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SpaceX delays Starhopper’s first flight a few days despite Raptor preburner test success
SpaceX has (partially) ignited Starhopper’s freshly-installed Raptor engine, successfully verifying that the engine is ready for its next major test: a full ignition and static firing. Although successful, SpaceX still has some work to do before the vehicle is ready for its first untethered flight(s).
July 15th’s progress is just the latest in a several day-series of preflight tests designed to reduce the likelihood that Starhopper is destroyed over the coming days and (hopefully) weeks. If all goes planned during the awkward Starship prototype’s first foray into hover tests, SpaceX CEO Elon Musk has stated that he will provide an official presentation updating the public on the status of the company’s ever-changing next-generation rocket.
The past week or so of Starhopper preflight testing began with Raptor serial number 6 (SN06) completing the last of a series of acceptance test fires in McGregor, Texas on June 10th. Even on its own, this was a major milestone for the new SpaceX engine: Raptor SN06 was the first of the new, full-scale engines to pass the acceptance test program with flying colors. According to Musk, for the engine to complete those tests so successfully, SpaceX had to solve a challenging bug in which some sort of mechanical resonance (i.e. vibration) damaged or destroyed Raptors SN01-05.
Hours later, the engine began a short ~450 mi (720 km) journey south to Starhopper, located in Boca Chica, Texas. The engine arrived on July 11th and was fully installed on Starhopper by the following evening (July 12th), at which point SpaceX put Starhopper and Raptor through some mild but valuable thrust vector controller (TVC) tests, wiggling the car-sized engine to ensure it can accurately steer the prototype rocket.
Around two days after the above ‘wiggle’ test was successfully completed, SpaceX moved into the next stage, partially fueling Starhopper with liquid methane and oxygen propellant and helium pressurant in what is known in rocketry as a wet dress rehearsal (WDR). The (implicitly) successful WDR was capped off with a duo of what can now safely be concluded were some sort of Raptor test preceding even pre-ignition operations. Whatever the tests were, they appear to have been completed successfully.
That appears to be the case because less than 24 hours after their completion, on July 15th, SpaceX once again began loading Starhopper with propellant and pressurant for a second round of wet testing. This time around, SpaceX got right into more critical Raptor tests once enough propellant was loaded, igniting the engine’s interwoven oxygen and methane preburners.

Previously discussed 24 hours ago in a Teslarati article focused on Raptor wiggles and other miscellaneous tests, Raptor is an extremely advanced rocket engine based on a cycle (i.e. how propellant is turned into thrust) known as full-flow staged combustion.
“In a staged-combustion engine like Raptor, getting from the supercool liquid oxygen and methane propellant to 200+ tons of thrust is quite literally staged, meaning that the ignition doesn’t happen all at once. Rather, the preburners – essentially their own, unique combustion chambers – ignite an oxygen- or methane-rich mixture, the burning of which produces the gas and pressure that powers the turbines that bring fuel into the main combustion chamber. That fuel then ignites, producing thrust as they exit the engine’s bell-shaped nozzle.
Unintuitively, conditions inside the preburner – hidden away from view – are actually far more intense than the iconic blue, purple, and pink flame that visibly exists Raptor’s nozzle. Much like hot water will cool while traveling through pipes, the superheated gaseous propellant that Raptor ignites to produce thrust will also cool (and thus lose pressure) as it travels from Raptor’s preburner to its main combustion chamber. If the pressure produced in the preburners is too low, Raptor’s thrust will be (roughly speaking) proportionally limited at best. At worst, low pressure in the preburners can trigger a “hard start” or shutdown that could destroy the engine. According to Elon Musk, Raptor’s oxygen preburner thus has the worst of it, operating at pressures as high or higher than 800 bar (11,600 psi, 80 megapascals).”
In full-flow staged combustion (FFSC), even more complexity is added as all propellant that touches the engine must necessarily end up traveling through the main combustion chamber to eke every last ounce of thrust out of the finite propellant a rocket lifts off with. As such, FFSC engines can be about as efficient as the laws of physics allow any given chemical rocket engine to be, at the cost of exceptional complexity and brutally difficult development.
Additionally, FFSC physically requires two separate preburners and then makes things even harder by making each separate preburner (methane and oxygen) depend on each other’s operation for the engine to fully ignite. This means that no individual preburner can be used to kickstart Raptor – instead, SpaceX must somehow spin the turbopumps that feed propellant into each preburner with some separate system. This is all just to emphasize the fact that Raptor’s ignition sequence is a spectacularly complex orchestra of valves, spark plugs, sensors, and magic. This is why it’s valuable for Raptor to test its preburner system independently of an actual ignition test, at least as long as the engine is still in the development stages.

According to NASASpaceflight.com managing editor Chris Bergin, what this practically translates to is a minor Starhopper hover test delay of 1-2 days, while the static fire has also been pushed roughly 24 hours from July 15th to July 16th. If that full static fire produces lots of happy data, Starhopper could be cleared for a hover test debut attempt as early as Wednesday or Thursday (July 17/18).
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Tesla prepares for full-throttle manufacturing of major product
Tesla has the second quarter of 2026 as its projected start date for Cybercab production. It also plans to launch Semi and Megapack 3 for “volume production” starting next year, which will also be two major contributors to the company.
Tesla is preparing for a full-throttle manufacturing effort of potentially its biggest product in company history, job postings on the company’s website show.
