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SpaceX CEO Elon Musk teases nine-engine Starship, Raptor upgrades

CEO Elon Musk has some thoughts about the future of Starship, Super Heavy, and their shared Raptor engines. (SpaceX)

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In his latest round of SpaceX-related tweets, CEO Elon Musk says that the company has plans to boost Raptor’s performance by at least 15% and the number of those engines installed on Starship by 50%.

Those updated goals came hand in hand with significant changes to the design and operation of both Starship and its Super Heavy booster, which at one point was expected to utilize a “Boost” variant of Raptor that would trade thrust vector control (TVC; i.e. gimballing) and a wide throttle range for far greater thrust. At least according to Musk’s latest account, that substantially different “Raptor Boost” variant is now no more.

On July 3rd, NASASpaceflight forum member and photographer BocaChicaGal captured photos of SpaceX delivering three new Raptor engines to its Boca Chica Starship factory. Two of those engines (RB3 and RB4) featured Raptor Boost labels and were likely the first engines of their kind to complete qualification testing in McGregor, Texas. As of their arrival in South Texas, it was assumed that Raptor Boost still represented a variant of the engine with almost 50% more thrust at the cost of gimbal and throttle authority.

However, Musk himself replied to some of the resulting tweets later that evening, revealing that Super Heavy’s outer ring of up to 20 “Raptor Boost” engines would indeed have no ability to gimbal but would still be able to throttle.

Later the same day, the SpaceX CEO clarified further, stating that the company now plans to upgrade Raptor’s existing design to boost engine thrust to ~230 tons (~510,000 lbf) while still maintaining a wide throttle range and optional thrust vector control. With such an engine, “all Raptors on [a Super Heavy] booster, whether fixed or gimbaling, would be the same.” The only unique aspect of “Raptor Boost,” then, would be their installation around the inner ‘ring’ of Super Heavy’s skirt and their resulting lack of gimbal authority.

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It’s somewhat unclear, then, why two of the engines SpaceX delivered on July 3rd were labeled “RB#” and one explicitly outfitted with a name tag reading “Hello, my name is Boost.” Notably, a quick side-by-side comparison enabled by those photos strongly implies that Raptor Booster engine 3 (RB3) and Raptor 79 (R79) are virtually identical aside from RB3’s rerouted plumbing and unique mounting hardpoints. In other words, barring surprises, the “boost” nomenclature appears to be more vestigial than anything.

Ultimately, as Musk notes, if SpaceX manages to boost “Raptor 2” to 230 tons of thrust, a Super Heavy booster with 33 mostly identical engines would have a peak liftoff thrust around 7600 tons (~16.8 million lbf), translating to a thrust to weight ratio of more than 1.5. For a large rocket with liquid propulsion only, a TWR greater than 1.5 is very respectable and improves acceleration off the launch pad, reduces gravity losses in the first few minutes of ascent, and thus boosts overall efficiency.

Already, Musk’s implication that 33 engines could ultimately be installed on Super Heavy is a departure from comments the CEO made barely a month ago when he revealed a base increase from 28 to 29 engines with the possibility of expanding to 32 down the road. Also new is the implication that SpaceX is considering adding three more vacuum-optimized engines to Starship’s six planned Raptors, leaving ships with six Raptor Vacuum (RVac) engines and three sea level-optimized engines (the same variant on Super Heavy).

Musk says that SpaceX has yet to decide if Raptor Vacuum will be commonized with Raptor 2, boosting its thrust, or if greater efficiency will be pursued instead. Regardless, even with six 200-ton-thrust RVacs and three Raptor 2s, Starship would produce upwards of 2000 tons of thrust in vacuum, creating an upper stage with almost as much thrust as Falcon Heavy and a fully-fueled thrust to weight ratio of ~1.7 – even better than Super Heavy.

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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SpaceX is preparing to launch Starship V2 one final time

The mission will test reentry dynamics, new landing burn configurations, and heat-shield upgrades.

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Credit: SpaceX/X

SpaceX is preparing to launch its final Starship V2 rocket on October 13, 2025. The launch closes the curtain on Starship V2 and marks the start of the ambitious spacecraft’s V3 era. 

Liftoff for Flight 11 is scheduled for 7:15 p.m. ET from Starbase in South Texas, with a 75-minute launch window. The mission will test reentry dynamics, new landing burn configurations, and heat-shield upgrades ahead of the transition to the next-generation Starship V3.

Starship V3 and beyond

Elon Musk confirmed on X that Starship V3 is already in production and could be “built & tested” and perhaps even flown before the end of 2025. The new version is expected to feature major performance and scale improvements, with Musk stating that Starship V3, provided that things go well, might be capable of reaching Mars, though V4 is more likely to perform a full-scale mission to the red planet. 

