News
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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Energy
Tesla starts hiring efforts for Texas Megafactory
Tesla’s Brookshire site is expected to produce 10,000 Megapacks annually, equal to 40 gigawatt hours of energy storage.
Tesla has officially begun hiring for its new $200 million Megafactory in Brookshire, Texas, a manufacturing hub expected to employ 1,500 people by 2028. The facility, which will build Tesla’s grid-scale Megapack batteries, is part of the company’s growing energy storage footprint.
Tesla’s hiring efforts for the Texas Megafactory are hinted at by the job openings currently active on the company’s Careers website.
Tesla’s Texas Megafactory
Tesla’s Brookshire site is expected to produce 10,000 Megapacks annually, equal to 40 gigawatt hours of energy storage, similar to the Lathrop Megafactory in California. Tesla’s Careers website currently lists over 30 job openings for the site, from engineers, welders, and project managers. Each of the openings is listed for Brookshire, Texas.
The company has leased two buildings in Empire West Business Park, with over $194 million in combined property and equipment investment. Tesla’s agreement with Waller County includes a 60% property tax abatement, contingent on meeting employment benchmarks: 375 jobs by 2026, 750 by 2027, and 1,500 by 2028, as noted in a report from the Houston Business Journal. Tesla is required to employ at least 1,500 workers in the facility through the rest of the 10-year abatement period.
Tesla’s clean energy boom
City officials have stated that Tesla’s arrival marks a turning point for the Texas city, as it highlights a shift from logistics to advanced clean energy manufacturing. Ramiro Bautista from Brookshire’s economic development office, highlighted this in a comment to the Journal.
“(Tesla) has great-paying jobs. Not just that, but the advanced manufacturing (and) clean energy is coming to the area,” he said. “So it’s not just your normal logistics manufacturing. This is advanced manufacturing coming to this area, and this brings a different type of job and investment into the local economy.”
News
Tesla Giga Shanghai just built its 5 millionth battery pack
The achievement highlights Giga Shanghai’s role as the automaker’s highest volume manufacturing complex.
Tesla’s Shanghai Gigafactory has reached a major production milestone, with its five millionth battery pack rolling off the line this week.
The achievement highlights Giga Shanghai’s role as the automaker’s highest volume manufacturing complex and primary vehicle export hub.
Giga Shanghai’s new milestone
Tesla announced the milestone on X and Weibo, sharing images from the facility where the five millionth pack was completed. Images showed the Giga Shanghai team posing for a commemorative photo with the facility’s five millionth battery pack. Several of the company’s executives congratulated the Tesla China team for its recent milestone, including SVP Tom Zhu, who wrote “Power up, team!” in a post on X.
While Tesla designs and assembles its battery packs in China, the cells themselves are supplied by local partner CATL and South Korea’s LG Energy Solution, as noted in a CNEV Post report. Tesla China has stated that its pack safety standards exceed industry norms several times over, with longevity engineered to outlast vehicle lifespans.
Giga Shanghai’s growing role
Construction of Giga Shanghai began in early 2019, becoming China’s first wholly foreign-owned auto manufacturing facility. Giga Shanghai’s first phase was completed within the year, producing Model 3 sedans by the end of 2019. It now produces both Model 3 sedans and Model Y SUVs for domestic and export markets, with an annual capacity approaching one million vehicles.
Despite the record-setting battery milestone, Tesla China’s recent domestic results left a lot to be desired. As per the China Passenger Car Association, Tesla’s retail sales in October dropped 36% year over year to 26,006 units, the lowest since late 2022. Analysts attributed the decline to Giga Shanghai’s focus on exports last month, as well as the ramp of compelling rivals like the Xiaomi YU7.
News
Tesla confirms upcoming launch of FSD Supervised in South Korea
The announcement came through a post from Tesla Korea’s official account on X.
Tesla has confirmed that it will be releasing its Full Self-Driving (FSD) Supervised system in South Korea. The announcement came through a post from Tesla Korea’s official account on X, which featured a video showing the system navigating local roads in a Tesla Model S sedan.
FSD Supervised in South Korea
The teaser video posted by Tesla Korea showed a vehicle performing lane changes, navigating intersections, and even parking without driver input, all while the driver kept their hands off the steering wheel. The footage was filmed on domestic roads, suggesting that Tesla Korea has been initiating FSD test drives in the country for some time.
Tesla’s FSD software currently exists in two versions: supervised and unsupervised. The supervised version still requires driver attention, while the unsupervised variant, which is being used in the company’s Robotaxi service, allows full autonomy. Tesla has confirmed plans to expand supervised FSD to Europe, and China, as well as markets like Japan, sometime next year.
South Korea’s FSD likely for U.S.-made cars to start
In South Korea, Tesla’s popularity has surged despite FSD not yet being available in the country. This is largely due to the new Model Y, which was launched in April. Thanks to the vehicle’s reasonable price and features, the new Model Y has driven domestic sales up 92.8% year-over-year, securing Tesla’s place among the country’s top imported carmakers.
With FSD, Teslas become significantly more compelling vehicles. Analysts warn, however, that legal and regulatory hurdles could complicate FSD’s local introduction. Over 80% of Teslas sold in South Korea are manufactured in China, and those vehicles must comply with domestic safety standards, as noted in a Chosun report.
Industry experts suggest the first wave of FSD-enabled vehicles will likely be U.S.-made, as models built under the Korea-U.S. Free Trade Agreement automatically meet South Korean safety requirements.
“Since the supervised FSD is a technology that assists driving, its introduction in South Korea is technically feasible. However, potential conflicts with domestic road laws and safety standards are a concern,” one industry insider told local media. “US-made vehicles are not subject to South Korean safety standards due to the Korea-US FTA, making FSD implementation relatively easier, whereas the situation differs for Chinese-made vehicles.
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