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SpaceX CEO Elon Musk hints that Starship’s ‘sweating’ metal heat shield is no more

Starship glows from heating as it reenters Earth's atmosphere in this official render. According to Elon Musk, SpaceX is moving away from a steel-only heat shield. (SpaceX)

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In the latest entry of SpaceX’s ever-changing Starship design process, CEO Elon Musk has indicated that the nominally reusable orbital spacecraft has moved away from a liquid-cooled steel heat shield to something slightly more traditional.

This information came as a SpaceX engineer announced during Cargo Dragon’s CRS-18 webcast that the twice-flown spacecraft would mark the first orbital test of a ceramic heat shield tile meant for use on Starship’s windward side. This major design change comes as a significant surprise and seems likely to either delay Starship’s orbital debut or hinder its ultimate reusability, although Musk just as recently claimed that the spacecraft could reach orbit for the first time less than six months from now.

Back in late-2018 and early-2019, Musk took to Twitter to announce that SpaceX was pursuing an exotic metallic heat shield that would be cooled in large part by flowing liquid methane through tiny holes on its exterior, effectively ‘sweating’ away energy and preventing steel tiles from melting.

Despite incontrovertible evidence that SpaceX performed some amount of significant testing on the hexagonally-tiled steel heat shield concept, Musk’s July 24th tweets indicate that the liquid-cooled heat shield is unlikely to ever be used on Starship. For unknown reasons, SpaceX is instead pursuing some sort of thin ceramic heat shielding to protect the entirety of Starship’s windward side (i.e. the side facing the atmosphere during reentry). A handful of the first flight-qualified ceramic tiles – shaped for Dragon instead of Starship – will be tested on Cargo Dragon during the spacecraft’s orbital mission and eventual reentry.

Of note, this is not the only major design change Starship has undergone in just the last few months. Speaking on May 30th, Elon Musk stated that the design of Starship’s landing legs/fins and actuating wings and flaps has changed significantly since SpaceX revealed the new tripod fins + canard wings configuration in September 2018. According to Musk, that change will (or at least should) not significantly impact Starship’s schedule.

Starship has been shown with actuating fins and canard wings since SpaceX’s September 2018 update. (SpaceX)

In fact, per his July 2019 claims that the first full-fidelity Starship prototype(s) could begin test flights in September/October and reach orbit as early as December/January, the Starship/Super Heavy schedule has actually radically sped up in the first half of 2019. In December 2018, Musk stated that he believed Starship had a 60% chance of reaching orbit in 2020, let alone late-2019.

For Starship, the massive spacecraft’s heat shield is arguably its single most important component. A failure to ensure that the heat shield is unprecedentedly reusable and reliable – even in the face of ultra-high-velocity interplanetary reentries – will severely limit Starship’s ability to achieve its ultimate goals of enabling affordable access to space and building a sustainable city on Mars. Musk’s comment that ceramic tiles are just “a possible” Starship heat shield element further indicates that SpaceX has yet to firmly settle on a heat shield design, let alone qualify said shield for orbital flight or kick off the mass-production necessary to completely cover multiple Starship halves.

Simply put, nothing like this will happen until SpaceX can firmly settle on, develop, and field an ultra-high-performance heat shield for Starship. (SpaceX)

Admittedly, there is still some good news in this unfortunate development. Most notably, the fact that Starship will still be made of steel means that the non-metallic heat shield tiles can be extremely thin and light, as they can be more or less directly attached to Starship’s steel hull. Additionally, steel Super Heavy boosters may be able to get away with zero heat shielding thanks to the relatively high melting point and heat resistance of certain varieties of stainless steel.

So long as both of those characteristics remain true, it’s likely that it will still make sense for Starship/Super Heavy to be built entirely out of steel instead of something like aluminum or carbon composite. With any luck, Elon Musk will provide a detailed update on the status of SpaceX’s next-generation launch vehicle soon after Starhopper survives its first untethered flight test.

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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 preps for a harsh potential reality if Musk comp vote doesn’t go to plan

A successful vote for Tesla would see the compensation package get approved. But there is always the possibility of a rejection, which would likely see Musk leave the company.

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tesla cybertruck elon musk
Tesla CEO Elon Musk unveils futuristic Cybertruck in Los Angeles, Nov. 21, 2019 (Photo: Teslarati)

Tesla could be forced to look for a new CEO in the coming months, as a crucial November 6 Shareholder Meeting vote will determine whether Elon Musk will stick around.

A major vote is coming up at the 2025 Tesla Shareholder Meeting, as investors will determine whether Musk should be given a new compensation plan that would award him up to $1 trillion and more than one-fourth of the total voting power within the company.

Tesla board chair reiterates widely unmentioned point of Musk comp plan

A successful vote for Tesla would see the compensation package get approved. But there is always the possibility of a rejection, which would likely see Musk leave the company.