In preparation for its foray into fully autonomous travel, Tesla is gearing up for Cybercab manufacturing with 30 job postings, ranging from repair technicians to manufacturing specialists.
Elon Musk sets definitive Tesla Cybercab production date and puts a rumor to rest
The jobs are all located in Austin, Texas, where the company’s Gigafactory Texas facility is located. This is where Cybercab production is going to take place.
Tesla has made major strides in the Cybercab project over the past few months, including launching the vehicle on the Fremont Test Track in California and conducting crash testing at Gigafactory Texas.
All of these indicate the company is preparing for an imminent production effort of the vehicle, which, as Elon Musk said during last week’s Earnings Call, will be void of a steering wheel or pedals.
Tesla has the second quarter of 2026 as its projected start date for Cybercab production. It also plans to launch Semi and Megapack 3 for “volume production” starting next year, which will also be two major contributors to the company.
Musk spoke in great detail during the Earnings Call last week about Cybercab’s potential to change the grand picture of the automotive market, comparing other vehicles in the Tesla lineup to “a little bit of the horse-carriage thing.”
He said:
“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. For our other vehicles, they still have a little bit of the horse carriage thing going on where, obviously, if you’ve got steering wheels and pedals and you’re designing a car that people might want to go very direct past acceleration and tight cornering, like high-performance cars, then you’re going to design a different car than one that is optimized for a comfortable ride and doesn’t expect to go past sort of 85 or 90 miles an hour.”
Cybercab production is imminent, given the job postings and the company’s proposed timeline for manufacturing to begin. Of course, there is always the potential that Tesla is late to the party, as it has been with other projects.
Elon Musk
xAI’s Grokipedia goes live, gets praise from Wikipedia co-founder
xAI’s latest creation, Grokipedia, has gone live, and even if it’s only at Version 0.1, it is already receiving positive reviews from some users.
xAI’s latest creation, Grokipedia, has gone live, and even if it’s only at Version 0.1, it is already receiving positive reviews from some users. These include Larry Sanger, the co-founder of Wikipedia, the world’s largest online encyclopedia, which has become quite controversial in recent years over accusations of bias.
Grokipedia launches
Immediately after Grokipedia went live, the AI-powered Wikipedia alternative was tested by numerous users. So far, a good number of testers have responded positively to the online encyclopedia, with many observing that Grokipedia does tend to be more neutral than Wikipedia. This was particularly evident in controversial topics, from alternative medicine to events like Gamergate.
Among these users was Larry Sanger, who noted that while Grokipedia still has a lot of areas of improvement, it is already very promising. “My initial impression, looking at my own article and poking around here and there, is that Grokipedia is very OK. The jury’s still out as to whether it’s actually better than Wikipedia. But at this point I would have to say “maybe!” He wrote in a post on X.
Musk responded to Sanger’s comments, stating that the Wikipedia co-founder’s observations are “accurate.” The xAI founder also noted in a separate X post that even in its V0.1 form, Grokipedia is already better than Wikipedia.
Why Grokipedia exists
During an interview on the Tucker Carlson Show, Sanger point out that Wikipedia has become a far cry from his initial vision for the online encyclopedia, and a lot of this was because of the its “Reliable sources/Perennial sources” page, which categories publications and sources into tiers of credibility. Sanger noted that the list leaned heavily left, with conservative publications getting effectively blacklisted in favor of their more liberal.
Musk responded to Sanger’s comments by stating that Grokipedia will be created as a step towards xAI’s broader goal of “understanding the Universe.” He added that Grokipedia, which will use xAI’s Grok, would provide broader sourcing and a freer exchange of information compared to Wikipedia’s current system.
One month after Elon Musk’s comments, Grokipedia has gone live in its V0.1 form.
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Tesla Fremont Factory celebrates 15 years of electric vehicle production
Since opening in 2010, the Fremont Factory has produced all four “S3XY” models while creating tens of thousands of jobs.
Tesla is marking the 15-year anniversary of its Fremont Factory in California, the first automotive mass-manufacturing plant acquired by the electric car maker.
Since opening in 2010, the Fremont Factory has produced all four “S3XY” models while creating tens of thousands of jobs and investing billions of dollars in the region.
Celebrating 15 years of EV production
The Fremont Factory’s milestone was celebrated by the official Tesla Manufacturing account on X, which posted a photo of several Teslas forming a “15” in front of the facility’s iconic white facade. As per the electric vehicle maker, the Fremont Factory has now produced 3.6 million vehicles so far, and it has also created over 20,000 jobs in the state.
“15 years ago, we opened Fremont factory. Today, the Fremont team is producing all 4 S3XY models, totaling 3.6M vehicles made so far. 20k+ California jobs created w/ billions of dollars invested,” the official Tesla Manufacturing account on X wrote in its post.
The Fremont Factory’s transformation
Tesla acquired the Fremont Factory from the defunct NUMMI joint venture between General Motors and Toyota in May 2010 for $42 million. The facility had produced more than 8 million vehicles under GM and Toyota over 26 years. Following its acquisition, Tesla retooled the 5.3-million-square-foot plant to support the production of the Model S sedan.
Over the past 15 years, the factory has evolved into Tesla’s primary North American production hub, assembling the Model S, 3, X, and Y. Annual output has exceeded 550,000 vehicles, including nearly 560,000 produced in 2023 alone. Expectations are high that other products, such as the next-generation Roadster and Optimus, might be produced in the Fremont Factory as well.
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