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SpaceX Super Heavy booster returns to launch pad after major repairs
SpaceX has returned its newest Super Heavy to Starbase’s orbital launch site (OLS) after rapidly repairing damage the booster suffered during its first round of testing.
Super Heavy Booster 7 (B7) left the High Bay it was assembled in for the first time on March 31st and rolled a few miles down the road to nearby Starship launch and test facilities on a set of self-propelled mobile transporters (SPMTs). On April 2nd, the roughly 67-meter-tall (~220 ft; 69m w/ Raptors) rocket was installed on top of Starbase’s lone orbital launch mount (OLM), setting the stage for crucial qualification testing.
The start of that process was exceptionally successful. On April 4th, after a smooth launch mount installation, SpaceX quickly filled Booster 7’s propellant tanks with a relatively benign cryogenic fluid (liquid nitrogen, liquid oxygen, or both) to simulate the thermal and mechanical characteristics of real flammable propellant. Despite the fact that the test marked the first time SpaceX had fully filled a Super Heavy prototype’s tanks, Booster 7 sailed through the ‘cryoproof’ without any obvious issue.
On April 8th, SpaceX moved Super Heavy B7 from the orbital launch mount to a structural test stand that had been installed and modified just a few hundred feet away in the weeks prior. This is where Booster 7’s near-perfect start to qualification testing took a bit of a turn. Booster 7 is only the third full-size Super Heavy prototype SpaceX has tested since July 2021. Like Booster 3 and Booster 4 before it, Booster 7 features some major design changes that ultimately make the prototype a pathfinder, necessitating extensive qualification testing.
To name just a few of the changes, Super Heavy B7 is the first booster fitted with a 33-engine puck and the first finished Starship prototype of any kind designed to use new Raptor V2 engines. With all 33 engines installed and operating a full thrust, Booster 7’s entire structure – and its aft thrust section especially – would be subjected to around 40% more thrust and stress than Booster 4, which indirectly completed structural testing with the help of a sacrificial test tank. Beyond differences in thrust and mechanical stress, Booster 7 is also the first Super Heavy to reach the test stand with secondary ‘header’ tanks meant to store landing propellant.
It’s unclear if those header tanks were fully filled and drained during Booster 7’s cryoproof, but they would not be quite as cooperative during a different kind of cryogenic testing on the structural test stand. The stand SpaceX modified specifically for Super Heavy B7 was outfitted with 13 hydraulic rams to simulate the full thrust of the booster’s central Raptor V2 engines – up to almost 3000 tons (~6.6M lbf) compared to Booster 4’s ~1700 tons (~3.7M lbf) with a smaller cluster of nine engines.
Implosion at the Structural Test Stand
After a few false starts and minor tests on the stand, Booster 7 finally managed some significant testing on April 14th. Judging by the rhythmic shattering of ice that built up on Super Heavy’s tanks, the test stand was able to simulate the thrust of Raptors to some degree and subject the booster to major mechanical stress that was felt from tip to tail. Within a few days, Booster 7 was removed from the test stand and returned to the high bay on April 18th. Around April 21st or 22nd, an image was leaked showing extensive damage inside Booster 7, confirming that the Super Heavy’s test campaign had been forced to end prematurely.
Right away, the damage shown in the photo hinted at an operational failure, meaning that mistakes made by the rocket’s operators may have been more to blame than a possible design flaw. The photo shows a short portion of B7’s liquid methane (LCH4) transfer tube that runs through the booster’s new liquid oxygen (LOx) header tank, which itself sits inside Super Heavy’s main LOx tank at the aft end of the rocket – a tube inside a small tank inside a large tank, in other words. Super Heavy’s LCH4 transfer tube generally does what it says, allowing methane to safely fly down through the main LOx tank and fuel up to 33 Raptor engines. At full thrust, that tube would need to supply around 20 tons (~45,000 lb) of methane per second.
However, on top of merely transferring methane through the oxygen tank, Booster 7 introduced a design change that allows some or all of that tube to change functions and become a header tank mid-flight. That would require a system of valves that could seal off the main LCH4 tank once it was emptied, turning the transfer tube into a sort of giant steel straw filled with enough LCH4 to fuel Super Heavy’s boost-back and landing burns.
