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SpaceX to upgrade Starship with 50% more Raptor engines

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SpaceX CEO Elon Musk says that future Starships – or at least certain Starship variants – are being upgraded with 50% more Raptor engines and stretched propellant tanks.

On December 17th, the CEO revealed the plans, confirming a tweet published three months prior stating that Starship was “begging for an extra 3 engines.” Musk was likely referring to the fact that a 9-engine Starship – combined with upcoming 33-engine Super Heavy boosters – would create a rocket with 42 engines, a number made famous as “the answer to the ultimate question of life [and everything]” in Hitchhiker’s Guide to the Galaxy – both of which the CEO vocally enjoys. As ever, it’s thus almost impossible to tell jokes from serious, consequential plans – as is the case with Starship.

Nonetheless, origination aside, adding another three Raptor engines to Starship – boosting the count from six to nine – and stretching its tanks could be a substantial upgrade.

According to amateur modelers, who are generally able to estimate rocket performance with enough information about its structures, shape, and engines; an optimal nine-engine Starship’s tanks would be stretched about 25% to store an additional 300 tons (650,000 lb) of cryogenic liquid oxygen and methane (LOx/LCH4). That upgraded Starship would have a liftoff mass close to 1600 tons (3.5M lb) and stand about 55 meters (~180 ft) tall – 10% taller than current ships.

At stage separation, close to vacuum, a stretched Starship with three sea-level-optimized Raptors (RCs) and six vacuum-optimized Raptors (RVacs) should produce at least 2000 tons (4.4M lbf) of thrust – and possibly more than 2250 tons (~5M lbf) depending on engine performance. At that upper level of thrust, Starship – an upper stage – would be just 10% less powerful than the first stage of Falcon Heavy, the most powerful operational rocket in the world.

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Regardless of its thrust, dimensions, or weight, what matters most is how a stretched, nine-engine Starship would impact that overall rocket’s launch performance. If unofficial modelers are to be believed, the results are significant: compared to a ‘normal’ Starship with a six-engine upper stage and 33-engine booster, the stretched ship could theoretically boost the amount of payload the rocket can launch to low Earth orbit (LEO) from about 150 tons to 220 tons or more (330,000 to 485,000+ lb) – an almost 50% improvement. In fact, per another recent comment from Musk indicating that Starship – unlike almost all other rockets – won’t temporarily throttle down on ascent, the total payload performance could be a bit less than 230 tons (~500,000 lb) – more than 50% greater than a shorter six-engine Starship.

If those estimates are accurate, upgrading Starship with nine Raptors and stretching its tanks is a no-brainer. It might slow development and make all nine-engine ships cost a substantial fraction more but a 50% improvement in payload performance would significantly improve the efficiency of Starship’s more ambitious Moon and Mars launch profiles, which require numerous orbital refuelings.

In effect, a 50% payload increase would allow SpaceX to complete most refueling tasks more efficiently, quickly, and cheaply. Even if the upgrade plans mean that all Starships will be stretched and carry nine Raptors, fully refueling the new Starship variant in LEO could require 7 tanker launches instead of 8-10. If SpaceX doesn’t mind maintaining multiple distinct Starship variants, which appears to be the case, then ships that are exclusively dependent on refueling (Moon and Mars landers in particular) could stay at their current size, with ~1200 tons (~2.6M lb) of propellant storage and six Raptors. A fleet of upgraded Starships could thus refuel their smaller siblings with just 5-6 tanker launches.

However, there’s a good chance that the extra mass required to stretch Starship ~5.5m (~4 tons or ~9000 lb) is minor enough that SpaceX will instead stretch all Starship variants. In fact, for variants like NASA’s HLS Moon lander and future Marsbound Starships, which depend entirely on refueling to reach their destinations, stretched tanks and more propellant storage could increase the amount of payload they could send to the Moon, Mars, and other high-energy destinations by quite a bit. Ultimately, it will be fascinating to hear more details from SpaceX and Musk on how exactly the upgraded Starship design might benefit those operations in the coming weeks and months.

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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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Analyst: Elon Musk’s $1 trillion Tesla pay deal modest against robot market potential

Jonas highlighted Tesla’s longer-term ambitions in robotics as a key factor in his assessment.

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Credit: Tesla

Morgan Stanley analyst Adam Jonas, one of Wall Street’s most ardent Tesla (NASDAQ:TSLA) bulls today, has described Elon Musk’s newly proposed $1 trillion performance-based compensation package as a “good deal” for investors. 

In a note shared this week, Jonas argued that the package helps align the interests of Musk and Tesla’s minority shareholders, despite its shockingly high headline number.

Future market opportunities

Jonas highlighted Tesla’s longer-term ambitions in robotics as a key factor in his assessment. “Yes, a trillion bucks is a big number, but (it) is rather modest compared to the size of the market opportunity,” Jonas wrote. He added that the humanoid robot market could ultimately surpass the size of today’s global labor market “by a significant multiple.”

