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SpaceX Starship stacked with ballast for hop test debut

Starship SN4 has been outfitted with a ballast weight to enable its inaugural flight test. (NASASpaceflight - bocachicagal)

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SpaceX has installed a custom-built ballast atop its fourth full-scale Starship prototype, a sign that the company is rapidly approaching the ship’s first Starhopper-style hop test.

Although CEO Elon Musk officially “redirected” SpaceX’s resources away from Starship’s first flight and towards Crew Dragon’s NASA astronaut launch debut, the company continues to work around the clock to ready Starship SN4 for the program’s biggest test yet. Designed with the goal of creating a fully-reusable, ultra-capable launch vehicle that is unprecedentedly affordable, SpaceX’s Starship spacecraft and Super Heavy booster have made impressive progress over the last 12 or so months.

In July and August 2019, Starhopper – a low-fidelity testbed and proof of concept – successfully performed two untethered hop tests, ultimately flying more than 150m (~500 ft) above ground before safely touching down. Three months later, the first full-scale Starship prototype was destroyed almost immediately after its first pressure test began, a failure that lead SpaceX to expedite factory upgrades. Just six months later, SpaceX has completed multiple successful tests, including pressure tests that pushed beyond the pressures needed for safe human spaceflight, several full wet dress rehearsals (WDRs) with live propellant, and three Raptor engine static fires. In fewer words, Starship is ready for its next big test: flight.

SpaceX technicians prepare to complete a jerryrigged ballast weight for Starship SN4. (NASASpaceflight – bocachicagal)

However, Starship SN4 currently has just one Raptor engine installed and will remain in that configuration for its inaugural hop, expected to reach a maximum altitude identical to Starhopper (150m/500ft). The odd configuration means that the rocket will be propelled by asymmetric thrust, as Starship’s ‘thrust puck’ engine section is designed to hold three Raptor engines in a triangular formation. Raptor is capable of producing up to 200 metric tons (~440,000 lbf) of thrust with an unclear level of throttle control (likely mediocre according to comments made by Elon Musk).

Impressively, although it might seem reasonable to assume that Starship SN4 is about as heavy as the ~120 ton Starhopper, the clear and present need to install substantial ballast suggests otherwise. Combined with comments made during SN4’s April 2020 transport from factory to launch site, it appears that even SpaceX’s early Starship engine sections weigh just 50-60 metric tons (110,000-125,000 lb) empty. That weight doesn’t account for the flaps, heat shield, nose section, or many other heavy components that orbital Starships will eventually need but is still impressive.

Starship SN4 was transported to the launch pad on April 23rd. (NASASpaceflight – bocachicagal)
On May 27th, SpaceX installed a massive ballast weight on top of the Starship prototype. (NASASpaceflight – bocachicagal)

That impressive weight reduction, Raptor’s inability to safely throttle low, and the FAA’s lack of interest in dozens (up to hundreds) of tons of explosive propellant flying above or around populated areas poses its own challenges for the first full-scale Starship flight. The addition of ballast helpfully solves (or at least alleviates) several of those issues. Notably, ballast can prevent SpaceX from having to fuel Starship SN4 with dozens of extra tons of explosive propellant to counteract the high thrust of its single engine and permit a safe launch and landing.

At the same time, if Starship SN4’s wet weight is reduced by carrying less propellant during its first flight, that actually exacerbates the problem of Raptor’s small throttle range, as a lighter ship would be much harder to manage as the engine rapidly burns propellant and thus loses mass. With ballast, Raptor won’t have to throttle as low as it would otherwise have to to ensure a gentle rate of deceleration. Built out of sheet steel and two spare rolls of the same steel used to form Starship rings, Starship SN4’s new ballast likely increases its dry mass by some 50% or more (25+ metric tons).

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(NASASpaceflight – bocachicagal)
Starship SN4’s solid steel ballast. (NASASpaceflight – bocachicagal)

Pending Crew Dragon’s inaugural astronaut launch, now scheduled no earlier than 3:22 pm EDT (19:22 UTC), May 30th after weather delayed the first May 27th launch attempt, Starship SN4 has no testing periods on the calendar at the moment. Speaking around May 23rd, Musk stated that the ship was likely at least a “few weeks” away from its flight debut, suggesting that the ship will perform another static fire test to prepare for its first hop as early as next week. Stay tuned for updates as SpaceX’s works towards two very exciting Crew Dragon and Starship milestones.

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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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Jim Cramer chimes in on Tesla CEO Elon Musk’s pay package

“Don’t be small-minded: Tesla is about robots, Full Self-Driving, the future. Give him his package.”

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Credit: The Street

Investor and host of Mad Money on MSNBC , Jim Cramer, has chimed in on Tesla CEO Elon Musk’s pay package and whether it should be rewarded to the frontman or not.

Cramer has drawn a lot of attention regarding his sentiments on Tesla, as investors have routinely given him a pretty hard time over what he’s said about the company.

For the past few years, we have covered his comments on Tesla when he has something to say, mostly because his opinion on the stock seems to change pretty frequently; at a minimum, he has something different to say about it every few months.

However, Cramer knows Musk’s value to Tesla, and said on Thursday that he believes the CEO deserves his pay package:

“Don’t be small-minded: Tesla is about robots, Full Self-Driving, the future. Give him his package.”