The damaged transfer tube in the leaked photo of Booster 7 doesn’t look that unlike what one might expect to see if they sucked through one end of a straw while blocking the other end, collapsing the center. Translated to the scale of Super Heavy, after an otherwise successful day of structural testing, SpaceX operators may have accidentally closed or opened the wrong valves while draining the booster’s transfer tube of liquid oxygen or nitrogen. As the heavy liquid drained from the tube, a lack of pressure equalization could have quickly drawn a vacuum and caused the tube to implode.
On April 29th, a SpaceX fan turned analyst published an analysis that convincingly pinpointed the moment Booster 7’s transfer tube collapsed. Simultaneously, because it showed that the transfer tube likely imploded during detanking, the analysis more or less confirmed the above speculation that the failure had been caused by a degree of operator error or poor test design. Of course, it’s possible that a hardware or software design flaw contributed to or caused the anomaly or that something like a pressure differential in the LOx header tank and LCH4 header tube could also explain the damage, but the accidental formation of a vacuum during detanking is arguably the simplest (obvious) explanation.
After the image of the internal damage leaked, the immediate consensus among fans and close followers was that Booster 7 was beyond repair. Instead, SpaceX appears to have proven those assumptions wrong and somehow managed to repair the upgraded Super Heavy to the point that it was worth testing again less than three weeks after returning to the high bay. On May 6th, B7 was rolled back to the launch site and installed, for the second time, on the orbital launch mount.
Prior to the failure, the general expectation was that SpaceX would begin installing Raptor V2 engines as soon as Booster 7 passed structural testing. It remains to be seen if SpaceX wants to repeat Booster 7’s cryoproof or structural testing to ensure that its quick repairs did the job before proceeding into static fire testing as previously planned. Nonetheless, hope lives on for the Super Heavy prototype and new test windows have been scheduled from 10am to 10pm on May 9th, 10th, and 11th.
Elon Musk
Teslas will self-deliver to customers, Elon Musk says: here’s when
Teslas will soon drive themselves to customers, Elon Musk says
Tesla CEO Elon Musk has an extremely busy month for himself and his company in June if all goes according to plan.
Not only is Tesla planning to launch its Robotaxi platform in Austin, Texas, next month, but Musk is also now indicating that Teslas will self-deliver to customers in June as well.
Musk has said for some time that Tesla vehicles would soon be capable of driving to customers without a driver within the car. Initially, it seemed like the company would do this in the areas close to its U.S. factories – the Greater Austin, Texas, area, and potentially in Northern California’s Bay Area of San Francisco, where the company’s Fremont Factory operates.
Upon confirmation that Tesla has been testing driverless Robotaxi rides in Austin for the past several days, Musk brought forth a new detail that fans of the company will love to hear: Teslas will soon drive themselves to customers, eliminating the need for trips to the showroom for delivery.
How soon? Musk says next month:
For the past several days, Tesla has been testing self-driving Model Y cars (no one in driver’s seat) on Austin public streets with no incidents.
A month ahead of schedule.
Next month, first self-delivery from factory to customer.
— Elon Musk (@elonmusk) May 29, 2025
There is no doubt that the bigger news within Musk’s X post is that it is on track for the launch of the Robotaxi platform. Tesla has been touting its prowess in self-driving for several years. As other companies have executed, Tesla has taken a more unorthodox approach by utilizing only cameras and being much more reserved with its rollout of driverless software.
While Full Self-Driving is consistently ranked at the top of the current Advanced Driver Assistance Systems (ADAS), it is not fully autonomous. That is set to change, and not only will it yield the results of what will hopefully be a successful Robotaxi fleet, but also a vehicle delivery process that makes buying a vehicle more convenient than it already is from Tesla, with no hassle, no dealership jargon, and no negotiating.
The launch of the Robotaxi platform is set for Austin on June 12, according to Bloomberg, where roughly 10 Model Y SUVs will make their way around the city initially. Tesla will expand as safety is proven, which is the utmost priority.
Musk also said later on X that people should be able to fly to Austin and hail a Robotaxi by the end of June.
Elon Musk
Tesla lands on date for Robotaxi launch in Austin: report
Tesla has reportedly landed on a tentative date to launch the Robotaxi platform in Austin.
Tesla has reportedly landed on a set date for its launch of the Robotaxi platform in Austin, Texas.
Bloomberg is reporting that Tesla has discussed June 12 internally, and there is still the potential for it to change.
