someone who is incredibly driven, motivated, and determined to come through on his personal and professional goals. In times of need at the company, Musk sleeps at the office and works seven days a week.

Recently, it came to the surface that he nearly missed his brother’s wedding years ago because of work.

Musk’s attitude toward work is what has made Tesla, SpaceX, Neuralink, and other entities so successful.

Musk’s new pay package

Tesla announced the new pay package for Musk yesterday, under the following terms:

  • 96 million restricted shares of stock, subject to Elon paying a purchase price upon meeting a two-year vesting term, to be delivered after receipt of antitrust regulatory approval
  • The purchase price will be equal to the split-adjusted exercise price of the stock options awarded to Elon under the 2018 CEO Performance Award ($23.34 per share)
  • A requirement that Elon serve continuously in a senior leadership role at Tesla during the two-year vesting term
  • A pledging allowance to cover tax payments or the purchase price
  • A mandatory holding period of five years from the grant date, except to cover tax payments or the purchase price (with any sales for such purposes to be conducted through an orderly disposition in coordination with Tesla); and
  • If the Delaware courts fully reinstate the 2018 CEO Performance Award, this interim award will be forfeited or returned or a portion of the 2018 CEO Performance Award will be forfeited. To put it simply, there cannot be any “double dip.” Elon will not be able to keep this new award in addition to the options he will be awarded under the 2018 CEO Performance Award, should the courts rule in our favor

The board added a statement that said it believed now would be an ideal time “to take decisive action to recognize the extraordinary value that Elon created for Tesla shareholders.”

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Tesla Cybertruck leftovers are the main course at the Supercharger Diner

Tesla is using recycled steel from Cybertruck manufacturing for the Supercharger Diner in Los Angeles.

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4 hours ago

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August 5, 2025

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Credit: Tesla

Tesla Cybertruck panels that are leftover from manufacturing became the main course at the Supercharger Diner, contributing to the futuristic restaurant’s unique exterior design.

The Supercharger Diner was an idea of Tesla CEO Elon Musk’s in 2018, and in July 2025, it officially opened for business, serving a variety of interesting dishes in a futuristic setting that pays homage to the 1950s restaurant experience.

The design of the Diner is what truly sets it apart: it is reminiscent of the stainless exterior that Tesla used for the Cybertruck. It turns out that’s exactly what it is.

tesla diner supercharger in los angeles california at night

Credit: Tesla

Tesla Chief Designer Franz von Holzhausen revealed in an interview with Tesla Owners Club Austria that the company used recycled panels from Cybertruck manufacturing as siding on the epic diner.

Here’s what he said:

Tesla sourced its stainless steel for the exoskeleton of the Cybertruck from Steel Dynamics Inc. and its plant in Sinton, Texas. The company confirmed this through various outlets, including exhibit descriptions at the Petersen Automotive Museum. The steel is refined through a third party before it is used.

Credit: Cybertruck Owners Club

It also uses the same steel for SpaceX Starship.

It’s pretty interesting that Tesla chose to use the stainless steel for the exterior of the diner in Los Angeles, but it also makes sense considering how durable it has proven to be.

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Elon Musk

Tesla ‘activist shareholders’ sue company and Elon Musk for Robotaxi rollout

Tesla’s activist shareholders are coming after the company, claiming it misled investors about the Robotaxi rollout.

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6 hours ago

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August 5, 2025

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Credit: Joe Tegtmeyer | X

Tesla’s “activist shareholders” seem to be one of the biggest threats to the company and its CEO, Elon Musk, who has spoken extensively about them in recent times. They’re up to their latest bit of work against the company, suing both Tesla and Musk, accusing them of securities fraud by alleging they concealed “significant risk” over the Robotaxi launch in Austin, Texas.

On Monday night, a group of shareholders sued Tesla and Musk in a proposed class action lawsuit in Texas federal court. They claim Tesla misled investors about the safety of the vehicles used in the Robotaxi rollout in Austin, which started on June 22.

The suit indicates that videos show the vehicles “speeding, exhibiting sudden braking, driving over a curb, entering the wrong lane, and dropping passengers off in the middle of multilane roads.” Reuters first reported on the lawsuit.

The plaintiffs are seeking damages for shareholders between April 19, 2023, and June 22, 2025.

Tesla’s Robotaxi platform has been operating for less than two months, and the company has already expanded its geofence in Austin twice.

In the roughly six weeks that Robotaxi has been operational, Tesla has only had one incident reported to the Austin Government, and it was a “Safety Concern” in June 2025. Since July 2023, which is when autonomous vehicle operation began in Austin, 130 incidents have been reported. AV Ride, Cruise, Waymo, and Zoox also operate in Austin.

Waymo has the most incidents with 73. Its first was in June 2024 when a unit blocked traffic.

Activist Shareholders

Musk has warned that activist shareholders are potentially dangerous to both Tesla and his position as CEO. He recently spoke about them during the Q2 Earnings Call regarding his stake in the company:

“That is a major concern for me, as I’ve mentioned in the past. I hope that is addressed at the upcoming shareholders meeting. But, yeah, it is a big deal. I want to find that I’ve got so little control that I can easily be ousted by activist shareholders after having built this army of humanoid robots. I think my control over Tesla, Inc. should be enough to ensure that it goes in a good direction, but not so much control that I can’t be thrown out if I go crazy.”

Tesla’s Board yesterday made an attempt to help secure Musk’s stake by offering him a massive 96 million share pay package of restricted stock. It will only help his stake in the company bump up slightly to 14.6 percent from 12.9 percent.

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