“We have entertained scenarios where the humanoid robot market can exceed the size of today’s global labor market… by a significant multiple,” Jonas wrote, as shared on X by Tesla watcher Sawyer Merritt.

The analyst likened the arrival of AI-powered robotics to the transformative effect of electricity, noting that “contemplating future global GDP before AI robots is like contemplating global GDP before electricity.” The Morgan Stanley analyst’s insights align with the idea that as much as 80% of Tesla’s future valuation could be tied to its Optimus humanoid robot program.

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Elon Musk’s pay package

Tesla’s board has tied Elon Musk’s proposed compensation package to some of the most ambitious targets in corporate history. The 2025 CEO Performance Award requires the automaker’s valuation to soar from roughly $1.1 trillion today to $8.5 trillion over the next decade, a level that would make Tesla the most valuable company in existence.

The plan also demands a leap in Tesla’s operating profit, from $17 billion in 2024 to $400 billion annually. It also ties the CEO’s compensation to a number of product milestones, including the delivery of 20 million vehicles in total, 10 million active Full Self-Driving subscriptions, 1 million Tesla Bots, and 1 million Robotaxis in operation. Tesla’s board emphasized that Musk’s leadership was fundamental to achieving such ambitious goals, with Chair Robyn Denholm noting the award would align the CEO’s incentives with long-term shareholder value.

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Tesla China posts strongest registrations of Q3 so far with first Model Y L deliveries

Tesla posted 14,300 insurance registrations in China during the week of September 1–7.

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Credit: Tesla China

Tesla posted 14,300 insurance registrations in China during the week of September 1–7, a 14.4% increase from the previous week’s 12,500 units. 

The figure marks Tesla’s highest weekly performance so far this quarter so far, despite the company’s year-over-year figures still being below 2024’s numbers.

Weekly registrations

The week’s registrations broke down to 5,000 Model 3s and 8,400 Model Ys, including the first 900 units of the newly launched Model Y L variant, as per estimates from industry watchers. On a quarterly basis, Tesla China is tracking 41.3% growth compared to the previous quarter, which bodes well for the company’s results this Q3 2025.

For the month of August, Tesla sold 57,152 vehicles in China, down 9.93% from the same period in 2024 but up 40.7% from July’s 40,617 units, according to the China Passenger Car Association (CPCA). Year-to-date, Tesla’s China sales are 7.2% lower compared to the previous year.

Model Y L first deliveries

The week ending September 7 was the first week that included the newly released Model Y L, a six-seat extended wheelbase version of the company’s best-selling all-electric crossover. Industry watchers estimate that last week, the first 900 units of the Model Y L have been registered, though this number is expected to increase in the coming weeks as deliveries of the vehicle hit their pace.

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Citing information from a Tesla store in Beijing, Chinese media outlet Cailianshe stated that the Model Y L has been seeing a lot of interest among car buyers. “(The Model Y L) is selling very well. Since its launch, 120,000 orders have been received, with nearly 10,000 orders placed every day. The first batch of customers began receiving deliveries in the past two days,” a Tesla representative stated.

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Tesla launches MultiPass to simplify charging at non-Tesla stations

With the new service, Tesla owners can activate charging either through the Tesla app or by using their existing Tesla key card.

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tesla nacs charger
(Credit: Tesla)

Tesla has introduced MultiPass, a new feature that allows owners to use their Tesla account to charge at non-Tesla charging stations. 

The service launched this week in the Netherlands, giving drivers the ability to find chargers, start sessions, and view charging history directly within the Tesla app.

Streamlining third-party charging

With MultiPass, Tesla owners can activate charging either through the Tesla app or by using their existing Tesla key card. This eliminates the need for separate accounts or additional cards from third-party networks. Tesla Charging highlighted the convenience of managing charging sessions in one location in a post on X, while Max de Zegher, Tesla’s Director of Charging for North America, emphasized that the update removes unnecessary friction.

“Nobody likes creating more accounts with payment details and passwords. For charging, this can even mean needing a third-party charging card mailed to your house. Starting in the Netherlands today, your Tesla App and your existing (!) Tesla keycard can start charging at third-party chargers. We’ll expand this to more countries quickly if customers love it. To make ownership effortless, the Tesla App should really be the only thing you need,” the Tesla executive wrote in a post on X.

Third-party payments and a familiar name

Tesla owners could pay for their third-party charging session with their Tesla accounts, as per the electric vehicle maker on its official website. Payments are drafted from users’ default payment method in the Tesla App, though charging costs will still vary depending on the third-party charger that is used.

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Interestingly, the MultiPass name also echoes a pop culture reference. In the 1997 sci-fi film The Fifth Element, Leeloo Dallas-505 carried a futuristic “Multipass” smart card that functioned as her ID, passport, and ticket to space travel. Her accented repetition of “Multipass!” became one of the film’s most memorable lines, and it highlighted the card’s all-in-one convenience.

Tesla has not provided a timeline for Multipass’ U.S. rollout, though the service could become an important addition to the growing but often fragmented landscape of DC fast charging.

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