The date comes after Tesla tested the driverless ride-sharing platform on public roads in Austin, and has been for several weeks. The report said that Tesla started doing it this week, and CEO Elon Musk confirmed on X by saying:
“For the past several days, Tesla has been testing self-driving Model Y cars (no one in driver’s seat) on Austin public streets with no incidents.”
The report indicates a person was in the vehicle, but not in the driver’s seat. Instead, a Tesla engineer sat in the passenger seat of a Model Y, “which drove autonomously with no remote operation.”
Tesla set for ‘golden age of autonomous’ as Robotaxi nears, ‘dark chapter’ ends: Wedbush
The testing has successfully gone on a month ahead of the company’s deadline of June 30.
Currently, Tesla’s plans for the initial rollout of the suite are extremely limited. There will only be ten vehicles at first, and the riders will be invited by the company. This is an effort that puts safety at the forefront of this trial period, and will expand as time goes on.
It could be sooner than expected, as Musk also said that anyone would likely be able to visit Austin and take a ride in the Robotaxi by the end of June.
For the past several days, Tesla has been testing self-driving Model Y cars (no one in driver’s seat) on Austin public streets with no incidents.
A month ahead of schedule.
Next month, first self-delivery from factory to customer.
— Elon Musk (@elonmusk) May 29, 2025
The report and subsequent announcement come after many media outlets reported Tesla was not testing Robotaxi in any capacity. Some had even considered the project a total failure even before the June launch date, a typical tone most media take with the company.
Tesla Robotaxi deemed a total failure by media — even though it hasn’t been released
Tesla has not been great at meeting its own timelines, but it has been adamant that it would reach this June deadline for several months.
Now that it appears Tesla is at an all-systems-go mentality for the Robotaxi launch, it will be interesting to see how quickly it can expand from its initial testing.
Shares are up just over 1.3 percent as of 10:30 a.m. on the East Coast. They are up 24 percent over the past 30 days, and down just 4.5 percent for the year so far.
The Robotaxi fleet will help to bolster Tesla’s position as a leader in autonomy, something it has already essentially achieved through its successful operation of the Supervised Full Self-Driving suite.
Elon Musk
Tesla investors demand 40-hour workweek from Elon Musk
Pension fund leaders push the Tesla board to require 40 hrs/wk from Elon Musk. Should Tesla enforce this? Or simply trust Musk?
Pension fund leaders with Tesla investments are urging the company’s board to mandate Elon Musk dedicate at least 40 hours per week to the electric vehicle maker, citing a looming crisis.
The group holds a combined 7.9 million TSLA shares and expressed alarm over Tesla’s challenges in a Wednesday letter to board chair Robyn Denholm.
“Tesla’s stock price volatility, declining sales, as well as disconcerting reports regarding the company’s human rights practices, and a plummeting global reputation are cause for serious concern,” the investors wrote.
They attributed many issues to Musk’s external activities, including his role in the U.S. Department of Government Efficiency (DOGE). The pension fund leaders criticized the board for failing to ensure Musk’s “full-time attention” on Tesla. The group includes the SOC Investment Group, the American Federation of Teachers, New York City Comptroller Brad Lander, and Oregon State Treasurer Elizabeth Steiner.
The investors’ letter comes as the Tesla board plans for Elon Musk’s next compensation plan, following the Delaware Court of Chancery’s 2023 ruling to rescind his $56 billion 2018 package. Besides a 40-hour workweek requirement, they also called for a clear succession plan and limits on directors’ external board commitments to strengthen governance. The letter highlighted concerns about board independence. Tesla recently added former Chipotle CFO Jack Hartung, who previously worked with Musk’s brother, Kimbal Musk, as a Tesla board member.
The group’s letter reveals where the position of some investors as Elon Musk forges ahead with Tesla’s future plans. Musk’s broader ambitions for Tesla were evident during the Q4 and FY 2023 earnings call, where he envisioned the company as an AI and robotics powerhouse with “truly immense capability and power.” He emphasized his desire for 25% voting control to maintain influence without complete control.
“You know, we’ve had a lot of challenges with Institutional Shareholder Services, ISS — I call them ISIS — and Glass Lewis, you know, which there’s a lot of activists that basically infiltrate those organizations and have strange ideas about what should be done,” Musk said.
As Musk plans to focus more on Tesla, alongside xAI and SpaceX, the investors’ demands underscore tensions between his expansive vision and shareholder expectations. With Tesla navigating stock volatility and reputational challenges, the board faces pressure to align Musk’s leadership with the company’s long-term stability.
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