“My fundamental concern with regard to how much voting control I have at Tesla is if I go ahead and build this enormous robot army, can I just be ousted at some point in the future? That’s my biggest concern,” Musk said at last week’s Earnings Call. “That’s what it comes down to in a nutshell. I don’t feel comfortable wielding that robot army if I don’t have at least a strong influence.”

Tesla Board of Directors Head Robyn Denholm has been on somewhat of a PR tour over the past few days, answering questions about the compensation plan, which is among the biggest issues currently for the company.

Denholm told Bloomberg yesterday that Tesla investors need to be prepared for Musk to abandon ship if the package is not approved, which brings on a new question: Who would take over the CEO role?

That is a question Denholm also answered yesterday, bringing forth the conclusion that Tesla would not look for an outside hire if Musk were to leave the company. Instead, it would promote someone internally.

The way it was reported by Bloomberg and Reuters seems to make it seem as if Tesla is preparing for the worst, as it states the company “is looking at internal CEO candidates,” not preparing to do so.

Of the executives at Tesla who immediately come to mind as ideal candidates for a potential takeover should Musk leave, Tesla China President Tom Zhu and Head of AI Ashok Elluswamy both come to mind. Zhu has monumental executive experience already, as he was appointed to the role of Senior VP of Automotive back in December 2022.

He then returned to China in 2024.

It seems Tesla wants to align its future, with or without Musk, on the same path that it is currently on, and internal candidates might have a better idea of what that looks like and truly means.

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Tesla Full Self Driving (FSD) is nearing approval in a new country

As per the official, Tesla’s Full Self-Driving system could be enabled in Israel in the near future.

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Credit: @BLKMDL3/X

It appears that Tesla FSD (Supervised) is heading to a new country soon, at least based on comments from Israel’s Transport and Road Safety Minister Miri Regev.

As per the official, Tesla’s Full Self-Driving system could be enabled in Israel in the near future.

Israeli drivers are pushing for FSD rollout

While Tesla’s FSD is already operational in markets like the U.S., Canada, and Australia, Israeli owners have long been unable to use the feature due to regulatory barriers. Despite its premium price tag, however, numerous Tesla owners in Israel have noted that the technology’s safety benefits, at least when approved for real-world use in the country, justify its cost. 

It was then no surprise that nearly 1,000 Tesla owners in Israel have already petitioned the government to greenlight FSD’s domestic release in Israel. In a post on X, Regev seemed to confirm that FSD is indeed coming to Israel. “I’ve received the many referrals from Tesla drivers in Israel! Tesla drivers? Soon you won’t need to hold the steering wheel,” she wrote in her post.

FSD’s regulatory support in Israel

Regev stated that her Ministry views promoting innovative technologies as essential to improving both road safety and smart mobility. A working group led by Moshe Ben-Zaken, Director General of the Ministry of Transportation has reportedly been tasked to finalize the approval process, coordinating with regulatory and safety agencies to ensure compliance with international standards.

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In a comment to Geektime, Israel’s Ministry of Transportation and Road Safety noted that Regev is indeed supporting the release of FSD in the country. “Minister Regev sees great importance in promoting innovative technologies, and in particular in the entry of advanced driving systems (FSD) into the Israeli market, as part of the ministry’s policy to encourage innovation, safety, and smart transportation,” the Ministry stated.

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Investor's Corner

Bank of America raises Tesla PT to $471, citing Robotaxi and Optimus potential

The firm also kept a Neutral rating on the electric vehicle maker, citing strong progress in autonomy and robotics.

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Credit: Tesla

Bank of America has raised its Tesla (NASDAQ:TSLA) price target by 38% to $471, up from $341 per share.

The firm also kept a Neutral rating on the electric vehicle maker, citing strong progress in autonomy and robotics.

Robotaxi and Optimus momentum

Bank of America analyst Federico Merendi noted that the firm’s price target increase reflects Tesla’s growing potential in its Robotaxi and Optimus programs, among other factors. BofA’s updated valuation is based on a sum-of-the-parts (SOTP) model extending through 2040, which shows the Robotaxi platform accounting for 45% of total value. The model also shows Tesla’s humanoid robot Optimus contributing 19%, and Full Self-Driving (FSD) and the Energy segment adding 17% and 6% respectively.

“Overall, we find that TSLA’s core automotive business represents around 12% of the total value while robotaxi is 45%, FSD is 17%, Energy Generation & Storage is around 6% and Optimus is 19%,” the Bank of America analyst noted.

Still a Neutral rating

Despite recognizing long-term potential in AI-driven verticals, Merendi’s team maintained a Neutral rating, suggesting that much of the optimism is already priced into Tesla’s valuation. 

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“Our PO revision is driven by a lower cost of equity capital, better Robotaxi progress, and a higher valuation for Optimus to account for the potential entrance into international markets,” the analyst stated.

Interestingly enough, Tesla’s core automotive business, which contributes the lion’s share of the company’s operations today, represents just 12% of total value in BofA’s model.

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