Cramer’s comments come just one day after Tesla’s Q3 2025 Earnings Call, where Musk took several opportunities to call out the importance of the pay package and how it could impact the company’s future — with or without him.

Musk said at one point that he would not feel comfortable continuing to develop the company’s massive fleet of Optimus bots without having appropriate control of the company from a voting perspective.

He said he does not want so much power that if he “were to lose his mind,” he could not be removed. However, he does feel he needs to be protected from “activist shareholders,” or “corporate terrorists” like proxy groups Institutional Shareholder Services (ISS) and Glass Lewis:

“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? …It’s just, if we build this robot army, do I have at least a strong influence over that robot army, not current control, but a strong influence? 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.”

At the end of the call, Musk said:

“Like I said, I just don’t feel comfortable building a robot army here and then being ousted because of some asinine recommendations from ISS and Glass Lewis, who have no freaking clue. I mean, those guys are corporate terrorists.”

Cramer is one of many who realize Musk’s importance to Tesla, and how the company would likely lack the guidance and prowess it does without his planning and drive. However, Tesla shareholders will have the ultimate say on November 6 when they vote on Musk’s compensation plan.

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Tesla is stumped on how to engineer this Optimus part, but they’re close

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Credit: Tesla

Tesla has been stumped on how to engineer one crucial part of the Optimus bot, but CEO Elon Musk says the company is “on the cusp” of achieving something great with the project.

During the Q3 2025 Earnings Call, Tesla CEO Elon Musk revealed the company is moving closer to a major breakthrough with the Optimus project, and said they are “on the cusp of something really tremendous.”

However, it seems there is one specific portion of the robot that has truly stumped engineers at the company: the hand, fingers, and forearm.

Musk went into great detail about how incredibly complex and amazing the human hand is, highlighting its dexterity and capability, as its ability to perform a wide variety of tasks is especially impressive:

“I don’t want to downplay the difficulty, but it’s an incredibly difficult thing, especially to create a hand that is as dexterous and capable as the human hand, which is incredible. The human hand is an incredible thing. The more you study the human hand, the more incredible you realize it is, and why you need four fingers and a thumb, why the fingers have certain degrees of freedom, why the various muscles are of different strengths, and fingers are of different lengths. It turns out that those are all there for a reason.”

It’s been pretty apparent that Tesla has made massive strides in the Optimus project, especially considering it has been able to walk down hills, learn things like Kung Fu, and even perform service tasks like serving food and drinks.

However, a recent look at a Gen 2.5 version of Optimus posted by Marc Benioff, the CEO of Salesforce, showed that Tesla was likely using mannequin hands until it developed something that was both useful and aesthetically pleasing:

Musk continued on the call last night that the Tesla team was confronted with an “incredibly difficult” challenge from an engineering perspective, and the hands and actuators for that specific part were tough to figure out:

“Making the hand and forearm, because most of the actuators, just like the human hand, the muscles that control your hand are actually primarily in your forearm. The Optimus hand and forearm is an incredibly difficult engineering challenge. I’d say it’s more difficult than the rest of the robot from an electromechanical standpoint. The forearm and hand are more difficult than the entire rest of the robot. But really, in order to have a useful generalized robot, you do need an incredible hand.”

The CEO continued that developing a useful and effective robot was “crucial to the future of the company,” and that he works with Optimus’s design team each Friday night.

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Elon Musk sets definitive Tesla Cybercab production date and puts a rumor to rest

“The single biggest expansion in production will be the Cybercab, which starts production in Q2 next year.” -Elon Musk

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Credit: Teslarati

Tesla CEO Elon Musk finally set a definitive date for Tesla Cybercab production and, at the same time, put a substantial rumor regarding the vehicle that has been circulating within the community to rest.

Tesla’s Cybercab was unveiled last October as the company’s two-seater, affordable option that would ultimately be the car used for autonomous travel. It was initially slated for production in late 2025 or early 2026.

Tesla is ramping up its hiring for the Cybercab production team

However, Tesla has finally said it will start production of the Cybercab in Q2 2026, a more concrete date for the company, as it has moved the entire project forward in recent weeks by testing it at the Fremont Test Track and conducting crash safety assessments.

Musk said on the Q3 2025 Earnings Call:

“The single biggest expansion in production will be the Cybercab, which starts production in Q2 next year. That’s really a vehicle that’s optimized for full autonomy. It, in fact, does not have a steering wheel or pedals and is really an enduring optimization on minimizing cost per mile for fully considered cost per mile of operation.”

In that quote, Musk also put a rumor that has been circulating within the community to rest. Some started to speculate whether Cybercab would be sold with a steering wheel and pedals, as many of the elements of the car seemed to hint toward not being exclusively autonomous, including side mirrors being equipped, among other things.

It has been interesting to see some consider whether Tesla would sell the vehicle with the elements that would enable human control, especially as there have been a handful of images of the vehicle on company property with a steering wheel spotted.

However, Musk doubled down on the autonomous nature of the Cybercab with this confirmation during the earnings call, something that many investors likely wanted to hear because it was, in a way, a vote of confidence for the company’s path to autonomy.

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