“Only one more V2 left to launch,” Musk wrote back in August following Starship’s successful Flight 10 mission. In another post, Musk stated that “Starship V3 is a massive upgrade from the current V2 and should be through production and testing by end of year, with heavy flight activity next year.”

Starship V2’s final mission

Flight 11 is designed to push the limits of Starship V2. SpaceX engineers have intentionally removed heat-shield tiles in vulnerable areas to analyze how the vehicle handles atmospheric reentry under stress, as noted in a Space.com report. The test will also refine subsonic guidance algorithms and new landing burn sequences for the Super Heavy booster that would be used for Starship V3.

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“Super Heavy will ignite 13 engines at the start of the landing burn and then transition to a new configuration with five engines running for the divert phase. Previously done with three engines, the planned baseline for V3 Super Heavy will use five engines during the section of the burn responsible for fine-tuning the booster’s path, adding additional redundancy for spontaneous engine shutdowns. 

“The booster will then transition to its three center engines for the end of the landing burn, entering a full hover while still above the ocean surface, followed by shutdown and dropping into the Gulf of America,” SpaceX wrote in a post on its official website.

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xAI’s new facility will save Memphis 5 billion gallons of water annually

The project was described as a long-needed solution for the region as it will be capable of recycling up to 13 million gallons of greywater daily.

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Credit: xAI Memphis/X

Elon Musk’s artificial intelligence startup, xAI, has officially broken ground on its $80 million wastewater treatment facility in Memphis, Tennessee. The project aims to reduce strain on the Memphis aquifer by 9% and repurpose 20% of wastewater from the nearby Memphis T.E. Maxson wastewater facility that would otherwise flow back into the Mississippi River.

A major step towards sustainability

City officials, including Councilman J. Ford Canale and Memphis Chamber of Commerce CEO and President Ted Townsend, joined xAI staff at the October 10 ceremony. The project was described as a long-needed solution for the region as it will have a treatment capacity of 13 million gallons daily, which would then be used for industrial cooling use xAI and the Tennessee Valley Authority (TVA). 

This means that the facility will help conserve 5 billion gallons of potable water annually, easing demand on Memphis’ primary water system. At these levels, xAI Memphis noted that its wastewater treatment facility will feature the largest ceramic membrane MBR in the world, using 13,000 membrane modules that collectively span over 900,000 square feet, roughly the size of 16 football fields. 

Construction permits have been secured for the pump station, while the main operations permit from the Tennessee Department of Environment and Conservation remains under review.

A privately funded push

The wastewater treatment facility represents a rare privately funded water reclamation initiative, with xAI covering construction costs, as noted in a Yahoo News report. The company filed preliminary plans through its affiliate CTC Property LLC in 2024, hinting at the startup’s long-term commitment to sustainable infrastructure around its growing Memphis operations. TVA CEO and President Don Moul shared his excitement for the project.

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“This is a big day for Memphis, Tennessee. This initiative not only reduces our need to purchase water from MLGW for our nearby Allen Combined Cycle Plant, but it also eases demand on the region’s potable water system. By recycling water for cooling purposes, we’re helping to preserve drinking water for the community and advancing a solution that benefits both the environment and the Greater Memphis area,” he said.

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Japan paves the way for Tesla Full Self-Driving domestic rollout

Tesla’s vehicles are allowed to be retrofitted with a software update that could enable the activation of self-driving features.

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Credit: Tesla AI/X

Japan seems to be taking some serious steps to pave the way for the domestic rollout of Tesla’s Full Self-Driving (FSD) system in the country. 

This was hinted at by a decision from the Ministry of Land, Infrastructure, Transport and Tourism Ministry.

FSD update

As noted in a report from Nikkei, Tesla’s artificial intelligence-powered vehicles are allowed to be retrofitted with a software update that could enable the activation of their self-driving features. These features would be rolled out through an over-the-air (OTA) software update for vehicles that have already been sold to consumers.

Previous reports have indicated that Tesla Japan has started the testing of FSD technology on public roads. At the time, reports indicated that Tesla Japan employees have been conducting the tests, and the company is planning to release its FSD software to consumers in the near future, at least pending compliance with safety standards and guidelines. 

New guidelines

In a comment on X, former Tesla Board Member Hiro Mizuno explained that the Ministry of Land, Infrastructure, Transport and Tourism Ministry’s decision is no small matter, as it could pave the way for the smooth rollout of features like FSD to Tesla consumers in Japan. 

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“The Ministry of Land, Infrastructure, Transport and Tourism’s decision to allow retrofitting of autonomous driving through software updates is significant. Currently, Tesla is the only manufacturer actively pursuing this, but I had thought that if actual autonomous driving were to begin, it would be impossible to keep up if the approval process had to be repeated for every software update. As a result, this decision will make it easier for all manufacturers to introduce autonomous driving in Japan,” he wrote in a post on X.

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